US1217866A

US1217866A - Artificial tooth.

Info

Publication number: US1217866A
Application number: US85992214A
Authority: US
Inventors: Otto G Hess
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-09-02
Filing date: 1914-09-02
Publication date: 1917-02-27
Anticipated expiration: 1934-02-27

Description

0. G. HESS. I

ARTIFICXAL TOOTH. APPLICATION HLED SEPT. 2. m4.

Patented Feb. 27, 1917.

I Toall whom it may concern: I

Be it known that I, O'rro G. Hess, a citizen of' the United States, residingat Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Artificial Teeth, of which the following is a specification.

This invention relates to artificial toothor' bridge work in which a porcelain facing is rovided for thetooth or. bridge.

y principal object is to'make the best possible joint betweenthe metal backing and the porcelain facing, and at the same time have the facing hide the backing.

The accompanying drawings illustrate the invention. 7

Figure 1 is a perspective view of an artificial tooth constructed in accordance with this invention and adapted to be applied as a crown.

Fig. 2 is a perspective view of the facing and crown backing shownin Fig. 1.

Fig. 3 is an enlarged view of the posterior side of the facing, dotted lines indicating the proportional relative depth of the re-' taining grooves.

Fig.4 is a side elevation of the tooth shown in Fig. 1.

Fig. 5 is a vertical section of the tooth as ihown in Fig. 1 on line indicated by a Figs. 6, 7 and 8 are cross sections respectively of the artificial tooth on lines w, w" and m Figs. 4 and 5.

Fig. 9 is a section of the backing on line at, Figs. 4 and 5, omitting the porcelain facing. J

Fig. 10 is a view of the tooth, looking at the cutting edge from line ai -90", Fig. 4.

Fig. 11 is a view analogous to Fig. 10 omitting the facing.

The application of the inventiomto bridge work will be obvious to those skilled in the art, upon examination of thesaid figures and from the following descriptlon.

Arrows on the hues of sections indicate the direction of sight. I

The artificial tooth 6 consists of the two principal parts, the metal backing 8 and the porcelain facing 1.

The details of the metal backing 8. are as follows:

The body of the meital backing 8 has aseat upon its'upper face and a pin projecting upwardly from the center of time seat, as is usual in mounting the artlficlal Specification of Letters Patent. Application filed September 2,1914. seas-m. 359,922."

tooth against a natural root.

- and there being the lower ends of the ribs 9, and there being Patented Feb-if a face of thebody of the'metal backing forms a 'seat 11 for the porcelain facing 1, said seat being concaved or curved, when seen in side elevation or vertical cross-section as in Figs. 4 and 5, and said seat being concaved or curved in horizontal cross section, as seen in Figs. 6, 7, 8 and 9; In Vertical cross-section the backing extends from the extreme upper end of the facing to the extreme lower end thereof and the surface of the seat is offset forwardly to form the stop 13 about one- The front a quarter of the way down from the top, and interlocking' ribs -9 extend forwardly and downwardly from the top of the seat II to about three-quarters of the way down thus forming a dovetail groove. The blade portion 10,.b'elow the lower ends of the ribs 9 is comparatively thinand is tapered to a lip edge 12 which forms a backing and support for the extreme lower edge 'of the facing.

The details of the'porcelain facing 1 are as follows:-

The inner face 7 of the body ofporcelain is convex to fit closely the seat 11, there beterlocking ribs 9 and form a dove-tail tongue and groove connection between the facing and backing, and there being a shoulder 5 below the upper edge 6 to fit the stop 13, extensions 4 fitting against a cutting edge 3"fitting the lip 12;

The metal of the backing 8 forms a'thin sharp edged'rim all the way around the seat 11 and the convex face 7 fits within this rim, and the seat 11 is deep enough to receive substantially one-half of the thickness of the orcelain as shown in Figs. 6, 7 and 8, so that the porcelain is well embraced in all directions.

Cement is applied to the joint faces and then the porcelain is pressed upwardly to make the tongue and groove connection, and then the porcelain is pressed firmly into the seat, and after the cement has hardened the exposed surfaces are burnished.

' I claim:

An artificial tooth comprising a metal backing having a seat concave horizontally and vertically, there being a horizontal stop in th upper part of the seat and there being inte ocking ribs extending downwardly from the ends of the stop and forming a dovetail groove, and the metal around the 1 ing interlocking grooves 2 to receive the inp loo said seat beingdeep enough from the edge fitting said stop and having grooves to receive said interlocking ribs and form a dovetail connection and having extensions fitting against the endsof said ribs, and substantially one-half of the thickness of said por- 1 0 celain being in said seat beyond the edge of said rim, so that the rim embraces the body of the porcelain all'the Way around.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 28th day of August, 1914.

*OTTO G. HESS.

In. presence of- James 11. TOWNSEND, L. BELLF \VnAvnn.