Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
1999-08-05
2001-06-05
Manahan, Todd E. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
Reexamination Certificate
active
06241523
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a retainer for dental prostheses. Removable dental prostheses are currently known which are provided with retainers that allow to anchor them to residual dental structures. In particular, retainers are known which provide for a spherical male element, which is rigidly coupled to a fixed part of the prosthesis applied in the gum region or to a crown which is fixed to a tooth, and for a complementarily shaped female element, for example a plastic cap which is meant to be stably accommodated in the removable part of the prosthesis.
The male element is formed by a body having a threaded stem which is meant to be screwed or cemented in a corresponding implantation seat of the prosthesis. The implantation seat is constituted, for example, by a substantially tubular implant which is axially provided with a threaded hole for the screwing of the stem.
One of the problems observed in the use of said retainers is constituted by the difficulty in providing a correct mutually parallel alignment of the roots or implants.
Another drawback observed in the use of the retainers is the gradual wear to which the male element is subjected. This reduces the friction of the initial coupling between the male element and the female element that is coupled thereto, severely damaging the functionality of the coupling.
SUMMARY OF THE INVENTION
The aim of the present invention is to solve the above-mentioned problem, by providing a retainer for dental prostheses which allows to provide the correct mutually parallel alignment of the roots or implants and to ensure high functionality, particularly allowing to obviate wear and the like.
Within the scope of this aim, an object of the present invention is to provide a retainer for dental prostheses which is simple in concept, very tough, safely reliable in operation and versatile in use.
This aim and this object are both achieved, according to the invention, by the present retainer for dental prostheses, comprising a spherical male element, which is rigidly fixed to a body meant to be rigidly coupled to a corresponding implantation seat of the prosthesis, and a complementarily shaped female element, which is meant to be stably accommodated in a removable part of the prosthesis, comprising a spherical hollow part which is complementary to said female element and is suitable to be applied to said spherical male element and be fixed to said male element in the correct position for coupling to said female element.
REFERENCES:
patent: 4973249 (1990-11-01), Silvio et al.
patent: 5133662 (1992-07-01), Metcalfe
patent: 5211561 (1993-05-01), Graub
patent: 5520540 (1996-05-01), Nardi et al.
Josif Albert
Manahan Todd #E.
Modiano Guido
O'Byrne Daniel
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