WO2023033764A1

WO2023033764A1 - A novel anterior segmented-anatomical matrix system

Info

Publication number: WO2023033764A1
Application number: PCT/TR2022/050877
Authority: WO
Inventors: Hacer BALKAYA; Sezer DEMİRBUĞA
Original assignee: T.C. Erci̇yes Üni̇versi̇tesi̇
Priority date: 2021-08-31
Filing date: 2022-08-19
Publication date: 2023-03-09

Abstract

A matrix band (100), which is used in dentistry to restore the lost anatomy of the teeth, to create the ideal contact point or surface with the adjacent teeth, to ensure the harmony of the tooth with the surrounding soft tissues, to create ideal embrasure areas, to prevent overcontour filling, to prevent the filling from adhering to the adjacent tooth, characterized by comprising both an approximal part (110) conforming to the convex curvature of the approximal surfaces of the teeth and a palatal part (120) conforming to the concave curvature of the palatal surface of the teeth at the same time, so that when placed on the tooth, the matrix band (100) fully wraps around and follows the anatomy of the outer surface of the tooth.

Description

A NOVEL ANTERIOR SEGMENTED-ANATOMICAL MATRIX SYSTEM

Technical Field

The invention relates to a matrix band used in dentistry to restore the lost anatomy of teeth, to create an ideal contact point or surface with adjacent teeth, to ensure the harmony of the tooth with the surrounding soft tissues, to create ideal embrasure areas, to prevent overcontour filling, to prevent the filling from sticking to the adjacent tooth.

In particular, the invention relates to a matrix band used in the restoration of anterior teeth, which is made of stainless steel and transparent polyester material, which does not have any harmful effects on the patient thanks to its stainless steel and transparent polyester material, which offers cost advantage, which has ease of application, which allows the physician to choose the most suitable matrix thanks to its different sizes and shapes, which allows the restoration of the lost anatomy of the tooth more aesthetically and functionally more ideal restorations, which minimizes the need for physiciandependent manipulation ability in aesthetic restorations.

Prior Art

In dentistry, matrix bands are used to restore the lost anatomy of the teeth, to create an ideal contact point or surface with the adjacent teeth, to ensure the harmony of the tooth with the surrounding soft tissues, to create ideal embrasure areas, to prevent overcontour filling, to prevent the filling from adhering to the adjacent tooth. In the restorations of posterior group teeth (premolars and molars), ring-shaped bands or segmented matrix bands with anatomical curvature are generally used with the help of a special holder. However, since the anterior teeth differ anatomically from the posterior teeth, the same systems cannot be used in the restorations of the anterior teeth. For this reason, dentists usually use non-anatomical transparent or metal bands with flat surfaces, silicone keys prepared after taking an impression or by modifying the bands of the posterior region in anterior restorations. However, restorations made in this way are insufficient to provide the ideal aesthetic and functional properties and often fail to satisfy not only dentists but also patients.

Since the anatomical structures of the anterior teeth are completely different from the posterior teeth, the posterior matrix bands, which are currently marketed by many companies, are not suitable for the anterior teeth. There is no special system developed as an anterior matrix band on the market, only in the form of bands (without any preshape); Standard and prefabricated transparent or metal structures with flat surfaces in 0.5-1 cm widths, in 0.05-0.3 mm thicknesses and varying lengths are used. Previously, these structures were preferred in the posterior region, but their use is gradually being abandoned by today’s dentists due to their inadequate adaptation to the convex approximal anatomy of the teeth, their inadequacy in providing the ideal embrasure and contact structure, and their lack of ergonomics due to the need for special holders. In their place, segmented and anatomical matrix bands, which can be applied alone or only in combination with a small ring-shaped holder, have been introduced to the market and the performance of these systems has been widely accepted by dentists. At the same time, they have increased patient comfort as they do not cause cheek and lip injuries. Interestingly, these developments for the posterior region were not considered for the anterior region. However, the development of matrix bands suitable for the anatomy of the anterior teeth is a great need today, when the aesthetic expectations of both society and dentists are increasing. Because when dentists use existing products, they cannot provide the convexity of the anterior teeth, especially the approximal surfaces, and the triangular appearance of the teeth is either exaggerated or a rectangular appearance is obtained. This situation also means that the gingival embrasure space where the gingival papilla will be located is not ideally made and thus the gingival aesthetics are also impaired. In addition, excessive overflow or incomplete condensation of the restorative material on the palatal/lingual surfaces can be observed, and unnecessary restoration overflows in this area leave dentists in a difficult situation if the band used cannot adequately wrap the gingival step. It may cause bacterial and food retention. Long efforts may be required during finishing. Possible excesses are felt by the tongue, which can perceive even the smallest change in the mouth and disturb the patients.

Today, polyester transparent flat matrix bands are frequently used in the restoration of anterior teeth. However, these bands are not given any anatomical form, they cannot fully adapt to the palatal and approximal curvatures of the teeth due to their flat surface structure, and it is difficult to give a stable shape in the mouth due to their shape memory. In addition, the biggest disadvantage is that due to its soft structure, it cannot make its way in the cavities extending under the gingiva and cannot reach the gingival step.

Nowadays, dentists often use the silicone key method to compensate for the deficiencies of the anterior matrix bands. In this method, a plaster model is cast by taking impressions from the patients in advance, and modeling is performed on this plaster model with wax and similar materials in order to bring the relevant tooth to the ideal anatomical form. After this final form of the tooth is measured with a silicone impression material, the excess is cut off and adapted to the mouth. The restoration to be made in the mouth is based on this silicone key. However, since the silicone key obtained in this method does not have a part that can reach the interface of the teeth, it is only effective in forming the palatal wall of the teeth. They cannot form the approximal wall. In addition, this method is time consuming, carries the risk of contamination between laboratory steps and is costly.

As a result, the need for a matrix band that eliminates the disadvantages of the prior art and the inadequacy of existing solutions necessitated a development in the relevant technical field.

Brief Description of the Invention

The present invention relates to a matrix band that meets the above-mentioned requirements, eliminates all disadvantages and brings some additional advantages, and is used in dentistry to restore the lost anatomy of the teeth, to create an ideal contact point or surface with the adjacent teeth, to ensure the harmony of the tooth with the surrounding soft tissues, to create ideal embrasure areas, to prevent overcontour filling, to prevent the filling from sticking to the adjacent tooth.

Based on the state of the art, the aim of the invention is to provide a more aesthetically pleasing restoration of the lost anatomy of the tooth palatally, approximally and incisally, as well as more functionally ideal restorations and less need for post- restoration finishing.

The aim of the invention is to provide cost reduction and ease of application thanks to the structure of the matrix band and the material from which it is manufactured.

Another aim of the invention is to enable the physician to choose the most suitable matrix by its different shapes and sizes. Another aim of the invention is to shorten the completion time of the restoration and to increase the number of restorations that can be performed in a single session.

Another aim of the invention is to provide a safe product that does not pose a risk to human health thanks to the stainless steel and transparent polyester structure of the developed matrix band.

Another aim of the invention is to minimize the need for physician-dependent manipulation skills in aesthetic restorations.

Another aim of the invention is to ensure that the matrix band, when placed on the tooth, perfectly wraps and follows the anatomy of the outer surface of the tooth, by the fact that it contains the convex curvature of the approximal surfaces of the teeth and the concave curvature of the palatal surface at the same time.

A further aim of the invention is to provide an ideal restoration of the tooth, regardless of the rate of material loss, by the tightly fitting structure of the matrix band on the tooth.

A further aim of the invention is to provide a great advantage in making a sealed restoration in approximal cavities that descend below the gingiva thanks to the gingival extension version.

The structural and characteristic features and all advantages of the invention will be more clearly understood by means of the figures given below and the detailed description written by making references to these figures, therefore, the evaluation should be made by considering these figures and detailed descriptions.

Brief Description of the Drawings

In order to best understand the structure of the present invention and its advantages with additional elements, it should be evaluated together with the figures described below.

Figure-1 shows a schematic overview of the unfolded matrix band,

Figure-2a shows a schematic overview of the matrix band from the proximal side,

Figure-2b shows the frontal schematic overview of the matrix band,

Figure-2c shows an oblique schematic overview of the inner surface of the matrix band,

Figure-2d shows an oblique schematic overview of the outer surface of the matrix band. Reference Numbers

100. Matrix band

110. Approximal part

120. Palatal part a: Anterio-posterior width of the proximal part at the incisal b: Mesio-distal width of the palatal part at the incision c: Anterio-posterior width of the proximal fragment in the middle triad d: Mesio-distal width of the palatal part in the middle third e: Anterio-posterior width of the approximal fragment in the gingival triad f: Mesio-distal width of the palatal part in the gingival triad g: Depth of the gingival extension of the approximal part h: Depth of the gingival extension of the palatal part x: Inciso-gingival length of standard bands z: Inciso-gingival length of modified bands

Detailed Description of the Invention

In this detailed description, the matrix band (100) used in the inventive dentistry to restore the lost anatomy of the teeth, to create an ideal contact point or surface with the adjacent teeth, to ensure the harmony of the tooth with the surrounding soft tissues, to create ideal embrasure areas, to prevent overcontour filling, to prevent the filling from sticking to the adjacent tooth, is described only as an example for a better understanding of the subject matter and without any limiting effect.

The matrix band (100) of the invention has the feature that, when placed on the tooth, it perfectly wraps and follows the anatomy of the outer surface of the tooth, thanks to the fact that it contains the approximal part (110) and the palatal part (120) at the same time, which are suitable for the convex curvature of the approximal surfaces of the teeth and the concave curvature of the palatal surface. The matrix band (100), which fits tightly on the tooth, allows the tooth to be ideally restored regardless of the material loss rate. In addition, in approximal cavities that descend below the gingiva, the gingival extension version of the matrix band (100) provides a great advantage in making a leakproof restoration. The matrix band (100) shown in Figure 1 includes the approximal part (110) and palatal parts (120). In the approximal part (110), the anterioposterior width of the proximal part at the incisal (a) is preferably 1.5 mm, and the mesiodistal width of the palatal part at the incisal (b) is preferably 8 mm, anterioposterior width of the proximal part in the middle triad (c) preferably 5 mm, mesiodistal width of the palatal part in the middle triad (d) preferably 7 mm, anterioposterior width of the approximal part in the gingival triad (e) preferably 8 mm, the mesiodistal width of the palatal fragment at the gingival triad (this edge is also the termination point of (standard) bands without gingival extension) (f) preferably 4 mm, the depth of the gingival extension of the approximal fragment (g) preferably 2.5 mm, the depth of the gingival extension of the palatal part (h) is preferably 1.5 mm, the incisogingival length (x) of the standard bands is preferably 10 mm, and the incisogingival length (z) of the modified bands is preferably 12.5 mm. In the palatal part (120), the anterioposterior width of the proximal part at the incisal (a) is preferably 1.5 mm, and the mesiodistal width of the palatal part at the incisal (b) is preferably 5 mm, anterioposterior width of the proximal part in the middle triad (c) preferably 4 mm, mesiodistal width of the palatal part in the middle triad (d) preferably 4 mm, anterioposterior width of the approximal part in the gingival triad (e) preferably 7 mm, The mesiodistal width of the gingival triangle of the palatal piece (this edge is also the termination point of the (standard) bands without gingival extension) (f) is preferably 3 mm, the depth of the gingival extension of the approximal piece (g) is preferably 2 mm, the depth of the gingival extension of the palatal piece (h) is preferably 1 mm, the incisogingival length of the standard bands (x) is preferably 8 mm, the incisogingival length of the modified bands (z) is preferably 10 mm. These measurements were determined with reference to the average of the measurements of extracted upper and lower incisors of the Turkish population. Said measurements refer to the approximal part (110) and palatal part (120) surfaces of a medium-sized gingival extension band. Said matrix band (100) is manufactured from stainless steel and/or transparent polyester materials, preferably by heat forming. The material is pre-shaped according to the anatomy of the teeth by heat treatment. Other suitable forming methods may also be applied in the manufacture of said matrix band (100).

Each matrix band (100) has two parts, the palatal part (120) and the approximal (mesial or distal) part (110) shown in Figure-2a. In other words, each matrix band (100) contains a palatal part (120) positioned on the palatal surface and an approximal part (110) positioned on the approximal surface. The mesial and distal winged bands are produced separately. The approximal part (110), shown in Figure-2b, is shaped convexly and ends in the buccal region with an edge parallel to the labial surface of the tooth (wide at the cervical, narrowing towards the incisal) and at least 1 mm higher than the labial surface. The gingival edge of the approximal part (110) shown in Figure-1 is produced in such a way that it may or may not extend into the gingiva. The palatal part (120) shown in Figure-2a is shaped concavely and is prepared to be narrow in the cervical region (cingulum region) and wide in the incisal region. It is at least 1 mm longer than the incisal edge and almost completely covers the palatal surface.

When the mentioned matrix band (100) is placed on the tooth, the matrix band (100) must completely contact the tooth on the palatal surface and approximal surface. For this reason, if necessary, the part of the matrix band (100) that contacts the cingulum area or the approximal part (110) extending to the palatine can be modified by cutting the part of the midline of the tooth outside the operation area with scissors. In cases where the selected matrix band (100) is not suitable for the crown length or labio-palatal width of the tooth, it can be selected in one smaller or one larger size. The palatal part (120) of the matrix band (100) should be supported by finger pressure during the operation. Thus, the possibility of overflow filling in the palatal part is eliminated and less need for finishing is required. Since the matrix band (100) is adapted to the tooth in a fit/tight manner, there is no need for an additional ring or holder with the help of wedge stabilization.

In approximal, the flat or curved gingival edge of the matrix band (100) should be inserted into the gingival groove and compressed with a wedge. In cases where the cavity ends below the gingiva, the matrix band (100) with gingival extension should be preferred. Transparent matrix bands (100) can be preferred to prevent air bubbles or lack of condensation, especially in the palatal part (120), or to allow the light emitted by the light device to reach more areas, especially when a thick layer of filling material is placed.

Preferably, the invention can also be obtained in the form of sterilizable, non-disposable products using cellulose acetate or other transparent materials, polyetherether ketone (PEEK), methacrylate and derivatives thereof, fibers and derivatives thereof, polymeric materials, nickel, titanium and other metals and alloys thereof and other similar materials.

In another preferred embodiment of the invention, the matrix band (100) is produced with a thickness of 0.05-0.3 mm, which is the thickness of conventionally used bands.

The palatal part (120) and the approximal part (110) of the mentioned matrix band (100) can be increased, decreased, or flattened in degrees of concavity or convexity to suit each case. Additional parts can be added to the matrix band (100), such as a labial gingival extension, a second approximal part, or it can be made more universal by reducing the surface area of the existing parts.

In the production of the matrix band (100), stainless steel and transparent polyester, which are also present in the structure of many materials used today, will be used, so there are no harmful effects. On the other hand, it is low cost and easy to apply. Different sizes and shapes allow the physician to choose the most suitable matrix. With the mentioned matrix band (100), the completion time of the restoration is shortened and the number of restorations that can be made in a single session can be increased. Palatally, approximally and incisally, it is possible to restore the lost anatomy of the tooth more aesthetically and to make more ideal restorations functionally. Other important advantages of the system are the reduced need for post-restoration finishing procedures and the minimization of the need for physician-dependent manipulation skills in aesthetic restorations.

Claims

CLAIMS A matrix band (100), which is used in dentistry to restore the lost anatomy of the teeth, to create the ideal contact point or surface with the adjacent teeth, to ensure the harmony of the tooth with the surrounding soft tissues, to create ideal embrasure areas, to prevent overcontour filling, to prevent the filling from adhering to the adjacent tooth, characterized by comprising both an approximal part (110) conforming to the convex curvature of the approximal surfaces of the teeth and a palatal part (120) conforming to the concave curvature of the palatal surface of the teeth at the same time, so that when placed on the tooth, the matrix band (100) fully wraps around and follows the anatomy of the outer surface of the tooth. The matrix band (100) according to claim 1, characterized by comprising one palatal part (120), which is concavely shaped, narrow in the cervical region (cingulum region) and wide in the incisal region, higher than the incisal edge of the tooth and almost completely covering the palatal surface, connected to the approximal part (110). The matrix band (100) according to claim 1 , characterized by comprising the approximal part (110), which is connected to the palatal part (120), convexly shaped, terminating in the buccal region, with an edge parallel to the labial surface of the tooth (wide cervically, narrowing incisally) and terminating higher than the labial surface. The matrix band (100) according to claim 1 , characterized in that the matrix band (100) is made of stainless steel and/or transparent polyester materials.

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