巴西专利BR102016014195B1 method of generating a design for a dental restoration product, computer aided design system and ope

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专利摘要:
GENERATING A DESIGN FOR A DENTAL RESTORATION PRODUCT FROM DENTAL IMAGES The present invention relates to a technology that is described to generate a design for a dental restoration product from one or more dental images of a patient. The method may include obtaining a three-dimensional (3D) image of the patient's dentition prior to a change in the patient's dentition; and then determine the change in the patient's dentition. A design of a dental restoration product can be generated automatically for at least one patient's tooth based on a 3D dentition image before the dentition change. Various other computer-implemented methods, systems, and means capable of being read by a computer are also described.
公开号:BR102016014195B1
申请号:R102016014195-8
申请日:2016-06-17
公开日:2020-12-08
发明作者:Sameer Anand Joshi
申请人:Dental Imaging Technologies Corporation；
IPC主号:

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FIELD OF THE INVENTION
[0001] Modalities of the present invention refer to the manufacture of dental prostheses. More particularly, the modalities of the present invention refer to the capture and storage of dentition images for the design and manufacture of restorations (for example, dental prostheses) using three-dimensional printing ( 3D) and other manufacturing techniques. BACKGROUND
[0002] Certain intraoral imaging systems allow a dental technician to generate a 3D image of the patient's mouth and display the topographic characteristics of a tooth on a computer screen monitor. The 3D image can take the form of a point cloud in a coordinate system fixed in 3D space. A surface can be adapted to the said point cloud to generate a topographic map of the soft and rigid tissues within the patient's mouth. Intraoral imaging devices can use various non-ionizing radiation (for example, simple light and laser radiation) to create a point cloud or surface data from the patient's dentition.
[0003] Conical beam computed tomography (CBCT) involves the use of a rotating CBCT reader portal combined with algorithms or software in an image processing system to generate images of teeth and the surrounding bone structure and soft tissues. The CBCT reader uses high-energy radiation (for example, X-ray radiation) to generate a 3D image of the patient. SUMMARY
[0004] In one embodiment, the present invention provides a method for generating a design for a dental restoration product from one or more dental images of a patient. The method includes the step of obtaining a 3D image of the patient's dentition before a change in the patient's dentition. The step of determining the change in the patient's dentition is as follows. The next step in the method is to automatically generate a design of a dental restoration product for at least one patient's tooth based on at least one 3D dentition image before the dentition change. The automatic generation of the dental restoration product design uses a processor. The method can be executed as instructions on a machine, where instructions are included at least on a medium capable of being read by a computer or a storage medium capable of being read by a non-transitory machine.
[0005] In one example, the step of determining the change in the patient's dentition includes obtaining a 3D image after the patient's change after the change in the patient's dentition, and the generating step additionally includes generating the drawing based on at least one difference between the dentition 3D image before the dentition change and the 3D image after the change. The method may additionally include the step of making the dental restoration product based on the design. The step of obtaining a 3D image of the patient's dentition is performed in a dental treatment office. The step of manufacturing the dental restoration product may additionally include sending the design to a fabrication device, and fabricating the dental restoration product using the design-based fabrication device. The manufacturing device may include a milling machine or an additive manufacturing device located in the dental treatment office. The additive manufacturing device can use stereolithography, 3D printing, or 3D printing based on digital light processing.
[0006] In another example, the step of obtaining a 3D image of the patient's dentition includes acquiring an image of the dentition from an imaging device where the imaging device includes an intraoral imaging device. Obtaining the 3D dentition image may include the use of a non-ionization reader. The non-ionization reader can include an optical reader or a laser reader. The intraoral image can include a stereolithography file or another type of surface geometry file. Alternatively, obtaining a 3D image of a patient may include acquiring a volumetric dental image of the patient using X-ray imaging, which includes, but is not limited to CBCT, other types of computed tomography (CT), volumetric tomography (VT), or any other suitable volumetric imaging method known in the art. Images can be obtained using other techniques or modalities that include, for example, magnetic resonance imaging (MRI) or ultrasound imaging.
[0007] In yet another example, the step of obtaining the patient's 3D dentition image additionally includes (1) acquiring an intraoral image of the patient using a non-ionization reader; (2) determine the surface of the crown portion for a tooth above a periodontium based on the intraoral image; (3) acquire a volumetric dental image of the patient using X-ray technology; (4) determine the tooth tissue geometry for the tooth that includes at least a portion of the root tissue surrounded by the periodontium based on the volumetric dental image; and (5) generate the 3D dentition image that includes the surface of the crown portion and at least a portion of the root tissue based on a combination of the intraoral image and the volumetric dental image using an iterative closest point process (ICP) ) or a 4 point decongruent set process (4PCS).
[0008] The drawing can include a computer-aided drawing format file (CAD format) or an image file. The dental restoration product can include a dental prosthesis, a denture, an implant, an inlay, a filler, a tampon, a crown, an onlay, or a varnish. In another example, the method may additionally include the step of storing, on a data storage device, the patient's 3D dentition image prior to the dentition change in a custom library associated with the patient.
[0009] In another example, the method includes segmenting the patient's 3D dentition image to generate crown data for a tooth; process the crown data to generate a crown design file; and store the crown design file in a custom library associated with the patient. In one configuration, the step of generating the dental restoration product design for at least one patient's tooth includes obtaining the crown design file from the custom library; and generate the dental restoration product design based on the crown design file. In another configuration, the step of obtaining a 3D image of the patient's dentition additionally includes obtaining a pre-trauma design file previously saved in the custom library of a data storage device before damage to a tooth occurs. The step of determining the change in the patient's dentition additionally includes obtaining a post-trauma design file saved in the custom library after damage has occurred to the tooth.
[0010] The step of generating the design of the dental restoration product for the patient's tooth additionally includes comparing the pre-trauma design file and the post-trauma design file for the tooth. A dental restoration product file is generated based on a comparison between the pre-trauma design file and the post-trauma design file. The dental restoration product file may include tooth tissue present in the pre-trauma design file, but missing from the post-trauma design file. In another configuration, the step of segmenting the patient's 3D dentition image additionally includes differentiating between tooth tissue and nonwoven tooth in a 3D dentition image; and generate the tooth crown data based on the tooth tissue in a 3D teething image.
[0011] In another example, the method may additionally include the step of preparing a tooth for restoration after the step of obtaining a three-dimensional image of the patient's dentition before the dentition change and before the step of determining the dentition change. The step of preparing the tooth for restoration causes the dentition to change. The step of determining the dentition change additionally includes obtaining the 3D image after the patient changes.
[0012] In another embodiment, the present invention provides a computer aided dental design (CAD) system having a computing circuit (for example, processor or controller) configured to generate a design for a dental restoration product from one or more dental images of a patient. The computer circuit is configured to obtain a 3D image of the patient's dentition before a change in the patient's dentition; determine the change in the patient's dentition; and automatically generating a design of a dental restoration product for at least one patient's tooth based on the change in the patient's dentition and the 3D dentition image before the dentition change.
[0013] In one example, the computing circuit is configured to implement the methods previously described. For example, the computer circuit can be configured to obtain the 3D image after changing the patient after the change in the patient's dentition, and generate the drawing based on at least one difference between the 3D image of the dentition before the change in the patient's dentition. teething and the 3D image after the change. The computing circuit can be further configured to manufacture the dental restoration product based on the design. In another example, the computing circuit is additionally configured to acquire the 3D dentition image from an imaging device that comprises an intraoral imaging device or a volumetric dental imaging device.
[0014] In another embodiment, the present invention provides a system capable of being operated to generate a design for a dental restoration product from one or more dental images of a patient. The system can include an imaging module and a design module. The imaging module can be configured to generate and / or obtain a 3D image of the patient's dentition prior to a change in the patient's dentition. The design module can be configured to determine the change in the patient's dentition, and automatically generate a design of a dental restoration product for at least one patient's tooth based on a change in the patient's dentition and the 3D image of teething before the dentition change.
[0015] In one example, the system can be configured to implement the method previously described. For example, the imaging module can be additionally configured to obtain a 3D image after the patient's change after the patient's dentition change, and the design module can be additionally configured to generate the design based on at least one difference between the dentition 3D image before the dentition change and the 3D image after the change. In another example, the system includes a manufacturing device for manufacturing the dental restoration product based on the design. The manufacturing device can include the milling machine or an additive manufacturing device. In another example, the system includes an image acquisition device to acquire or generate a 3D dentition image. The imaging device may include an intraoral imaging device or a volumetric dental imaging device. In another configuration, the system includes a storage device (for example, volatile or non-volatile memory) to store the patient's 3D dentition image prior to the dentition change in a custom library associated with the patient.
[0016] Other aspects of the present invention will become apparent upon consideration of the detailed description and attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 illustrates a system for generating a design for a dental restoration product from a personalized library of one or more dental images of a patient using a segmentation module.
[0018] Figure 2 illustrates a system for generating a design for a dental restoration product from a personalized library of one or more dental images of a patient.
[0019] Figure 3A illustrates the intraoralque optical reading imaging including surface data and / or point cloud data.
[0020] Figure 3B illustrates segmented data of an overlapping crown on an intraoral optical reading image.
[0021] Figure 4 illustrates volumetric imaging from a reading of a cone beam computed tomography (CBCT).
[0022] Figure 5 is an example of a flow chart that illustrates a method for creating a custom library of one or more dental images of a patient.
[0023] Figure 6 is a block diagram that illustrates an example of an inlay design using the patient-specific custom anatomy library.
[0024] Figure 7 is a flow chart that illustrates an example of a method for generating a design for a dental restoration product from one or more dental images of a patient. DETAILED DESCRIPTION
[0025] Before any modalities of the present invention are explained in detail, it should be understood that the present invention is not limited in its application to the details of construction and the arrangement of components determined in the following description or illustrated in the drawings below. The present invention is capable of other modalities and can be practiced or carried out in various ways. The same reference numbers in the different drawings represent the same element. The numbers provided in flow charts and processes are provided for the sake of clarity. which illustrate the steps and operations and do not necessarily indicate a particular order or sequence.
[0026] The modalities of the present invention refer, among other things, to a method and system for the capture and storage of imaging of the patient's intraoral dentition and the use of said computer aided design systems of 3D images and manufacturing systems computer aided (CAD / CAM) for rapid design and manufacture of dental restoration product (eg, a dental prosthesis) using 3D printing or additive manufacturing. The modalities of the present invention also refer to a fused intraoral reading and CBCT imaging for an integrated design of implant and restoration planning. Teething belongs to the teeth and is available in the mouth.
[0027] Combining a restoration design system (which includes software) with an intraoral optical reader allows a dentist to design various types of restorations, which include, but are not limited to, dental prostheses, dentures, implants, inlays, fillings, caps, onlays, crowns, and varnishes. Dental prosthesis is used to restore (for example, reconstruct) intraoral defects, which include, but are not limited to, lack of teeth, lack of parts of teeth, and lack of soft or hard structures of the jaw or palate. Dentures (also referred to as false teeth) are prosthetic devices built to replace missing teeth. Dentures are supported by the soft and hard tissues surrounding the oral cavity (ie, mouth). A dental implant is a surgical component that interfaces with the jaw bone or skull to support the dental prosthesis, which includes, but is not limited to, a crown, bridge, denture, facial prosthesis; or to act as an orthodontic anchor. An inlay is an indirect restoration (for example, a filler) that includes a solid substance (for example, metal, porcelain, or a cured composite resin) formed to fit into a cavity in a tooth and it is cemented in place. A dental filler is a dental restoration material used to restore the function, integrity, and morphology of the missing tooth structure. Buffer (for example, a collagen plug) is a material that can be used to fill a socket (for example, hole) in a jaw bone (for example, when a tooth is extracted). An onlay is similar to an inlay, except that an onlay incorporates a replacement for a tooth cusp by covering the area where the cusp gap would be. Crowns (as a dental prosthetic device) are a type of onlay that completely covers the surfaces of a tooth. A veneer is a thin layer of material placed over a tooth to enhance a tooth's aesthetics or to protect the tooth's surface from damage.
[0028] As a first step in the restoration design process, a dentist uses an intraoral imaging device (112 in figure 1; for example, optical reader) to acquire an image of the patient's dentition from which a fingerprint or a digital model of the patient's dentition can be produced. Digital intraoral imaging devices allow the storage of reading data in a digital format (for example, an open STL format or a proprietary format). STL (Stereolithography) is a file format native to stereolithography CAD software created by 3D imaging systems. However, other types of surface geometry file formats can be used. The digital data is then imported into 3D CAD software. Digital data provides the basic structure from which the dentist can design a specific restoration prosthesis for the case. The 3D CAD software system can include several libraries of crown or tooth designs that are classified based on position, age, or gender. CEREC (Coupled to the Economical Restauration of Esthetic Ceramics or Ceramic Reconstruction chair) and Compass are some examples of commercial 3D CAD software that use crown image image libraries. The crown can refer to the anatomical area of a tooth above the periodontium. The crown is usually covered by the enamel. The periodontium refers to the specialized tissues that surround and support the teeth, which keep the teeth in the maxillary and mandibular bones (mandible).
[0029] Based on the analysis of the patient's dentition, a stock of drawings from the library can be recommended and selected by the software system as a starting point or the stock design can be manually selected by the dentist based on his experience. The said stock design selected from the library can then be modified by scaling, stretching, or similar operations, performed in the 3D CAD software, in order to modify the stock library model to adapt to the patient's anatomy. The occlusion surface can be designed manually by the dentist (using the tools provided in 3D CAD software) or automatically by the software based on a computer algorithm. Computer generated surfaces may not be optimal and may need to be modified by the dentist to ensure the shape and function for a particular patient. The occlusion surface is the surface of a tooth that can make contact with other teeth, which includes, but is not limited to, the contact made between the upper teeth (ie, jaws) ) and the lower teeth (ie, mandibular).
[0030] The process of selecting a design from stock, modifying that design for a restoration prosthesis, adjusting the design of the restoration prosthesis for manufacture by a restoration specialist (for example, dentist or dental technician) can take more than 12 to 15 minutes to complete. During this time of designing the restoration prosthesis, the patient may have to wait (in the dentist's chair). Minimizing the time it takes to design the restoration prosthesis can improve the workflow in a dental office and increase patient satisfaction with the dental procedure. In addition, the computer-generated occlusion surface based on the drawing in the stock may not be a close match for the patient's natural tooth anatomy, causing some qualitative “biting sensation” items that may need to be corrected by the dentist.
[0031] CAD / CAM systems can also use a fabrication device using a grinding process or additive fabrication process to manufacture the restoration prostheses. Such computer-controlled grinding machines and additive-making device can be expensive and require careful maintenance (for example, having high maintenance costs). In addition, the matrices of material (for example, gold, silver, porcelain, or resins) used to manufacture the prosthesis can be relatively expensive, which makes the cost of the dental prosthesis high for the dentist, whose cost is generally passed on to the dentist. the patient.
[0032] Advances in additive manufacturing technologies (for example, 3D printing) and biocompatible resin materials allow the manufacture of complex shapes (for example, dental prostheses). Said manufacturing processes (for example, using a relatively low cost, small size, desktop 3D printing machines) and materials (for example, higher density resins) can be used for the manufacture of restoration prostheses using technologies manufacturing additives (eg 3D printing) that have sufficient strength to be used as a temporary long-term dental restoration product. Higher strength materials, which can be used to manufacture permanent restoration prostheses using additive manufacturing techniques, are also being developed. Due to the nature of minimal additive manufacturing materials, a loss can occur during the manufacturing process, which can potentially provide a material cost advantage over the use of a grinding technique for the manufacture of the prosthetic device. In-office fabrication refers to fabrication performed in a dental treatment office instead of a design for a dental restoration product being sent out of the field to a dental laboratory for fabrication. In-office fabrication can enable the dentist to design and manufacture a dental restoration product during a treatment session (ie consultation).
[0033] Instead of using drawings in stock from a CAD / CAM system library and modifying those drawings in an attempt to match the patient's tooth profile to create a dental restoration product, the patient's own 3D images ( for example, optical image) can be used to automatically generate a design of a dental restoration product. As used in this description, the term "automatic" or "automatically" refers to a process of generating a design based on a teething image without input information or additional user commands. For example, figure 1 illustrates a restoration design and manufacturing system 100 that can be used to design and manufacture a dental restoration product. System 100 includes an image processing system 120, a manufacturing device 150, and an interface device 160 (e.g., computer, laptop computer, monitor, keyboard and / or mouse). The interface device 160 can be used by the dentist to make selections, view 3D images, manipulate and make changes to the design and / or other functions related to the design and manufacture of the dental restoration product.
[0034] The image processing system 120 may include circuit elements, software, computer hardware, components and / or modules to generate a design for a dental restoration product. The image processing system 120 may also include or may be coupled to a manufacturing device 150 (e.g., milling machine or additive manufacturing device) and / or an interface device 160, which includes, but is not limited to to a computing device, an output device (eg, monitor for displaying drawings and images) and / or an input device (eg, keyboard or mouse). In one example, the image processing system 120 together with the manufacturing device 150 can be provided in a dental practice. In such situations, the image processing system 120 and the manufacturing device 150 can be referred to as a manufacturing and restoration design system coupled to chair 100 or 200.
[0035] The image processing system 120 may include an image acquisition device 110, storage device 130, and a CAD device 140. Image acquisition device 110 may be one of a number of different devices or two or more devices used in combination. In one example, image acquisition device 110 includes an intraoral imaging device 112 and / or a volumetric dental imaging device 114. Image data from image acquisition device 110 is provided to storage device 130 and / or the CAD 140 device.
[0036] The storage device 130 can include one or more patient files 132. Each patient file includes one or more 3D dentition images of patient 134 and / or a CAD format library of patient 136. The CAD format library 136 can include crown data 138 for one or more teeth. Storage device 130 may include volatile or non-volatile memory or storage elements, and may be either at the dentist's office or remote location (e.g., cloud storage).
[0037] The CAD device 140 may include a processor 142, an imaging module 144, a segmentation module 146, and a design module 148. The components of the manufacturing and restoration design system 100, which includes the process processing system images 120 and / or the manufacturing device 150, are described in greater detail in relation to the design of the dental restoration product.
[0038] To generate a design of a dental restoration product using the patient's own 3D images, the system 100 obtains the 3D images of the patient, for example, before an event or trauma that causes the desire for the dental restoration product. For example, during a routine dental check-up (for example, every five years as part of a series of intervals across the mouth) the image acquisition device 110 is used to obtain 3D images of dentition 134, which they are then used to form a new (or update an existing) patient file 132 for storage in storage device 130. Figure 3A illustrates an intraoral optical image, which is an example of 3D images of dentition 134.
[0039] In some cases, patient file 132 for a particular patient includes one or more 3D images of dentition 134. In some cases, in addition to 3D images of dentition 134, the CAD format library for patient 136 is included in the patient file 132. In order to generate the CAD format library of patient 136, in some modalities, the imaging module 144 obtains 3D dentition images of patient 134 from patient file 132 or image acquisition device 110. Then, the 3D dentition images of patient 134 are segmented by a segmentation module 146 into individual crowns (310A-E of figure 3B) and stored in a digital format (for example, CAD format files or STL files) as the files of crown data 138 in patient file 132. The set of digitally formatted crown data files 138 can then provide a personalized anatomy library for the patient (e.g., patient CAD format library 1 36), which can be used at some subsequent time as a matrix to generate a dental restoration product.
[0040] If and / or when the patient needs a restoration prosthesis built for a treatment option, a design module 148 of the image processing system 120 can recommend an initial design based on the patient's own custom anatomy library ( for example, patient's CAD format library 136) or the dentist can select the initial drawing from the patient's custom anatomy library based on the position of the tooth. Said initial design can be a very close match to the desired restoration prosthesis in terms of size, spaces and perspective of the occlusion surface design since the initial design is based on the patient's dentition before a change in that dentition. As a result of close correspondence, the initial design may have less manipulation by the dentist to generate a finished design. Less manipulation can reduce the design time for the final restoration prosthesis and provide a better adaptation to the patient, compared to the manipulation of a design in stock or a generic crown shape adapted to the patient's anatomy.
[0041] Said restoration prosthesis designed in the office can be sent from design module 148 to manufacturing device 150 as a design file. The design file provides a digital representation of the dental restoration product that is usable by a manufacturing device 150 to generate the physical dental restoration product. The restoration prosthesis can be manufactured attached to the chair using one or more of the available additive manufacturing techniques, which include, but are not limited to, stereolithography (SLA), 3D printing, and 3D printing based on a digital light processor (DLP). SLA and DLP can use a photopolymerization process, which produces a solid part (for example, dental restoration product) from a liquid photopolymer. Other 3D printing technologies include extrusion deposition, bonding of granular materials, and lamination. 3D printers and materials, which include, but are not limited to, those provided by Envision TEC or DWS systems, can be used to manufacture long-term temporary contracts. The manufacturing device 150 can use any other dental manufacturing process in the dental office or far from the dental office. Although the design for the dental restoration product can be performed using the manufacturing device 150 located in the dental treatment office, the design for the dental restoration product can also be submitted (for example, via the Internet, another computer network to a secure server, or mail using an electronic means) to another facility to manufacture the dental restoration product using any type of dental manufacturing process (eg, grinding machine).
[0042] Various benefits can result from the use of the design for the dental restoration product based on the patient's own personal 3D images. For example, the workflow used to create the design can be improved by reducing the amount of time required to design the final restoration, which can reduce the expected time the patient waits in the dentist's chair. Another benefit is the improved shape and adaptation of the final restoration by using the patient's anatomy for the occlusion surface, which can help maintain the patient's natural bite pattern (for example, touch points and surface-to-surface spaces) and so it can increase patient comfort and acceptance for the design. In addition to the improved occlusion surfaces, anterior computation of the mesial and distal surface profiles and adjacent dental spaces based on the patient's read anatomy can increase the fit of the restoration.
[0043] Figure 2 illustrates another embodiment where the 3D dentition image of patient 134 can be obtained using the image acquisition device 110 of the image processing system 220. The 3D dentition image 134 obtained before a change in dentition can be stored in storage device 130 with patient file 132. If and / or when the patient needs dental restoration product, 3D dentition image 134 can be obtained from imaging module 144 and used as a basis for the design of the dental restoration product. Design module 148 can recommend an initial design based on the 3D dentition image 134 obtained before a dentition change and the required type of dental restoration product, or the dentist can select the initial design based on an image of 3D dentition 134. The CAD device 240 used to generate the design for the dental restoration product may include a processor 142, the imaging module 144, and the design module 148. The storage device 130 may include one or more files patient 132. Each patient file includes one or more 3D dentition images of patient 134.
[0044] In one example, the dentist can determine that a dentition change has occurred and select the type of dental restoration product based on a visual inspection of the patient's mouth. In another example, the image acquisition device 110 can be used to obtain the 3D teething image 134 after a dentition change, and design module 148 can recommend a type of dental restoration product based on a comparison between the 3D image after the patient's change after the dentition change and the 3D image before the patient's change before the dentition change. Design module 148 can generate the design for the dental restoration product based on at least one difference between the 3D image prior to the change and the 3D image after the change. For example, design module 148 can compute the volumetric shape or space defined by the space or difference between the surfaces before the change and after the change in one or more teeth, and can generate an initial restoration design that is formed to fill that one. The 3D image after the change and the 3D image before the change are examples of a 3D teething image 134.
[0045] In another embodiment, a volumetric dental image, which includes, but is not limited to, a CBCT 400 reading in figure 4, can also be used to generate the design for the dental restoration product. The volumetric dental image can be obtained from a volumetric dental imaging device 114 and is another example of the 3D dentition image of the patient 134. For example, during volumetric dental imaging, the volumetric dental imaging device 114 (for example, the CBCT reader) revolves around the patient's head, obtaining multiple distinct two-dimensional (2D) images. A single rotation (for example, typically up to 200 degrees for non-displacement readings, or 360 degrees or more for displacement readings) of the volumetric dental imaging device 114 over the region of interest (for example, the patient's head) acquires a volumetric data set that includes multiple 2D digital images. Computing circuit (eg software), volumetric dental imaging device 114, or image processing system 120 or 220 collects data from 2D digital images, reconstructs the data, and generates a digital volume composed of three-dimensional voxels of anatomical data that can then be manipulated and visualized with the image processing system 120 or 220 (for example, CAD / CAM system). A voxel represents a value in a regular grid in a three-dimensional space. For example, the term voxel is a combination of pixel and volume.
[0046] Volumetric imaging of a patient's tooth can be received on a computing device (eg, image processing system 120 or 220, image acquisition device 110, or CAD device 140 or 240) similar to the computing device used for intraoral imaging process. The mode for generating a volumetric image may include X-ray imaging (for example, CBCT), MRI, or ultrasound imaging. Unreconstructed volumetric data that includes multiple 2D digital images from a multidirectional reading is another example of the patient's 3D dentition image 134.
[0047] Volumetric dental images and intraoral images can show different characteristics and can have different resolutions. For example, intraoral images can provide full crown data, which can be merged with the volumetric images showing the characteristics below the crown. In addition, intraoral images obtained using the intraoral imaging device (for example, an intraoral reader) may have significantly higher accuracy compared to volumetric images, which include, but are not limited to, those obtained using CBCT technology. Therefore, intraoral images alone may be suitable in the design of many dental restoration products. But, in some scenarios, intraoral images may not show all the features necessary to generate the dental restoration product design. Thus, in some cases the combination of intraoral images with volumetric images of the patient's dentition or anatomy can be used to generate a better design of the dental restoration product than using the intraoral images alone or the intraoral image in combination with a drawing on the stock for a feature below the crown that is not responsible for the patient's specific dentition or anatomy.
[0048] The image processing system 120 can be used to record elements from the intraoral image previously obtained (for example, available from patient file 132 read a priori) with corresponding voxels of the volumetric image using any algorithm to combine the same characteristics from at least two different images or types of images, which include but are not limited to an ICP process, a 4PCS process, some other ICP or 4PCS variant, and / or other point adjustment registration processes. The point adjustment record, also known as point matching, is the process of finding a spatial transformation that aligns two point adjustments in a globally consistent model. ICP is an algorithm used to minimize the difference between two point clouds (for example, voxels). In the ICP algorithm, a point cloud, the reference or target, is kept fixed, while in another point cloud, the source is estimated (for example, using a mean square error (MSE) function) and transformed to better match reference. The ICP algorithm iteratively reviews the transformation (combination of translation and rotation) necessary to minimize the distance from the source to the landmark cloud. 4PCS is a fast and robust alignment scheme for 3D point adjustments that uses wide bases, which are known to be flexible to noise and outliers. The 4PCS algorithm allows the recording of untreated noise data, which can be contaminated with outliers, without pre-filtering or smoothing the data. 4PCS can significantly reduce the number of iterations or tests used to establish a reliable record between the underlying surfaces in the presence of noise, without any assumption about the initial alignment. 4PCS can extract the adjustments of 4 coplanar points from a 3D point adjustment that are approximately congruent, under rigid transformation, to a given set of 4 coplanar points.
[0049] A benefit of combining intraoral imaging and volumetric imaging may include treating a patient who has lost a tooth completely or a portion of a tooth and where the treatment plan includes an implant with the placement of an artificially based tooth in the field without tooth (ie, toothless field or the field without the tooth). Volumetric imaging can provide details not shown in the intraoral image. The availability of the intraoral image of the patient's anatomy can be used by the 120 or 220 image processing system to make an initial recommendation of the shape and size of the crown to the dentist using treatment planning software (eg CAD / CAM) in the restoration design and manufacturing system 100 for an integrated implant planning approach with consideration for the restoration design. Intraoral imaging can be of limited use if the patient has a malocclusion worse than class II at the time when intraoral imaging was generated.
[0050] Figure 5 illustrates an example of flow 500 using not only intraoral imaging, but also volumetric imaging. In an initial step 510, a 3D dentition image of the patient 134 is in the form of an intraoral image of the patient's anatomy is acquired through the image acquisition device 110. In a next step 520, the intraoral imaging can be recorded with volumetric imaging (another 3D dentition image of patient 134 previously saved or recently acquired) via imaging module 142, if volumetric imaging is available. If volumetric imaging is available, intraoral imaging can be combined with volumetric imaging using a point adjustment registration process (for example, ICP or 4PCS). In another step 530, crown data 138 can be obtained by segmenting the intraoral imaging derived from the registered intraoral imaging and the volumetric imaging. In the next step 540, the CAD / CAM device 140 or 240 can process the crown data 138 to generate a custom anatomy library (that is, specific to the patient) for use at a later time should the need arise. In another step 550, the original (ie, raw) intraoral image and crown data 138 can be saved on a storage device 130 (for example, on a local computer system or securely on a remote server) to a specific library patient (eg CAD formatted library for patient 136) or patient file 132. In the next step 560, the process can be repeated when re-reading the patient at a later time when or if clinically significant changes are detected in the anatomy (eg, teething). Then, a design file can be generated and / or a dental restoration product can be manufactured based on intraoral imaging and crown data 138 as previously described.
[0051] In other modalities, the design of the dental restoration product can be generated from a 3D dentition image based on the volumetric image alone without using an intraoral image.
[0052] In another example, the intraoral image (either before a dentition change or after a dentition change) can be generated from a plurality of intraoral images using a point adjustment registration process (for example, ICP or 4PCS), or the volumetric image (either before a dentition change or after a dentition change) can be generated from a plurality of volumetric images using a point adjustment registration process (for example, ICP or 4PCS) . For example, multiple intraoral images can be obtained at different times (for example, multiple check-ups). 3D images (for example, intraoral images and / or volumetric images) can be combined to generate an intraoral composite image that represents sudden changes in dentition over time or can correct reading errors or noise, and can provide a 3D image with greater precision. Alternatively, the last 3D image before a significant dentition change (where a dental restoration product is recommended) can be used as a basis for the design of the dental restoration product since the last 3D image may show recent simple wear and teething tear.
[0053] Figure 6 illustrates another modality 600 where a 3D image (for example, optical imaging) can be used to generate a dental restoration product (for example, an inlay). For example, during routine dental check-up (for example, which occurs every 25 years), the patient's crown data is obtained which captures the original shape of tooth A using the image acquisition device 110 (for example, example, an intraoral reader 112) as shown in step 610. The intraoral images thus obtained can be segmented by means of a segmentation module 146 into individual crowns and stored as digital 3D image files (for example, STL files) on the imaging device. storage 130 of the image processing system 120. Said set of digital 3D image files can provide a personalized anatomy library for the patient.
[0054] If or when the patient needs treatment (for example, construction of an inlay), the dentist can do the reading, using the image acquisition device 110, the specific tooth or prepared for the treatment that captures the shape of the tooth prepared B (which represents the same tooth as the patient with the reading of the original format saved from the tooth), as shown in step 620. The specific tooth for which the inlay has to be built can be segmented using segmentation module 146 from the total dentition reading. Said segmented tooth (for example, prepared tooth) can then be registered or compared with the segmented digital representation of the same tooth (ie, the original shape of tooth A) from the patient's custom anatomy library previously created using the CAD device 140, as shown in step 630. A point adjustment registration process (for example, 4PCS or ICP algorithm) can be used for the registration of two sets of data.
[0055] The CAD / CAM software of the image processing system 120 can then use the patient's own personalized anatomy library for the design of the inlay to be manufactured. Boolean operations (for example, subtraction of the 3D CAD / CAM model of the tooth shape prepared from the 3D CAD / CAM model of the original healthy tooth shape (ie A - B) to compute the volumetric shape or the space between the original tooth shape A and tooth shape after preparation B) can provide a design near the end of the inlay with an occlusion surface similar to the patient's natural tooth design, as shown in step 640. The initial design can then be modified using tools (for example, digital waxing tools) in 3D CAD / CAM software as desired, as shown in step 650. Digital waxing allows the dentist to fine-tune a drawing by adding or removing material (for example , wax) as needed. Boolean operations and / or modifications of step 650 can be performed by design module 148.
[0056] Then the design file (for example, STL file) for the dental restoration product can be manufactured by a manufacturing device 150 (for example, 3D printer), as shown in step 660. The manufacturing device can be located in a dental office (for example, where the design is generated) or in another location away from the dental office. Manufacturing device 150 may use a milling machine or additive manufacturing device where the additive manufacturing device uses an additive manufacturing technique, which includes, but is not limited to, stereolithography, 3D printing, or printing in 3D based on DLP. In another example, method 600 of figure 6 can be performed using other hardware and / or components of the manufacturing and restoration design system 100 as well.
[0057] Another example provides a method 700 to generate a design for a dental restoration product from one or more dental images of a patient, as shown in the flow chart in figure 7. The method includes the step of obtaining a 3D image of the patient's dentition before a change in the patient's dentition, as in step 710. The step of determining the change in the patient's dentition follows, as in step 720. The next step in the method is to automatically generate a product design dental restoration for at least one patient's tooth based on at least one 3D dentition image prior to the dentition change, as in step 730.
[0058] In another example, the method may additionally include sending the design in the form of a design file to a fabrication device and then fabricating the dental restoration product based on the design file, as previously described.
[0059] Various techniques, or certain aspects or portions thereof, may take the form of a program code (ie instructions) embedded in a tangible medium, which includes, but is not limited to floppy disks, read-only memory compact disc (CD-ROMs), hard drives, non-transitory storage medium capable of being read by computer, or any other storage medium capable of being read by machine where the program code is loaded and executed by a machine (for example, the computer) the machine becomes a device for practicing the various techniques. Circuit elements (eg, computer circuit) may include hardware, firmware, program code, executable code, computer instructions, and / or software. A non-transitory storage medium capable of being read by a computer can be a storage medium able to be read by computer that does not include signal. In the case of program code running on programmable computers, the computing device may include a processor, a storage medium capable of being read by the processor (which includes volatile and non-volatile memory and / or storage elements), at least one device input, and at least one output device. Volatile and non-volatile memory and / or storage elements can be random access memory (RAM), programmable erasable read-only memory (EPROM), flash drive, optical drive, magnetic hard drive, solid state drive, or another means for the storage of electronic data. One or more programs that can implement or use the various techniques described here can use an application programming interface (API) interface, reusable controls, and the like. These programs can be implemented in a high-level procedure or object-oriented programming language to communicate with a computer system. However, the program (s) can be implemented together or in machine language, if desired. In any case, the language can be a compiled or interpreted language, and combined with hardware implementations.
[0060] It should be understood that many functional units described in the present specification have been marked as modules, in order to more particularly emphasize their implementation independence. For example, a module can be implemented as a hardware circuit comprising very large-scale integration circuits (VLSI) or gate structures, off-the-shelf semiconductors, which include, but are not limited to, logic chips, transistors, or other distinct components. A module can also be implemented on programmable hardware devices, which include, but are not limited to programmable door frames, programmable frame logic, programmable logic devices or the like.
[0061] The modules can also be implemented in software for execution by various types of processors. An identified executable code module can, for example, comprise one or more physical or logical blocks of computer instructions, which can, for example, be organized as an object, procedure, or function. However, the executable code of an identified module does not need to be physically located together, but it can comprise different instructions stored in different locations which, when logically joined together, comprise the module and achieve the objective determined for the module.
[0062] In fact, an executable code module can be a single instruction, or many instructions, and can even be distributed over different segments of code, between different programs, and through different memory devices. Similarly, operational data can be identified and illustrated here within the modules, and can be incorporated in any suitable form and organized into any suitable type of data structure. Operational data can be collected as a single data set, or can be distributed over different locations that include different storage devices, and can exist, at least partially, merely as electronic signals on a system or network. The modules can be passive or active, which include agents capable of being operated to perform the desired functions.
[0063] Reference through the present specification to "an example" or "example" means that a particular feature, structure, or feature described in connection with the example is included in at least one embodiment of the present invention. Thus, the appearance of phrases "in an example" or the term "exemplary" in various places throughout the present specification are not necessarily all referring to the same modality.
[0064] As used here, a plurality of items, structural elements, elements of composition, and / or materials can be presented in a common list for the sake of convenience. However, such lists must be constructed if each member of the list is individually identified as a unique and separate member. Thus, no individual member of that list should be constructed as a de facto equivalent of any other member of the same list in isolation based on its presentation in a common group without indications to the contrary. In addition, various embodiments and examples of the present invention can be referred to here together with alternatives to the various components thereof. It is understood that said modalities, examples, and alternatives should not be constructed as in fact equivalent to each other, but should be considered as separate and autonomous representations of the present invention.
[0065] Furthermore, the described features, structures, or features can be combined in any suitable mode in one or more modalities. In the description below, numerous specific details are provided (for example, examples of layouts, distances, examples of network) to provide a true understanding of the modalities of the present invention. Those skilled in the art can recognize, however, that the present invention can be practiced without one or more of the specific details, or with other methods, components, layouts, etc. In other examples, well-known structures, materials, or operations are not shown or described in detail to avoid obstructing aspects of the present invention.
[0066] Although the previous examples are illustrative of the principles of the present invention in one or more particular applications, it will be apparent to those skilled in the art that numerous changes in the form, use and details of the implementation can be carried out without exercising the inventive power, and without deviating from the principles and concepts of the present invention. Therefore, it is not intended that the present invention be limited, except for the claims set forth below.

权利要求:
Claims (19)
[0001]
1. Method (700) of generating a design for a dental restoration product from one or more dental images of a patient characterized by the fact that it comprises: obtaining (710) a three-dimensional (3D) image of pre-traumatic dentition of the patient before trauma to the patient's dentition; obtain a 3D image of the patient's post-traumatic dentition after trauma to the patient's dentition; automatically generate (730), by a processor, a dental restoration product file containing a dental restoration product design for at least one patient's tooth based on at least one difference between the patient's pre-traumatic dentition 3D image and a 3D image of the patient's post-traumatic dentition; manufacture the dental restoration product based on the design; where the dental restoration product file includes dental tissue present in the 3D image of pre-trauma dentition but absent in the 3D image of post-trauma dentition.
[0002]
2. Method according to claim 1, characterized by the fact that manufacturing the dental restoration product still comprises: sending the design to a manufacturing device (150) that includes at least one selected from the group consisting of a milling machine and an additive manufacturing device, in which the step of obtaining a 3D image of the patient's pre-traumatic dentition is performed in a dental office, and where the manufacturing device is located in the dental office ; and fabricating the dental restoration product using the design-based fabrication device.
[0003]
3. Method, according to claim 2, characterized by the fact that the additive manufacturing device uses at least one selected from the group consisting of stereolithography and digital light processor.
[0004]
4. Method according to claim 1, characterized by the fact that obtaining the 3D image of the pre-traumatic dentition of the patient comprises acquiring the 3D image of the pre-traumatic dentition from an imaging device that comprises at least one selected from the group consisting of an intraoral imaging device and a volumetric dental imaging device.
[0005]
5. Method, according to claim 1, characterized by the fact that obtaining the 3D image of the patient's pre-traumatic dentition still comprises: acquiring an intraoral image of the patient using a non-ionization reader in which the intraoral image includes a file of surface geometry and the non-ionization reader includes at least one selected from the group consisting of an optical reader and a laser reader; or acquire a volumetric dental image of the patient using at least one selected from the group consisting of X-ray computed tomography, magnetic resonance imaging (MRI), and ultrasound imaging.
[0006]
6. Method, according to claim 1, characterized by the fact that obtaining the 3D image of the patient's pre-traumatic dentition still comprises: acquiring an intraoral image of the patient using a non-ionization imaging device; determine a crown surface for a tooth above a periodontium based on the intraoral image; acquire a volumetric dental image of the patient using an X-ray based imaging device; determine a tooth tissue geometry for the tooth that includes at least a portion of root tissue surrounded by the periodontium based on the volumetric dental image; and generating the 3D image of pre-traumatic dentition including the crown surface and at least a portion of the root tissue based on a combination of the intraoral image and the volumetric dental image using an image registration process.
[0007]
7. Method, according to claim 1, characterized by the fact that: the design comprises at least one selected from the group consisting of a computer-aided design format file (CAD format) and an image file; and the dental restoration product comprises at least one selected from the group consisting of a dental prosthesis, a denture, an implant, an inlay, a filler, a plug, a crown, an onlay, and a varnish.
[0008]
8. Method, according to claim 1, characterized by the fact that it still comprises: storing, in a data storage device, a 3D image of the patient's pre-traumatic dentition in a personalized library associated with the patient.
[0009]
9. Method, according to claim 8, characterized by the fact that it still comprises: segmenting the 3D image of the patient's pre-traumatic dentition to generate crown data for a tooth; process the crown data to generate a crown design file; and store the crown design file in a custom library associated with the patient.
[0010]
10. Method, according to claim 9, characterized by the fact that the generating step still comprises: obtaining the crown design file from the personalized library; and generate the dental restoration product design based on the crown design file.
[0011]
11. Method, according to claim 9, characterized by the fact that: obtaining a 3D image of the patient's pre-traumatic dentition still comprises obtaining a pre-trauma design file previously saved in a personalized library of a dental storage device. data before damage occurs to a tooth; obtaining a 3D image of the patient's post-traumatic dentition still comprises obtaining a post-trauma design file saved in the custom library after damage to the tooth occurs; automatically generating, by a processor, a dental restoration product file still comprises: comparing the pre-trauma design file and the post-trauma design file for the tooth; and generating the dental restoration product file based on a comparison between the pre-trauma design file and the post-trauma design file.
[0012]
12. Method, according to claim 9, characterized by the fact that segmenting the patient's pre-traumatic dentition 3D image still comprises: differentiating between tooth tissue and nonwoven tooth in the pre-trauma dentition 3D image ; and generate tooth crown data based on tooth tissue in a 3D image of pre-trauma dentition.
[0013]
13. Method, according to claim 1, characterized by the fact that it still comprises preparing a tooth for restoration after the step of obtaining a three-dimensional image of the patient's pre-traumatic dentition, and in which the post-trauma 3D image is a 3D image of the patient's dentition after the preparation step.
[0014]
14. Computer-aided design (CAD) system configured to generate a design for a dental restoration product from one or more dental images (134) of a patient, characterized by the fact that it has a computer circuit configured to: a three-dimensional (3D) image of the patient's pre-traumatic dentition before a trauma to the patient's dentition; obtain a 3D image of the patient's post-traumatic dentition after trauma to the patient's dentition; and automatically generate a dental restoration product file containing the dental restoration product design for at least one patient's tooth based on at least one difference between the patient's pre-trauma dentition 3D image and the post dentition 3D image -trauma of the patient; manufacture the dental restoration product based on the design; where the dental restoration product file includes dental tissue present in the 3D image of pre-trauma dentition but absent in the 3D image of post-trauma dentition.
[0015]
15.System, according to claim 14, characterized by the fact that it is still configured to: acquire the 3D image of pre-traumatic dentition from an imaging device comprising at least one selected from the group consisting of device intraoral imaging and volumetric dental imaging device.
[0016]
16. System (100) operable to generate a design for a dental restoration product from one or more dental images (134) of a patient characterized by the fact that it comprises: an imaging module (144) configured to: obtain a three-dimensional (3D) image of the patient's pre-traumatic dentition before a trauma to the patient's dentition; and obtain a 3D image of the patient's post-traumatic dentition after trauma to the patient's dentition; a design module (148) configured to: automatically generate a dental restoration product file containing the dental restoration product design for at least one patient's tooth based on at least one difference between the pre-trauma 3D dentition image of the patient and the 3D image of the patient's post-traumatic dentition; where the dental restoration product file includes dental tissue present in the 3D image of pre-trauma dentition but absent in the 3D image of post-trauma dentition; and a manufacturing device configured to manufacture the dental restoration product based on the design.
[0017]
17. The system according to claim 16, characterized by the fact that it still comprises: the manufacturing device (150) comprising at least one selected from the group consisting of a milling machine and a manufacturing device. additive.
[0018]
18. The system according to claim 16, characterized by the fact that it still comprises: an image acquisition device (150) comprising at least one selected from the group consisting of an intraoral imaging device and a device volumetric dental imaging, the image acquisition device configured to acquire the 3D image of pre-traumatic dentition.
[0019]
19. The system according to claim 16, characterized by the fact that it still comprises: a storage device (130) configured to store the 3D image of the patient's pre-traumatic dentition before the trauma to the dentition in a personalized library associated with the patient.

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同族专利:

公开号 | 公开日

CN106296802A|2017-01-04|

KR20170000794A|2017-01-03|

BR102016014195A2|2017-01-24|

EP3108850A2|2016-12-28|

US20160374784A1|2016-12-29|

US10098715B2|2018-10-16|

EP3108850A3|2017-02-15|

JP2017006658A|2017-01-12|

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法律状态:
2017-01-24| B03A| Publication of an application: publication of a patent application or of a certificate of addition of invention|

2020-04-07| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

2020-09-08| B09A| Decision: intention to grant|

2020-12-08| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 17/06/2016, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

申请号 | 申请日 | 专利标题

US14/749,294|US10098715B2|2015-06-24|2015-06-24|Generating a design for a dental restorative product from dental images|

US14/749,294|2015-06-24|

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