FR2723240A1 - Model tooth for practising dentistry - Google Patents

Abstract

The tooth, comprising a crown (4) and roots (3) is made from a transparent epoxy resin material with an internal pulp (6) reproduced by red wax. The roots contain metal guides which simulate root canals, with access gained to the roots through the pulp cavity. The model can be made in two sections - one for the crown and the other for the roots, joined together to reproduce the exact volume of a tooth. It is mfd. by inserting silicone in a plastic phase in the first part of the mould, inserting the roots and metal guides, and holding the assembly in position until polymerisation has taken place. The second section is made in a similar way and the two joined together.

Description

The present invention relates to a natural tooth reproduction imitating the internal and external anatomies of a tooth, allowing dental treatments to be carried out under conditions identical to those encountered in daily practice.

These reproductions will be used as part of continuing education during postgraduate courses, advanced workshops during congresses, in universities by dental surgery students for their learning of the Dental Art, in private practices by Practitioners in order to improve themselves in the new care techniques presented to them, another use can be found in the realization of models of presentation to patients of the care techniques which are proposed to them.

The use of these reproductions of natural teeth made of transparent epoxy resin, is not limited to endodontics (treatment of the roots of the tooth) but can be adapted to the most common treatments (filling cavities of cavities by all the means made available to the dental surgeon). Reproduction is not limited to dental roots, the natural crown is likewise copied, which makes it possible to work in all areas of dentistry (restorative, endodontics, prosthesis).

The use of these natural teeth reproductions offers the advantage of visualizing the different stages of treatments and protocols for applying dental care techniques (decay cleaning, tooth preparation, filling). The transparent resin reproduces the internal and external anatomies of the natural tooth identically, which are inaccessible to the eye under normal exercise conditions (in the mouth). These transparent resin models will be used for the development of practitioners for the application of new or difficult to use techniques without prior training (sizes of prosthesis spun, inlay-onlay, cosmetic dentistry, endodontics).

Reproductions made of Epoly resin offer all possible types of canal anatomy, all forms of dental roots, all existing situations in clinical practice.

Each copied root is flattened on one of its faces in order to remedy the optical properties of the resin, which could give a distorted image of the internal anatomy. The cutaway (1) is made in the main axis of the channel (2) and is parallel to the main axis of the root (3).

These models are the certified copies of teeth selected for their
anatomies or their peculiarities. Flexible silicone molds are made
for the root part (3) on the one hand, and for the coronary part (4)
on the other hand, so that their association reproduces the exact volume of
selected teeth.

The root part is molded onto the dental roots with the limit
cervical line of the natural crown (anatomical collar 5). Silicone in
plastic phase is placed in a cylindrical container. The root
selected is inserted into the silicone up to the cervical limit (5) and
maintained in this position during the polymerization of the material
molding. Once it has hardened, the root is extracted from the mold thus produced.

 We get the first part of the natural tooth mold.

The crown is molded in the same way by placing the silicone in a
another cylindrical container, into which we insert the clinical crown up to the same cervical limit (5). Once cured, the silicone is separated from
the natural tooth.

After these first two stages, the superposition of the two molds obtained
is checked by placing the cavity of the coronary mold over that of the mold
radicular.

The coronary part (4) of the model reproduces the dental crown with all
its structures: cusps, furrows, dimples and ridges. In the same way the
molding limit is represented by the anatomical collar (5). The cavity
pulp (6) is also reproduced by a small piece of red wax
shaped according to the reproduced tooth (incisor, canine, premolar,
molar) in order to stick as closely as possible to the dental anatomy.

The manufacturing of natural teeth models in resin is done according to
many stages.

One or more smooth metallic and conical stakes are formed according to
the canal anatomy and positioned in the root mold (one per root).

Fixed in the center of said mold and held by a clamp system, its
end crosses the lower part 1u mold, this to achieve the
complete permeability of the channel thus created. This perforation is called the
foramen (7).

The root part is then poured with a transparent quick-setting Epoxy resin. After hardening, the molding is removed, the stake smooth
metal removed. So there remains the certified copy of the dental root
natural (3).

The red wax preform imitating the pulp is placed on the root part, covering the canal orifices (8). It simulates the pulp volume (6) that one wishes to reproduce.

The mold of the coronary part is filled with transparent Epoly resin. The root part carrying the wax preform is positioned directly above the coronary mold in order to restore the dental unit and the alignment of the corono-radicular axis.

After hardening, the part is removed, deburred and then polished.

The finished model is presented as a transparent natural tooth in which we can see the root canals (2), the pulp volume (6) and the canal outlets (7).

Each type of tooth is thus reproduced. A full arch of thirty two teeth can be made for demonstration models or to get even closer to clinical treatment conditions.

Claims (8)

1 / Device reproducing as close as possible to reality the dental organ as a whole crown (4) and roots (3) characterized in that it is made of transparent epoxy resin. 2 / Device according to claim 1 characterized in that the pulp volume (6) is reproduced inside the resin tooth by a mass of red wax representing the pulp of the natural tooth. 3 / Device according to claims 1 and 2 characterized in that access to the root canals (2) is through the interior of the pulp cavity (6). 4 / Device according to claim 1 characterized in that the internal anatomy of the roots (3) is reproduced by means of metal stakes simulating the root canals (2). 5 / Device according to claim 4 characterized in that the permeability of the root canal (2) is obtained by the metal support at the end of the dental root (3). 6 / A method of producing a device according to claim not characterized in that it consists in using a mold in two parts, one for the root part (3), the other for the coronary part (4) of so that their association reproduces the exact volume of the chosen teeth. 7 / production method according to claim 6, characterized in that it consists of placing silicone in the plastic phase in the first part of the mold, inserting the selected root in the silicone up to the cervical limit (5), to position several tapered smooth metal stakes due to one per root and to maintain them by a system of clamps, the end of each stake crossing the lower part of the mold in order to achieve the complete permeability of the channel thus created, to maintain the together during the polymerization of the molding material and to extract the root of the mold once it has hardened. 8 / A method according to claim 6, characterized in that it consists in placing silicone in the plastic phase in the second part of the mold, in inserting the clinical crown up to the same cervical limit (5), in positioning the pulp cavity represented by a piece of red wax, and superimposing the two parts of the mold obtained to reproduce the chosen tooth.