Dentistry – Apparatus – Hand manipulatable implement
Reexamination Certificate
1999-11-09
2001-03-27
Wilson, John J. (Department: 3732)
Dentistry
Apparatus
Hand manipulatable implement
C433S039000, C433S139000
Reexamination Certificate
active
06206697
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention refers to a device for the retention and the adaptation of a matrix to the treated portion of a tooth, comprising a tightener clamp for the retention of a matrix, in particular of a proximal matrix system.
U.S. Pat. No. 5,607,302 describes a matrix retainer for dental restorations whose aim is to ensure an optimum contact with the adjacent tooth. This matrix tightener is mainly composed of a ring shaped tightener which operates with strong resilience. Its tips are spherical or cylindrical and correspond to a transversally extending ring, while the tips are anchored by engagement in undercuts of the tooth or by means of a frictional coating. This requires relatively high clamping forces, and the action of the tightener tips upon the matrix is only punctual, so that the resulting adaptation of the matrix to the tooth contour is insufficient. Also, similar products are available where the spherical tips of a tightener act upon a matrix.
SUMMARY OF THE INVENTION
On the background of this prior art, it is the object of the present invention to provide a device for the retention of a matrix for dental restorations which requires a lower contact pressure, on one hand, and on the other hand, which allows a tight lateral adaptation of the adjacent matrix portion, thus avoiding excess filling material mainly in the lateral and in the lateral cervical border area of the cavity.
This object is attained by a device wherein the ends of the tightener clamp are each provided with a wedge-shaped cushion whose point is destined to engage between the treated tooth and the adjacent tooth and which comprises an adaptation element or an adaptation side in order to press the matrix to the contour of the border area of the cavity of the treated tooth in a formfitting manner. Further advantages and embodiments are defined in the dependent claims.
REFERENCES:
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patent: 427338 (1890-05-01), Marshall
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patent: 4715816 (1987-12-01), Mogelof
patent: 5527181 (1996-06-01), Rawls et al.
patent: 5607302 (1997-03-01), Garrison et al.
patent: 6007334 (1999-12-01), Suhonen
Bumgarner Melba
Geno Know-How Sarnen AG
Wilson John J.
Young & Thompson
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