Dentistry – Apparatus – Work support
Patent
1984-11-26
1985-10-15
Wilson, John J.
Dentistry
Apparatus
Work support
433 56, 433 65, A61C 1900
Patent
active
045471541
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for the encapsulation in plaster of models of the jaw for the manufacture of dental prostheses. More particularly, it relates to such a device useful in producing a prosthesis of the type having an articulator which has a lower model support for a lower-jaw template and an upper model support for an upper jaw template, the upper model support being swingable relative to the lower model support around a horizontal axis, the condylar axis.
BACKGROUND ART
For the production of a prosthesis it has heretofore been generally customary for a dentist to take a manual impression of the bite, by which he determines, without the aid of instruments, the association between the lower jaw and the upper jaw. A template with wax occlusal guides is made in the toothless mouth of the patient, the guides representing the two rows of teeth. For the manufacture of the prosthesis, the two templates are fastened to the upper and lower model supports, respectively, of an articulator in a dental laboratory. In most cases these articulators are so-called average value articulators with which the plane of the bite is determined.
The object of the present invention is to so improve a device of the aforementioned type that a prosthesis which is adapted to the individual patient and is designed to conform to his particular bite plane, can be produced by means which are relatively simple and easy to handle.
Other objects and advantages of the invention will be apparent from the following detailed description of a preferred embodiment thereof.
DISCLOSURE OF THE INVENTION
In accordance with the present invention, the preceding objects are achieved employing a frame having a bottom plate for setting up the articulator, a fastening device for fixing the condylar axis relative to the bottom plate, and a table which is parallel to the bottom plate and whose upper surface determines the bite plane and is adjustable vertically and sagitally with respect to the condylar axis.
The invention provides the dental technician with an apparatus which may be employed with conventional commercial articulators, and be utilized to adjust the condylar axis. By displacement of the table in vertical and sagittal directions corresponding to the data measured on the individual patient, the bite plane can be determined individually.
For the determination on the patient of the data necessary for the adjustment of the table there is used a U-shaped bite fork, the arcuate vertex of which is connected to a front strip which can be aligned parallel to the bipupillary line and which passes on both sides into respective arms, which arms can be aligned parallel to Camper's line. In accordance with preferred forms of the invention, one arm bears a measurement scale whose zero point is on the top side of the arm and corresponds to the arcuate vertex of the bite fork; and a slide, which bears a vertically extending measurement scale, is displaceable on one arm.
BRIEF DESCRIPTION OF DRAWINGS
Further features and advantages of the invention will become evident from the following description of the preferred embodiment illustrated in the drawings, in which:
FIG. 1 is a side elevation of a human head, serving to show the bite plane and Camper's plane;
FIG. 2 is a front elevation of the head, showing the bipupillary line;
FIG. 3 is a perspective of the lower jaw of a human with the corresponding coordinate system;
FIG. 4 is a top view of a bite fork according to the invention;
FIG. 5 is a side view of the bite fork;
FIG. 6 is a perspective of a conventional, commercial average-value articulator;
FIG. 7 is a perspective of a frame according to the invention, adapted to receive an articulator; and
FIG. 8 is a side elevation, on a reduced scale, of the frame of FIG. 7.
FIG. 1 shows, in side elevation, a human head with the so-called Camper's plane 10 illustrated. The Camper's plane 10 is an imaginary plane which extends through the two condyle points 12 and the subnasal point 14. It is approximately parallel to th
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patent: 3439421 (1969-04-01), Perkowski
patent: 3693260 (1972-09-01), Hernandez
patent: 3808688 (1974-05-01), Guichet
patent: 4155163 (1979-05-01), Schwartz
patent: 4189835 (1980-02-01), Seldin
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