• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a dental matrix (1), particularly for the restoration of anterior teeth, comprising: a central collar (2) and two wings (3, 4); an internal face (5) intended to be turned towards a tooth during the application of the matrix, and an opposite external face (6); in which on both sides the matrix comprises a proximal zone between the collar and the respective right or left wing, and said proximal zone comprises a convex surface (10), such that in the proximal zone the external face (6) of the matrix is convex and the inner face (5) is concave.
    公开号:CH716341B1
    申请号:CH01478/20
    申请日:2019-02-19
    公开日:2021-05-14
    发明作者:Pérez Casas Jordi
    申请人:Polydentia Sa；
    IPC主号:
    专利说明:

    Field of application
    [0001] The invention relates to the field of dental matrices.
    Known art
    [0002] The dental matrix (matrix band) is a well known object, used by dentists during restorative interventions on anterior and posterior teeth, in the treatment of caries and aesthetic modification in conservative dentistry.
    A dental matrix is essentially a thin, flexible strip that is positioned around the tooth during the procedure in order to create an artificial wall to hold the restorative material as it is applied. In other words, the task of the matrix is to replace a missing tooth wall around a cavity, which can be formed following the removal of damaged tissue, e.g. from tooth decay. The matrix, depending on its type (circumferential or sectional) is held in position with appropriate accessories, such as tensioners, pliers or clips, wedges in plastic and / or wood. At the end of the procedure, when the restorative material has hardened, the matrix is removed.
    Materials used for the manufacture of dental matrices include stainless steel, other metals or metal alloys, or polymers. In some embodiments, the dental matrix has a coating that prevents the restorative material from adhering to the matrix and, consequently, facilitates its removal.
    [0005] A dental matrix of the known art is essentially presented as a strip or band which has a rectangular shape, in the simplest cases, or a shaped shape. For example, a known type of dental matrix (called "Tofflemire") has a "boomerang" -shaped shape comprising two more or less inclined branches which join at a vertex.
    [0006] The shaped matrices have been developed with the aim of improving the approximation of the natural shape of the tooth and facilitating the introduction and correct arrangement of the restorative material. However, the shaped matrices of the known art have essentially evolved to approximate the posterior teeth, that is molars and premolars, which have historically been the most affected by caries and consequently most frequently the object of restoration in conservative dentistry.
    [0007] For this reason, the solutions offered by the known art for the restoration of anterior teeth, where with this term we mean incisors and canines, are limited in terms of choice and adequacy of performance. Specifically, the available matrices are unable to approximate the interproximal walls and the cervical area at the same time and precisely, making the restoration procedure more laborious and complex. The quality of the result is not always satisfactory and, in any case, it depends a lot on the skill of the dentist.
    [0008] The demand for anterior tooth reconstruction is increasing, not only to repair carious lesions or trauma, but also to correct shape defects. The need to correct shape defects of the anterior teeth, which are the most visible, is increasingly felt by patients for aesthetic reasons. For these reasons, reconstructive interventions, previously limited essentially to the posterior teeth, are increasingly frequent also for the anterior teeth. However, the known art of dental matrices does not offer a satisfactory answer to this need.
    Summary of the invention
    [0009] The invention aims to provide a dental matrix with an optimized shaped shape for reconstruction of the anterior teeth. More in detail, an object of the invention is to provide an anatomical dental matrix capable of satisfactorily approximating the shape of the lateral (proximal) and cervical walls of the anterior teeth, so as to facilitate the dentist's work and improve the precision of application. of the reconstructive material.
    [0010] The objects are achieved with a matrix which comprises a central collar and two wings respectively left and right which protrude from said collar; an internal face intended to be turned towards a tooth during the application of the matrix and an opposite external face; on both sides the matrix comprises a proximal zone of connection and junction between the collar and the respective wing, and said proximal zone comprises a convex surface, such that in correspondence with said convex surface the external face of the matrix is convex and the face internal is concave.
    [0011] The Applicant has found that a convex shape of the proximal zones, which are located between the collar and the wings, is anatomically optimal for use in the restoration or reconstruction of the anterior teeth. With this rounded shape, the matrix optimally approximates the anatomy of the tooth, optimizes the positioning of the restorative material and facilitates the dentist's work.
    [0012] Some preferred features are disclosed in the dependent claims.
    [0013] In one embodiment, for example, said convex surface comprises, or consists of, a cylindrical surface. In another embodiment, said convex surface comprises, or consists of, a spherical surface. In another embodiment, said convex surface comprises, or consists of, an anatomical surface having multiple radii of curvature.
    [0014] Preferably the matrix is symmetrical with respect to a plane whose trace is a central axis passing through a midpoint of the collar. A longitudinal direction of the matrix can be defined, substantially in accordance with said axis which represents the trace of said symmetry plane, and a radial direction away from said axis.
    [0015] In one embodiment, said convex surface forms a band comprised between an upper outer edge of the die and a lower demarcation line, below which the respective wing of the die extends. Preferably the convex band extends in the aforementioned radial direction while the wing extends mainly in the longitudinal direction, possibly with a certain inclination with respect to the axis of symmetry.
    [0016] Preferably said band has a greater width than the wing. For example, in one embodiment, said band is externally delimited by an edge which forms a recess connecting to an external edge of the wing, so that the width of the wing is less than the width of the convex band.
    [0017] The two wings extend on the same side with respect to the collar so that the matrix has an essentially U or V shape.
    In one embodiment, the two wings extend relative to the collar in divergent directions. For example, in preferred embodiments, each of the two wings extends in a direction which, with respect to a central axis of the matrix, forms an angle of from 5 ° to 30 °, preferably 15 ° or about 15 °. Said central axis is preferably also an axis of symmetry.
    [0019] Preferably, the collar has a central area of minimum width. In one embodiment, the collar has a double concave profile which defines said central area of minimum width. In one embodiment, said double concave profile is given by curvilinear edges of the collar, with centers of curvature on opposite sides of the collar itself.
    [0020] The collar, being delimited by at least partly curvilinear edges with centers of curvature on opposite sides with respect to the collar itself, assumes a double concave profile that tapers in the center and assumes greater width towards the sides, that is towards said proximal areas connection.
    In one embodiment, the collar is delimited by a lower edge, which is located in the space between the two wings, and by an upper edge, which faces away from the two wings. At least a portion of the lower edge follows an arc of circumference with a first center located at a point between the wings, and at least a portion of the upper edge follows an arc of circumference with a second center located on the opposite side of the collar with respect to in the first center.
    [0022] In a preferred embodiment, said upper edge comprises two lateral portions with an arc of circumference, and a rectilinear central portion corresponding to the area of minimum width of the collar.
    [0023] The wings preferably have a constant width section and terminate with a curved end edge, preferably in an arc of a circle and even more preferably in a semicircle.
    [0024] The matrix can be made of metal or polymeric material. Preferred materials for making the matrix according to the invention include: stainless steel, titanium and its alloys, polyester. In a preferred embodiment, the material is AISI 304 stainless steel.
    [0025] In a preferred embodiment, the matrix is made of stainless steel which has undergone a surface treatment. Said surface treatment may include coloring to make the operating field better visible by the specialist during the restoration.
    [0026] The thickness of the matrix is preferably a few hundredths of a millimeter, for example 3/100 of a mm.
    The matrix is preferably disposable.
    [0028] The matrix can be obtained with a blanking process, which obtains a flat matrix of the desired shape, and subsequent shaping (crowning) stage which defines the convex areas.
    [0029] The shape characteristics of the matrix, which have been described up to now, are to be understood as referring to the flat development of the matrix. In use, thanks to its flexibility, the matrix is arranged in an arrangement in which the two wings are bent towards each other, bringing the two rounded inter-proximal surfaces to face one another.
    Another aspect of the invention is represented by a kit for the restoration of anterior teeth comprising at least one matrix according to any one of the embodiments described above. In addition to a number of matrices, the kit may include, for example, wedges and / or forceps for positioning the matrix around a tooth.
    [0031] The matrix according to the invention makes it possible to correctly reproduce both the geometry of the tooth in the interproximal area and the cervical area of the tooth. The advantages of the invention will become clearer with the help of the following description, referring to a preferred embodiment.
    Brief description of the figures
    [0032] Fig. 1 shows the development on a plane of a matrix according to a way of carrying out the invention. Fig. 2 shows, in perspective view, the matrix of Fig. 1 in the folded position for use. Fig. 3 shows the matrix of Fig. 1 during its use, positioned around an anterior tooth.
    Detailed description
    Fig. 1 shows the development of a shaped dental matrix, for use in the reconstruction of anterior teeth, generally indicated by the reference 1.
    [0034] The matrix 1 has a symmetrical shape with respect to a plane whose trace in Fig. 1 is given by the axis A-A and essentially comprises a collar 2 and wings 3, 4 respectively left and right.
    [0035] The matrix 1 also has an internal face 5 intended to be turned towards a tooth during the application of the matrix, and an opposite external face 6.
    [0036] On both sides (left and right in Fig. 1), the matrix 1 comprises a first proximal zone 7 and a second proximal zone 8 which represent areas of connection and junction between the collar 2 and the respective left wing 3 or right wing 4.
    [0037] Each of said proximal areas 7 and 8 comprises a convex surface, ie having a curvature, such that in the proximal areas 7 and 8 the external face 6 of the matrix is convex while the internal face 5 is concave. The external face 6 corresponds to the plane of the drawing in Fig. 1; the two faces 5 and 6 are better visible in the view of Fig. 2 in which the matrix 1 is folded ready for use.
    [0038] Said convex surface, in zones 7 and 8, can be for example cylindrical, spherical or have variable radii of curvature in different embodiments of the invention.
    [0039] The convex surface, in the example illustrated, essentially forms a band 10 which is comprised between an upper edge 11 and a lower edge 12. The upper edge 11 is also an edge of the matrix 1, the lower edge 12 essentially delimits the convex band 10 from the respective wing 3 or 4, which extends below said lower edge 12. The edge 12 can be formed during a step of crowning the matrix 1.
    [0040] The convex band 10 extends in an essentially radial direction with respect to the axis A-A. On the external side, the convex band 10 is delimited by an edge 13 which forms a recess 14 or knee. Preferably, said recess 14 is located under the lower edge 12 of the convex band 10, i.e. on the opposite side of the collar 2 with respect to said edge 12.
    [0041] Some details in Fig. 1 are shown only with reference to the wing 3 for simplicity, the other wing 4 being symmetrical to the wing 3 with respect to the axis A-A.
    [0042] The figures show a preferred embodiment, by way of example, in which the two wings 3, 4 extend with respect to the collar in diverging directions, each forming an axis of about 15 ° with respect to the axis A-A. Overall, the matrix 1 when placed on a plane takes a U or V shape.
    [0043] The wings 3, 4 have an area 15 of constant width and an end 16 delimited by a rounded edge 17, preferably semicircular.
    [0044] The collar 2 is essentially delimited by a lower edge 18 and an upper edge 19.
    [0045] The lower edge 18 follows an arc of a circle centered at a point 20 on the A-A axis, between the two wings 3 and 4.
    [0046] The upper edge 19 preferably has two portions 19a and 19b with an arc of circumference and a rectilinear central zone 21. The portions 19a and 19b are connected continuously with the edges 11 of the convex bands 10, on both sides.
    [0047] The portions 19a and 19b respectively have centers 22, 23 on the opposite side of the center 20, with respect to the collar 2. Therefore the collar 2, as can be seen in the figure, assumes a double concave shape, which defines a central part 24 plus thin (part of minimum width).
    [0048] The matrix 1 is made for example of stainless steel starting from a thin sheet (eg 0.03 mm) so as to be flexible. The matrix can thus be folded for installation as in Fig. 2.
    [0049] Figure 2 shows the matrix 1 in the setting of implementation, in which the inter-proximal areas 7, 8 face each other and together with the collar 2 define containment walls for the reconstructive material around a tooth front.
    [0050] Fig. 3, which shows the matrix 1 in use on an anterior tooth T, allows us to see that, thanks to the convexity of the inter-proximal bands and of the collar 2, the matrix 1 is able to correctly approximate the shape of the walls of the tooth, more efficiently than the matrices of the known art. In this way the supply of restorative material is more precise and the final result is of better quality, making the work of the specialist faster and more effective.
    权利要求:
    Claims (14)
    [1]
    1. Shaped dental matrix (1), particularly for use in the restoration of anterior teeth, comprising: a central collar (2) and two wings respectively left (3) and right (4) which protrude from said collar; an internal face (5) intended to be turned towards a tooth during the application of the matrix, and an opposite external face (6); in which on both sides the matrix comprises a proximal zone (7, 8) of connection and junction between the collar (2) and the respective left or right wing, and said proximal zone (7, 8) comprises a rounded surface (10 ), such that in correspondence with said convex surface the external face (6) of the matrix is convex and the internal face (5) is concave.
    [2]
    2. Die according to claim 1, wherein said convex surface comprises, or consists of, at least one of: a cylindrical surface; a spherical surface, an anatomical surface having multiple radii of curvature.
    [3]
    Matrix according to one of the preceding claims, wherein said convex surface (10), on each side of the matrix, forms a band comprised between an upper edge (11) of the matrix and a lower demarcation edge (12), below of which the respective wing (3, 4) of the matrix extends.
    [4]
    Matrix according to claim 3 wherein said band (10) has a width greater than the wing.
    [5]
    5. Matrix according to claim 3 or 4, wherein said band (10) extends mainly in a radial direction with respect to a plane of symmetry of the matrix itself.
    [6]
    6. Matrix according to one of the preceding claims, in which the two wings extend with respect to the collar in diverging directions.
    [7]
    7. Die according to claim 6, wherein each of the two wings extends in a direction which, with respect to a plane of symmetry of the same die, forms an angle of from 5 ° to 30 °, preferably 15 °.
    [8]
    8. Matrix according to one of the preceding claims in which the collar has a central area of minimum width.
    [9]
    9. Matrix according to claim 8, wherein the collar has a double concave profile delimited by at least partly curvilinear edges and with centers of curvature on opposite sides of the collar itself.
    [10]
    10. Matrix according to claim 8 or 9, wherein the collar has a lower edge (18) in the space between the two wings and an upper edge (19) facing away from the two wings, and at least a portion of the lower edge ( 18) follows an arc of circumference with a first center (20) located at a point between the wings, and at least a portion of the upper edge (19) follows an arc of circumference with a second center (22, 23) which runs located on the opposite side of the collar with respect to the first center.
    [11]
    11. Matrix according to claim 10, wherein the upper edge (19) comprises two lateral portions (19a, 19b) with an arc of circumference, and a central portion (21) rectilinear.
    [12]
    Matrix according to one of the preceding claims, made of metal or of a metal alloy or of a polymeric material, preferably stainless steel.
    [13]
    13. Matrix according to one of the preceding claims, made of stainless steel which has been subjected to a coloring surface treatment suitable to make the operating field better visible during use.
    [14]
    Kit for the restoration of anterior teeth comprising at least one matrix (1) according to one of the preceding claims and comprising wedges and / or forceps for positioning the matrix around a tooth.
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    同族专利:
    公开号 | 公开日
    IT201800005690A1|2019-11-24|
    WO2019224614A1|2019-11-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2611182A|1949-12-27|1952-09-23|Benjamin F Tofflemire|Anatomical contact-forming dental matrix band for anterior teeth|
    US3145472A|1962-06-04|1964-08-25|Benjamin F Tofflemire|Pre-contoured dental matrix band|
    US20080064003A1|2006-09-13|2008-03-13|Clark David J|Dental Matrix Devices And A Seamless, Single Load Cavity Preparation And Filling Technique|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    IT102018000005690A|IT201800005690A1|2018-05-24|2018-05-24|Dental matrix|
    PCT/IB2019/051329|WO2019224614A1|2018-05-24|2019-02-19|Dental matrix|
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