Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1985-06-28
1987-12-08
Peshock, Robert
Dentistry
Prosthodontics
Holding or positioning denture in mouth
A61C 1322
Patent
active
047116315
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to an arrangement for joining denture components which are to be located laterally with respect to one another, in particular a prosthesis component with an anchoring or bedding part, by adhesion, consisting of a pair of connecting elements or model parts which are joined to or can be joined to the components to be joined, at least one of which encloses the other.
By denture components which are to be located laterally with respect to one another there are to be understood those which, in a projection on the bite plane, lie at different points (not on top of one another). The joining of such denture components therefore presents problems, because on the one hand the laterally displaced denture components are exposed to forces of different strength and acting in different directions and the joint therefore has to take up forces of the most diverse nature and direction (including flexural and tensile forces), and because on the other hand the joint must exactly fulfil the fitting requirements which the joined denture components meet in the jaw.
In denture technology, it is frequently necessary for denture components which belong together to be produced separately, either because this is required due to the production or fitting technique or because, as prosthesis components which can be removed, it must also be possible to separate them from the fixed anchor during use.
In all of these cases, it is of extreme importance that their mutual joining exactly meets the dimensional conditions determined by the anchors or abutments present or by the shape of the jaw. In practice, great difficulties are encountered in meeting this requirement. On the one hand, even in the production of the individual components, tolerances cannot be reliably excluded on the path between impression and production of the finished cast component. On the other hand, conventional joining by soldering is a frequent reason for deformations because of the unavoidable heat expansions, which may differ. Other problems arise with this conventional joint in that stresses are caused during soldering which are "frozen" in the casting operation. Even if individual pieces which fit exactly, together with intermediate members, are soldered together to give, for example, an extended bridge, it is entirely possible for inaccuracies in fit to result from the soldering operation (Bottger, Grundler: "Das zahnarztliche and zahntechnische Vorgehen beim Teleskopsystem in der Prothetik (Dental and dentistry procedure in the telescopic system in prosthetics), Munich 1970, pages 73 and 110). In practice, such deformations are only too frequently not discovered or not taken into account by the dental technician or dentist and then become the source of great discomfort to the patient. Adhesive jonts have been disclosed to avoid these disadvantages (Geiger: "Geschiebetechnik" (Bedding Technique), page 167 et seq.). A secondary bedding component is here provided with an adhesive pin, whilst the prosthesis component to be joined is provided with a matching eye, which is shaped by shaping the model on the adhesive pin, coated with a thin layer of wax. The adhesive pin and eye essentially match one another in the same shape, i.e. the mutual position of the secondary bedding component and prosthesis component is determined by the surface portions of the adhesive peg and the eye to be connected by adhesion. Subsequent correction is not evisaged. Another disadvantage of the known technique is that the adhesive peg must first be modeled and cast before the component to be joined thereto can be modeled.
A false tooth is also known (German Offenlegungsschrift No. 2,247,649), which consists of a root section and a crown joined to one another via an elastomeric, optionally prefabricated intermediate layer. Because these components lie over one another in the projection at the occlusal plane and therefore essentially only pressure forces are transmitted, the intermediate layer does not have to be stuck and can therefore be prefabricated, cohe
REFERENCES:
patent: 1471754 (1923-10-01), Rosenblum
patent: 2617194 (1952-11-01), Clark
patent: 4362509 (1982-12-01), Sule
patent: 4380436 (1983-04-01), Kipp
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