US969050A - Artificial tooth. - Google Patents

Description

J. E. EVANS.

ARTIFICIAL TOOTH.

APPLIUATION FILED N011?, 1909.

969,050. Patented Aug. 30, 1910.

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, oNrrnn sTArns 'PATENT mais@o JOHN E. EVANS,

OF LIMA, OHIO.

ARTIFICIAL TOOTH.

T 0 all whom it may concern:

Be it known that I, Jol-IN E. EvANs,a citizen of the United States, residing at Lima, in the county of Allen and State of Ohio, have invented certain new and useful Improvements in Artificial Teeth; and I do declare the following -to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to artificial teeth, such as are secured in position by a bridge.

The object of the invention is to provide an artificial tooth for use in bridge work having an improved construction of cusp or masticating surface and means whereby the latter is secured to the body yof the tooth and the teeth secured together with about onefourth to one-half as much gold as is necessary under the present system of bridgework.

IVith the foregoing and other objects in View, the invention consists of certain novel features of construction, combination and arrangement of parts, as will be more fully described and particularly pointed out in t-he appended claims.

In the accompanying drawings F igure l is a perspective view of a detached tooth constructed in accordance with my invention. Fig. 2 is a similar View showing the lining and cusp separated from and in position to be engaged with the end of the tooth. Fig. 3 is a vertical sectional View of the same. Fig. a is a rear view of the completed tooth. Fig. 5 is a perspective View taken from t-he lower end of a tooth showing the lining or backing arranged thereon before the cusp is soldered thereto. Fig. 6 is a perspective View of a modified form of the tooth showing the same provided with but one lining holding pin. Fig. 7 is a side view of another modified form of the tooth.

In this improved bridge Itooth the gold is placed exactly where the stress is exerted and not on the lingual side of the tooth, which latter attachment is undesirable as the porcelain is easily broken loose from the gold should the tooth bite on some hard substance. As shown, this tooth comprises a body portion which is preferably formed of porcelain and has `the usual buccal or cheek surface l, lingual or rear surface 2, and occlusial or masticating surface 3. The porcelain body portion of the tooth has preferably arranged therein two small vertically Specicaton of Letters Patent.

Application filed November 17, 1909.

Serial No. 528,461.

disposed pins 4, formed of platinum or other non-fusible metal, which project through the lower face of thetooth for a purpose to be described.

Secured to the lower end of the porcelain tooth is a backing 5, which is formed-of platinum or gold. The backing 5 is burnished down against the end of the tooth and is secured by the projecting ends of the platinum pins 4, which extend through said backing and are clenched against the same. Adapted to be secured to the backing 5 is a metal tip or cusp 6, which is formed to correspond to the masticating surface of the tooth to which it is to be applied and said cusp 0r tip is secured to the backing 5 by Patented Aug. so, 1910.

gold solder 7, which is owed into the V- shaped space between the cusp or tip and the backing 5 on the end of the tooth, as shown. By thus securing the tip or cusp to the end of the tooth, the cusp and the solder will appear in the finished product, as one piece of gold, and the teeth may thereby be fastened together and at the same time to the crowned teeth (not shown) which are used as abutments. A tooth constructed as herein shown and described will be strong and durable and will have the appearance of a natural tooth with a gold crown.

It will beobserved that the gold on the end of the tooth is not thicker than a dime at the buccal side and at t-he lingual side it is not thicker than a silver dollar. The gold solder 7 which fastens the tip or cusp 6 to the backing 5 also serves to fastenthe teeth together and to the crowns (not shown) ,which engage the teeth at the opposite sides of the space to be bridged and which serve as the usual abutments.

It will also be observed that this improved tooth is thicker from the buccal to the lingual surface than the teeth formerly used which provides for the teeth being soldered to the crown tooth at the point where the fastening sustains the greatest stress, to wit: at the masticating surface of the crown tooth, and all of the gold which is at the present time flowed back of the bridge tooth on the lingual side, is eliminated, whereby a great saving of gold is effected.

The first requirement of a bridge is strength and this construction provides great strength in that the attachment is made at the greatest point of resistance where the crown is heaviest.

While I have herein described the tooth as provided with two backing fastening pins 5, I may, if desired, employ but one pin for this purpose as shown at-8 in Fig. 6 of the drawings.

In Fig. 7 of the drawing is shown a slightly modified form of the tooth in which an offset or projection 8 is formed on the lower end of the tooth at the buccal or cheek surface and forms a continuation or ext-ension of said surface. The otfset or projection 8 forms a shield for the connection which secures the gold cusp to the backing on the end of the tooth, and protects the same from a blow thereby greatly increasing the strength of the tooth.

It will be noted that in the form of the tooth shown in Fig. 7, very little of the gold solder is presented to view on the outer side of the tooth.

The term cusp as used in dental phraseology is applied to the point or biting end of the tooth.

From the foregoing description, taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention, as defined in the appended claims.

Having thus described my invention, what I claim is l. An articial tooth, comprising a porcelain body portion, a pin embedded in said body portion, and depending below the lower face of the tooth, a metal backing secured to the lower end of said tooth by said pin and a gold cusp secured to said backing.

2. An artificial tooth, comprising a body portion, a pin embedded in said tooth and projecting below the lower end of the tooth, a metal backing arranged on said lower end and secured by the projecting end of said pin, a cusp secured to said backing by a gold solder connection, whereby the cusp and the solder will appear as one piece of gold on the end of the tooth.

8. An artificial tooth, comprising a body witnesses.

JOHN E. EVANS. Vitnesses:

EUGENE T. LIPPINCOTT, LEETA Huss.

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