US2525962A - Artificial tooth - Google Patents

Description

0ct. 17, 1950 s. I. SILVERMAN ARTIFICIAL TOOTH Filed Dec. 13, 1946 '0 I m 3 W m 12 i w VAA V I 10 INVENTOR. SIDNEY I. SILVER/WAN.

Patented Oct. 17, 1950 OFFICE ARTIFICIAL roo'rn I Sidney I. Silvermanjlirooklyn, NQY.

Application December 13, 1946, Serial No. 715,977

1 Claim. (01. 32--8) This invention relates generally to the construction of artifl-cialteeth, but more particularly to a means and method used inthe construction of both dentures and teeth and the articulation'of the latter.

One object of the invention is to increase efficiency and skill in denture service, particularly for the war casualty.

Another object of the invention effects a reduction in adjustment time for each denture patient, reducing the use of dentists time, equipment and space. 1 i

A further object of the invention is that it effects a reduction in expenditure of man hours of dental technicians.

Another object of the invention is that it reduces the cost of the artificial teeth and also reduces stock inventories of artificial teeth.

Still another object of the invention is to obtain a more perfect articulation between upper and lower dentures.

Referring to the figures in which like parts are represented by similar reference characters:\

Figure 1 isa side elevation of an articulator showing the teeth and rings set up in wax;

Figure 2 is a sectionized elevation showing the wax denture inclosed within the investment flask, the section being taken through rings on upper right and left molars;

Figure 3 is a sectional view of the investment flask opened after having eliminated the wax,

and showing the rings retained within the plaS- ter;

Figure 4 is a perspective illustrating the ring construction;

Figure 5 is a sectionized view of a molar showing the improved cusp formation, the section being taken on a buccal-lingual plane;

Figure 6 is a top plan view of the tooth showing the occlusal surface of the tooth illustrated in Figure 4;

Figure 7 is an elevation of the tooth illustrated in Figure 4 showing a buccal-lingual view;

Figure 8 is an elevation of the tooth illustrated in Figure 4 showing a mesial-distal view; and

Figure 9 is a sectionized view of the ring tooth, the section being taken at the ridge lap.

Briefly stated, the invention relates to a method and means for forming artificial teeth in which the side walls of a tooth are formed by a prefabricated ring which surrounds a core, the core being formed integral with the denture and extending beyond the ring to include the occlusal surface. The ring and the core are formed of the same material and the portion of the core which extends beyond the ring andon which are formed the cusps is of plastic which matches the rest material. :Inthe formation the Wax cusps H are placed on a prefabricated plastic ring l2which has the contours of the buccal, lingual and proximal surfaces of various molds and shades of artiflcial teeth. The plastic ring l2 iswprovided with a central channel it which is beveled at one end as indicated by the numeral [4. The Waxcusps H are contiguous with the Wax which fills the hollow plastic ring i2. The wax within the plastic ring completes the ridge lap surface 10f the tooth.: i

The following procedure is recommended for the establishment of the cusp inclinations for each occlusal relationship. An upper set of teeth with preformed cusps with 10, 20, 30 or 40 degree cusp inclinations is matched by the lower wax cusped teeth withcorresponding cusp inclinations. The teeth are set up on the articulator l5 with the vertical dimension opened to 1 millimeter, which is accomplished by setting the adjustable stop member 16 to provide this clearance. The teeth may then be recontoured in the mouth or on the articulator by directing either the jaw or the articulator through all the occlusal excursions until the vertical dimension has closed down the height it was originally opened. Satisfactory guides are available to control the degree of closure of the vertical dimension. I

The teeth may be set up and contoured on base plate wax and the denture base and cusps be processed in one investment. When the denture case is invested and the wax is boiled out the occlusal surface may be packed with acrylic resin or any other plastic through the hollow center or channel [3 of the tooth. The cusps may be packed from either the'occlusal or ridge lap side of the tooth.

The tooth can be made in all molds and shades which the dental profession uses. The design of the tooth is adapted to the mold of each of the 28 natural teeth which the dental profession replaces. The teeth can be used for replacing edentulous mandibular and maxillary restorations, partial dentures and fixed bridge restorations. The plastic rings 12 with wax cusps are easily and quickly produced and standardization of a mean cusp reduces the supply problem considerably. The manufacturing cost of the rings is low and the procedure followed for the formation of the dentures is simple, and includes the following operations in the order specified below:

1. Impressions of the mouth of the patient are made in the usual manner;

2. From the impressions the customary plaster models are made, on which are formed wax dentures provided with built-up wax rims (not shown). These dentures are tried in the patients mouth to obtain a bite record as in the ordinary procedure;

3. After fitting these wax dentures in the patients mouth and adjusting them to the proper bite, they are mounted on the articulator l5, and the stop member N of the articulator set so that there will be a clearance between the rims of /2 to 1 millimeter;

4. On the articulator the wax cuspid teeth rings are set up in position and opposite fully fabricated plastic teeth, with any degree of cusp heights suitable to requirements of the patient, are set to articulate with the wax teeth;

5. Wax cusps are molded into proper shape by excursions of the natural jaw or by movement of the articulator arms until the bite is closed to the M to 1 millimeter it was opened on the articulator;

6. Molding in the mouth with the use of a central bearing point device automatically corrects the centric record;

7. The opposite or fully fabricated denture is processed in the regular manner. The base with the wax cuspid teeth (ring teeth) is similarly invested in a flask l! (Figs. 2 and 3) as for a routine denture;

8. When the wax is boiled out the rings are retained in the investment plaster, as shown in Figure 3; and

9. The cuspid area which was in wax before the wax was eliminated from the flask is packed with plastic materials which the dental profession uses for the manufacture of artificial teeth and the ring may be arranged in either the upper or lower denture or in both so long as the tooth opposite the ring tooth is either a complete artificial tooth or a natural tooth from which the cusps of the ring tooth may be formed as described above. 7

Having thus described my invention, what I claim as new and wish to secure by Letters Patentis: a 7

As an article of manufacture, an artificial tooth comprising an anatomically-configured body including a plastic prefabricated ring section having buccal, lingual,proximal and gingivalsurfaces and a central through opening beveledvat one end toward the occlusal surface; and a temporary removable core of malleable, Wax in said opening, said 'core extending beyond the ring at one end to facilitate the formation of the correct cusped occlusal surface.

. l SIDNEY I. SILVERMAN.

REFERENCES. CITED The following references are of record in the file of this patent:

1 UNITED STATES PATENTS Number Name Date 2,036,678 Blake Apr. 7, 1936 2,154,499 Eisenstein Apr. 18, 1939 2,367,767 ,Gale Jan. 23, 1945 2,420,570 Shapiro May 13, 1947 2,431,086 Safiir Nov. 18, 1947

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