Dentistry – Apparatus – Work support
Patent
1989-06-22
1992-04-21
Stone, Cary E.
Dentistry
Apparatus
Work support
433 60, 433 71, 433 75, A61C 1100
Patent
active
051062968
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for definition of different positions of a model of the lower jaw relatively to a model of the upper jaw according to the preamble of the accompanying claim 1.
The present invention relates to a device for the accomplishment of the method according to the preamble of the accompanying claim 6.
BACKGROUND
In connection with production of dental works there is sometimes required an orientation of the lower jaw model to the upper jaw model in one or several positions. By mounting the models within an articulator one aims at simulating the patients positions of the under jaw relatively to the upper jaw. By artificial jaw condyles the models are brought into different positions relatively to each other. To completely reproduce the motion pattern of the patient in this way is very difficult, as the anatomy is individual.
By means of wax bite a good orientation of the model can be accomplished. In connection with some dental works, such as bridges and positioners, the teeth are changed as to shape and/or positions so that the orientation of the upper jaw and the lower jaw models must freely be transferred to other media, usually articulator with artificial jaw condyles.
It is easy to mount the models in an articulator so they take one single position. In connection with production of bridges and positioners there are required several positions. To reproduce these positions in connection with artificial jaw condyles is complicated and non-exact.
The Object of the Present Invention
The object of the present invention is to accomplish a method and a device which facilitate reproduction of different positions between upper jaw and lower jaw models.
The Present Invention
Said object is achieved by means of the method according to the present invention the characteristics of which are apparent from the accompanying claim 1 and 6 respectively.
The method according to the present invention can be summarized so, that one in a divided lower jaw model (so called split cast) pushes in an individually shaped plaster plate (wafer). The under jaw can take different positions with respectively without wafer. Further positions can be taken by means of further wafers.
The method according to the present invention is developed for the production of positioners, but can be utilized also in connection with analysis of bite motions and production of bridge works. The method involves good possibilities for checks.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will in the following be described in an embodiment with reference to the enclosed drawings, in which
FIG. 1 shows an upper jaw model and an under jaw model in a completely schematically shown articulator in connection with the use of the method according to the invention,
FIG. 2 shows a bottom plate, which forms a bottom part of the under jaw model,
FIG. 3 shows a so called set-up model,
FIG. 4 shows the jaw models in a closed position in the articulator,
FIG. 5 shows the set-up model in a closed position in the articulator and
FIG. 6 shows a view of the rear plane of an interlayer plate formed by means of the method according to the present invention.
FIG. 7 shows the set-up model having the interlayer plate removed and the interspace between the toothed arches filled with wax and
FIG. 8 shows the wax impression positioned between the jaw models of a duplicate of the set-up model.
FIG. 9 shows a measuring tooth for the use in connection with the production of jaw models,
FIG. 10 shows an impression of a toothed arch and
FIG. 11 shows the use of the measuring tool for measuring in connection with casting the impression.
FIG. 12 shows a partly broken view through a connection device for jaw models into the articulator,
FIG. 13 shows a planar view over a part of the articulator,
FIG. 14 and 15 shows schematically the preparation of the connection device .
PREFERRED EMBODIMENTS
In FIG. 1 an upper jaw model 1 and a lower jaw model 2 are shown, which models constitute castings of upper and lower toothed
REFERENCES:
patent: 2386103 (1945-10-01), Galley
patent: 2540555 (1951-02-01), Slaughter, Jr.
patent: 2754588 (1956-07-01), Cordell
patent: 3510947 (1970-05-01), Tuccillo et al.
patent: 4319875 (1982-03-01), Beckwith
Andersson Carl-Arne
Varde Per
Stone Cary E.
Varde Margareta
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