Dentistry – Apparatus – Work support
Patent
1998-03-05
2000-02-08
Wilson, John J.
Dentistry
Apparatus
Work support
A61C 114
Patent
active
060222158
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method ensuring the production of a stress-free implant-supported superstructure and/or its support frame by means of an individual support element as well as by means of an individual support element for a metal frame of a superstructure during a heat treatment step or the firing of ceramic material.
BACKGROUND OF THE INVENTION
For supplying a patient with prosthesis it is known to insert implant bolts into his jawbone, with a superstructure being fitted thereon, which is faced e.g. with ceramic material (having the color of the teeth). The common procedure is to take an impression by means of an individual spoon after having implanted the bolts, which shows the situation in the patient's mouth, in particular the shape of the jawbone, of the mucosae a.s.o. as well as the position of the implanted bolts. For this purpose, transfer jigs are fitted to the implanted bolts in known manner, which are then embedded in the impression of the individual spoon. Subsequently, model implants are screwed into the transfer jigs thus allowing to prepare a master model into which the model implants are embedded in the same manner as the implant bolts are in the patient's jawbone. Using said master model, the superstructure is molded from wax casted in a casting process, using conventional auxiliary elements.
These process steps are known from the state of the art so that a more detailed description thereof can be dispensed with.
The casted raw superstructure is soft and moldable to a certain extent due to the metal alloys used (e.g. gold alloys). The superstructure furthermore shows deformations caused by the cooling and shrinking processes during the casting step, so that generally it will not exactly match the master model. It is known from the state of the art to divide the casted superstructure and solder it in appropriate manner, in order to make it match again. This, however, turned out to be insufficient, as during the subsequent processing of the superstructure and when facing it with facing material, e.g. ceramic material, deformations occur again. It is therefore known from the state of the art that, as a result, the superstructures are to be reworked in order to make them fit. On the one hand, this requires a high expenditure of work in a laboratory, on the other hand it cannot be ensured that the superstructure can be fitted to the implanted bolts of the patient without any problems. In unfavorable cases the superstructure is to be reworked in a dental laboratory or the entire superstructure is to be produced anew.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing a method of producing an implant-supported superstructure which allows the production of fitting superstructures in simple manner and allowing simple handling liable in operation.
The invention is based on the further problem of providing a support element for performing the process, which element is simple and inexpensive in construction and the use of which incurs no difficulties.
Therefore it is the object of the invention to create a method of producing an exactly fitting implant-supported superstructure, wherein the inaccurately shaped superstructure or its support frame is made to fit by means of an individual passivation tray. It is also an object of the invention to construct said support element in a manner that it can be used for the ceramic facing of the superstructure, avoiding distortion of the superstructure from the heat treatment when firing the ceramic material.
According to the invention the problem of the method is solved by producing a heat-treatment model imitating the situation in a patient's mouth reproduced by the master model, with model anchors being inserted into the heat-treatment model in the same manner as the model implants, and by screwing the casted superstructure and/or its support frame to the heat-treatment model, subjecting it to a heat treatment thereafter. Thereby the superstructure and/or the support frame are formed to exactly m
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patent: 4136449 (1979-01-01), Penrod et al.
patent: 4184840 (1980-01-01), Gamberg et al.
patent: 4227874 (1980-10-01), Nugent
patent: 4634561 (1987-01-01), DeLuca
patent: 5419700 (1995-05-01), Sillard
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