Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1988-07-12
1990-09-18
Stone, Cary E.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433177, 433181, 433189, 433192, A61C 13225
Patent
active
049574388
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase of PCT/DE87/00547 filed 25 Nov. 1987 and based, under the International applications P 36 40 163.3 filed 25 Nov. 1986, P 37 07 483.2 filed 9 Mar. 1987 and P 37 39 646.3 filed 23 Nov. 1987.
FIELD OF THE INVENTION
The invention relates to a dental coupling assembly and method of applying same. A prior art dental coupling assembly is known from German Patent 35 25 298. Another dental coupling assembly is known from the German open application 34 32 486. A common feature of this state of the art is that the coupling assembly serves for a connection--which is first loose but can be locked in position with a hardenable mass--between a dental prosthetic structure and one of the two parts --male or female--of a dental attachment or of an anchoring device. Thereby, an insertion--or retention part is provided with outer shell surfaces and is insertable into a hollow holding recess with play and is movable within the holding recess with the tolerances desirable for the attachment--and prosthesis-ancharing techniques, prior to the introduction of a hardenable mass. The outer shell surface of the retention part has at least two partial outer shell surfaces, which are inclined with respect to the median axis of the recess and parallel with respect to the partial inner-shell surfaces of the recess.
OBJECT OF THE INVENTION
While the known coupling assembly (German Patent 35 25 298) has performed well in practice, the invention has and its object to improve the known dental coupling assembly in such manner that can be possible in any case to produced with less effort and that, in will facilitate the work done in the patient's mouth for its insertion.
SUMMARY OF THE INVENTION
This object is achieved by providing a dental coupling assembly with a brace attachable in the mouth of the patient to which a metal holding part optionally formed by a model of synthetic material burning off without residue, is fastened or can be fastened, having a recess with a continuously closed inner shell surface, and wherein a retention part is held with the aid of an adhesive, particularly a hardening cement, whereby the recess is enlarged in comparison to the outer volume of the retention part by a space affording free play to the retention part, and with a complementary coupling part provided with a dental-prosthesis structure, which engages with the retention part with at least one detachable coupling connection. According to the invention, the recess and retention part have over the entire extent of their axial length the inner wall surface or the outer wall surface of a straight (right) circular cylinder. The recess is closed at its one inner frontal side with an inner bottom surface and the retention part is closed by an outer bottom surface facing the inner bottom surface.
Thus, the recess and the retention part each represent over the entire axial extent an inner shell or wall surface and the outer shell or wall surface of a straight (right) circular cylinder. In addition, the recess is closed by an inner bottom surface at one of its inner frontal ends, while the retention part is closed by an outer bottom surface facing the inner bottom surface.
The recess according to the invention, wherein the retention part to be cemented is received with spatial play, is, for instance during repair in the patient's mouth, particlualrly easy to make, with a cylindrical instrument (cylindrical cutter or ther like). Such a straight circular-cylindrical recess in the case of a holder model burnable without residues, can be made as a plastic part through die casting, which is easily extracted from the mold from the point of view of the tools.
Surprising in the case of the coupling assembly of the invention is the fact that with a recess that is not undercut (compared to German Patent 35 25 298 and German open specification 34 32 486), it is possible to raise the required thrust force for the locking between the retention part and the complementary coupling part (e.g. f
REFERENCES:
patent: 4530663 (1985-07-01), Pornoy
patent: 4711631 (1987-12-01), Thomson
Ceka N.V.
Dubno Herbert
Stone Cary E.
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