The present invention concerns a device for dental restoration, the device being intended to be used by dental surgeons.
The modern, and in particular, professional life, forces individuals to have a perfect physical presentation, as such the visits to dental surgeons is increasingly frequent. This is often to look at proximal caries and to reconstruct the tooth by filling the cavity. This filling, which was made by a dental metal amalgam, is now generally made of a composite material that the dentist polymerizes. The ideal, to set up this material, would be to use two corners between the teeth made of a transparent matrix of very low thickness. But the installation would be difficult and or not very certain position for obtaining a good result.
The device of this invention would solve the disadvantages of the traditional system thanks to simple, reliable, not very expensive, easy to install means.
Thus, according to the invention, the device, which is intended to be used at the time of the anatomical restoration of a tooth having proximal caries, is made of an elastically deformable material, and has two end-units connected by a vertical wall whose height is greater than its thickness. A device in which the two end-units are intended to be separated from each other by the vertical wall and is characterized in that the vertical wall has the shape of a corner; its height is sufficiently high to constitute by itself an inter-dental wall for the proximal caries such that the end-units are in contact with walls of the tooth with the proximal caries and those of the tooth next to the caries.
Thus, the solution according to the invention, essentially proposes a part forming an inter-dental elastic matrix which replaces all the former devices in which a general metal matrix is used with a particular elastic corner which comes to carry out the chock and wedging of the aforementioned matrix against the ed tooth. The advantages of this invention are numerous: installation of a single piece in only one movement to spread the spacing of the end-units with an already existing and easily available tool to a dental surgeon.
According to another complementary characteristic, the height of the vertical wall is equal to the height of the two end-units which have the same height as each other.
Let us add, that according to the preferred embodiment, the vertical wall has the shape of a corner, and is preferably formed of two curved concave surfaces which converge toward the top (HA).
According to the preferred embodiment of the invention, each unit is formed of an end wall with at least two different surfaces whose lower surface forms a chamfer.
Also according to the preferred embodiment, the top edge of the vertical wall constituted by a pointed edge making it possible to create the inter-dental point of contact, once finished with the dental restoration. If necessary, the dentist can put a restoration material directly on top of this edge which once solidified will constitute the inter-dental point or If need be to create a notch in the edge itself which will be filled directly with the restoration material.
Finally, according to the preferred embodiment, the device constitutes a single piece preferably made by injection molding.
It is understood that the device of the invention, also allows the user to slightly draw aside the two adjacent teeth with the aim of perfecting, after the removal of the matrix, the point of contact.
One will add that the device allows the dental surgeon, to create with the highest part of the vertical wall, a hole or a release, using a small cutter, in order to physically make the necessary point of contact between the two teeth.
Other characteristics and advantages of the invention will emerge from the description which follows as well as the annexed drawings which are given only by way of nonrestrictive examples.
a to 4a are views similar to those of
a & 5b are vertical cross-sectional views along C-C, D-D, of the device according to the preferred embodiment of
a, 6b are horizontal cross-sectional views along E-E, F-F, of the device according to the preferred embodiment of
The device indicated by the general reference, (1), is made of two end-units (2a, 2b) connected by a vertical wall (3).
According to a characteristic of the invention, the device (1) is made out of an elastic material such as elastomer, or any other similar material, such as latex. The elasticity of the material allows, as we will see, the deformation in extension of the piece at the time of the installation, and after which it returns.
The device (1) of the invention is intended to be used by dentists, for the restoration of one or more teeth (4, 4′). Thus it is put in place by the dentist, in the mouth of the patient, between two adjacent teeth of which, for example, one (4′) has (5) which must be filled after treatment with, for example, a composite material, such as a photopolymerizable composite, in order to reconstruct the tooth in three dimensions.
Thus, the device (1) of the invention is installed between the two teeth (4, 4′) so that the vertical wall (3) is engaged between the two teeth to be reconstructed, or between the tooth to be reconstructed and the adjacent tooth, such as is illustrated in
The installation of the device (1) is done by deforming the device (1) and in particular by its longitudinal extension. Thus, it is extended along F, by forceps (6) as illustrated in
To this end, each of the end-units (2a, 2b) includes respectively a gripping hole (7a, 7b); each hole is intended to receive the ends (61a, 61b) of the forceps (6) for installation. After insertion, the device is inserted until the lower plane (H) of the device (1) is in contact with the gum (8). In this position, the installation tool Is removed, and the device (1) thanks to its elasticity is placed tightly between the teeth bringing together the two end-units (2a, 2b) which come in intimate contact with the walls of the teeth, such as that is illustrated in
As soon as the tooth is reconstructed and the composite material is polymerized, for example photo-polymerized, it is enough for the dentist to divide the device (1) and withdraw it.
According to a characteristic of the invention, the vertical wall (3) is such that its height (hp) is greater than its thickness (e). According to the preferred embodiment, the height (hp) of the vertical wall (3) is equal to the height of the two end-units (2a, 2b) which have the same height as each other. Thus, the height (ha) of the internal unit (2a) is equal to the height (hb) external unit (2b).
In addition, and as clearly appears in
It is understood in what precedes that the vertical connecting wall (3) extends to a height, on the top (hp) high enough to form by itself a wall for the caries and thus an edge (30), which forms with the hole from the a cavity (50) having a peripheral wall, which cavity (50) the dental surgeon will be able to fill with a anatomic repair material (9). The height (hp) of the vertical wall (3) is, for example, equal to the height of the end-units, and, for example, is between 1 and 8 millimeters, such as, for example, 3 millimeters.
It goes without saying that the height (hp) of the vertical wall (3) can be less than the height (ha) of the internal unit (2a) and/or that (hb) of the external unit (2b) but is still sufficiently high to form, once in a position of restoration and after elongation with the forceps, an edge (30) substantially the same height as the higher edge of the ed tooth before the was removed. Advantageously, in its correct positioning, i.e., when the device is no longer being stretched, the height (hp) of the vertical wall (3) is equal to at least 70% the height (ha, hb) of the end units (2a, 2b) the least important. Preferably, this height will be on the order of 90% the height (ha, hb) of the two units (2a, 2b) when the latter are of the same height.
Each of the units (2a, 2b) is made up of an end wall (21) with a single curved, convex surface, which extends up to two points of inflection (Ao and Bo), which are extended by the two concave side surfaces (22a, 22b) connecting the convex end walls (21) to the vertical wall (3). These two concave surfaces (22a, 22b) are intended to match the peripheral surface between the teeth. The end wall (21) has a single curved and convex surface for each unit (2a, 2b) convex around the line ga, gb is inclined toward the top (
a to 4a and
Indeed, this new end wall (21′) is also curved but has two different surfaces (210′, 211′): a curved and convex surface (210′) located at the top of a curved but concave surface (21′) (
Thus, according to this embodiment, there are four angles of the lower part forming the base of each unit (2a, 2b) have to be removed and the lower surface (211′) forms a chamfer. The shape of the chamfer surface is curved and concave (
The vertical wall (3′) has in this preferred embodiment the form of a triangular corner at the plane of the axis of symmetry (B-B) of the device (
To some extent, the invention as illustrated and the preferred embodiment, primarily propose an elastic matrix between teeth produced as a single part which is preferably made by injection molding.
Number | Date | Country | Kind |
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0413299 | Dec 2004 | FR | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/FR05/01504 | 6/15/2005 | WO | 00 | 9/10/2008 |