Education and demonstration – Anatomy – physiology – therapeutic treatment – or surgery... – Anatomical representation
Reexamination Certificate
2000-04-06
2001-07-10
Ackun, Jr., Jacob K. (Department: 3712)
Education and demonstration
Anatomy, physiology, therapeutic treatment, or surgery...
Anatomical representation
C434S263000
Reexamination Certificate
active
06257895
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a jaw model for demonstrating dental work, with a main body which is designed in the manner of a jaw arch and has a multiplicity of bore holes for receiving post-shaped anchoring parts which can be used as imitation tooth stumps.
A jaw model of the above type is known from WO 84/03978. In the known model, depending on the type of prosthetic dental work, posts already connected to the workpieces or intended to be connected to them can be inserted, from that side of the main body directed towards the oral cavity, into bore holes provided in this main body. In order to be able easily to remove the posts or the individual teeth, bridges, etc. connected to them, the bore holes are continuous holes and the posts are made so long that they project beyond the edge of the respective bore hole on that side of the main body directed away from the oral cavity. Consequently, it is possible, if so required, to exert pressure on those ends of the posts protruding beyond the edge of the bore hole.
From U.S. Pat. No. 4,840,565 it is also known, in the case of a jaw model, for posts already connected to prosthetic workpieces to be locked in the bore holes provided for them. For this purpose, the posts are provided with transverse bore holes for receiving locking pins which hold the prosthetic workpiece in its intended position relative to the jaw arch. In this case too, the bore holes are continuous and the posts are sufficiently long for them to be removed again in the same way as the posts in the known jaw model described above.
SUMMARY OF THE INVENTION
The known models are not entirely satisfactory. Thus, in both solutions, not only is the application and removal of the posts comparatively awkward and time-consuming, there is also the risk that posts or the prosthetic workpieces securely connected to them and consisting of individual teeth will be lost. The invention is based on the object of making available a jaw model of the generic type in question which permits convenient, quick and clear presentation of different possible solutions for securing dental prosthetic workpieces on an upper or lower jaw. According to the invention, this object is achieved by the fact that anchoring parts are guided non-removably in the bore holes and, by means of a spring acting on them, can be transferred from a first locked position into a second locked position and, when the force of the spring is overcome, can be transferred from the second locked position back into the first locked position, their end in the first locked position being flush with the surface of the main body, while in the second locked position it projects above the surface of the main body.
The jaw model according to the invention is extraordinarily easy to use and is suitable not only for providing explanations to patients, but also for training students and dental technicians. Because of its convenience, it permits alternatives to be sought for attaining an optimum solution.
REFERENCES:
patent: 1948059 (1934-02-01), Baugh
patent: 2812578 (1957-11-01), Weidenhamer
patent: 3286350 (1966-11-01), Cooper
patent: 3458936 (1969-08-01), Schulz
patent: 3787979 (1974-01-01), Acevedo
patent: 3908272 (1975-09-01), Arnold
patent: 4840565 (1989-06-01), Poveromo
patent: 4846684 (1989-07-01), Oesterich
patent: 4902232 (1990-02-01), Neustadter
patent: 4969820 (1990-11-01), Oesterich
patent: 5030102 (1991-07-01), Lang
patent: 10-8403978 (1984-10-01), None
Ackun Jr. Jacob K.
Fernstrom K
Stone Mark P.
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