Dentistry – Method or material for testing – treating – restoring – or... – Crown
Patent
1996-03-22
1998-11-24
Lucchesi, Nicholas D.
Dentistry
Method or material for testing, treating, restoring, or...
Crown
4332021, 433223, A61C 508
Patent
active
058399003
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a dental prosthesis such as a crown, a bridge, an implanted prosthesis, an artificial tooth or removable appliance, i.e. a prosthesis intended to reconstitute the shape and characteristics of at least one tooth from a natural stump (a crown fitted in the mouth on the original tooth), an implant abutment (a crown fitted on an implant in the mouth) or laboratory model representative of the soft tissues (denture).
BACKGROUND
Known dental prostheses are achieved in the form of a framework in a single part made of metal or composite material (WO-A-8,904,640) or resin, or with a generally metallic shell or armature covered with ceramic or resin. Also FR-A-2,588,181 recommends the use of composite material to achieve posts for inlays cores, shells, bridges or implants.
In the former art, it was always sought to manufacture these prostheses, and more particularly their internal constituting elements (shells, metallic frameworks, posts, shells . . . ), from as rigid materials as possible. Thus, WO-A-8,904,640 recommends that dental prostheses be manufactured from a composite material with a greater rigidity and strength and more generally with higher mechanical characteristics than those of the polymers generally used. More particularly, this document recommends that a composite material with an elasticity modulus higher than 3.45 GPa be used. Also, FR-A-2,588,181 recommends the use of composite materials reinforced by high strength fibers, notably carbon fibers with a matrix more particularly made of epoxy resin or polyester in order to give the prosthesis a high stiffness. The well-known essential qualities of a tooth or of a dental prosthesis are in fact on the one hand not to break due to the effect of impacts and on the other hand not to wear too quickly. But up to now it has essentially been sought to strengthen the rigidity of the prostheses in order to achieve these qualities.
Nevertheless, entirely metallic prostheses are unaesthetic, prostheses made entirely from resin prove fragile in use, those achieved by a metallic shell or armature covered with ceramic are extremely costly, long and delicate to manufacture, and those achieved from a metallic framework or armature covered with a resin are also long to manufacture and subject to deterioration in use on account of the poor adherence of the resin on the metal armatures or shells and of the concentration of the stresses at the interfaces of materials having very different mechanical characteristics (metal/resin).
SUMMARY OF THE INVENTION
The inventors have however determined that to have satisfactory mechanical qualities, a dental prosthesis must imitate or reproduce as close as possible the natural tooth which comprises a pulp cavity surrounded by dentin and an enamel coating. Thus, it is important that the prosthesis be made up of two distinct parts whose mechanical characteristics are different, i.e. a hard coating resistant to abrasion, and a support shell or armature whose characteristics are determined in such a way that the hard coating does not break, and that it be rigidly associated to the stump while reproducing the dynamic and static mechanical characteristics of the natural tooth.
Accordingly it is an object of the present invention to propose a dental prosthesis comprising a support shell and an external finishing coating covering this support shell which does not present the above-mentioned shortcomings of the state of the technique, i.e. with which the coating adheres perfectly to the support shell, the respective mechanical and physico-chemical characteristics of the coating and support shell being able to be determined independently from their respective stresses proper.
Another object of the present invention is to propose a dental prosthesis which reproduces the mechanical characteristics of the natural tooth as far as possible, and which is in addition biocompatible and easy to manufacture.
A particular object of the present invention is to propose a dental prosthesis which is per
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Billet Gilles
Clunet-Coste Bruno
Maneuf Bernard
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