Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
1999-12-10
2001-02-20
Wilson, John J. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
Reexamination Certificate
active
06190169
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention refers to an anchorage for dental prosthetics, comprising a male member which is attachable to a tooth and provided with a head, and a female member which is attachable to a dental prosthesis. An anchorage of this kind having a ball head is being marketed by the applicant in the form of a resilient anchorage according to Dr. Dalla Bona under the commercial name DALBO. In the case of resilient anchorages comprising ball heads, it is relatively difficult to adjust the retention force, and different solutions have been suggested, e.g. the use of spring-loaded balls, amongst others. In one of the commercial embodiments, the female member is provided with lamellas.
SUMMARY OF THE INVENTION
On the background of this prior art, it is the object of the present invention to improve a resilient anchorage comprising a head in such a manner that an easily and safely adjustable retention is obtained. This object is attained by an anchorage wherein the female member comprises an internal thread and a lamellar insert receiving and retaining the head of the male member, the retention force of the lamellar insert being continuously adjustable by rotation thereof. Further developments of the invention are defined in the dependent claims.
REFERENCES:
patent: 3991472 (1976-11-01), Lukesch
patent: 4547156 (1985-10-01), Hader
patent: 4573923 (1986-03-01), Poveromo
patent: 5417570 (1995-05-01), Zuest et al.
patent: 380292 (1964-09-01), None
patent: 633440 (1982-12-01), None
Bluemli Markus
Buchholz Alexis
Kaufmann Heiner
Bumgarner Melba
Cendres ET Metaux SA
Ostrolenk Faber Gerb & Soffen, LLP
Wilson John J.
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