US1026213A - Artificial tooth and crown. - Google Patents

Description

J. KOHN.

ARTIFICIAL TOOTH AND GROWN.

APPLICATION FILED AUG. 16, 1910.

1,026,21 3. v Patented May 14,1912.

awe/Mom JOSEPH KOHN, OF PHILADELPHIA, PENNSYLVANIA.

ARTIFICIAL TOOTH AND CROWN.

Specification of Letters Patent.

Patented May 14, 1912.

Application filed August 16, 1910. Serial No. 577,457.

To all whom it may concern Be it known that I, JOSEPH KoHN, a citizen of the United States, residing in Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Artificial Teeth and Crowns; and I do hereby 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.

My invention relates to improvements in artificial teeth and crowns, being more especially the process of making and securing the pivot to the tooth or crown.

In order to enable the dentist to secure an artificial tooth to a plate or to attach a crown to a root, the tooth or crown is generally provided with pins or rivets fastened in the body of the tooth or crown. In common practice,these pins or rivets are made either of platinum, in which case they are baked into the tooth or crown, or they are made of a cheaper metal soldered to a platinum anchorage which has been previously baked into the tooth or crown, the latter method being employed with a view to economizing in the use of platinum, which rare metal alone will successfully withstand the heat required to bake the tooth or crown.

The object of my invention is to provide an improved form of anchorage to which a pivot or pin of suitable material may be firmly and securely attached, after the tooth or crown is baked, and more readily and with greater certainty that the solder has thoroughly united the pivot to the anchorage than is afforded by the methods now employed for this purpose; and in carrying out my said invention I employ a strip of platinum provided with a flat portion, which forms one side of a cavity or socket provided in the tooth or crown, and which cavity or socket I preferably make of a shape that will provide a flat wall, such as halfround, triangular or square. The end of the platinum strip is provided with a bend or corrugation, which is embedded in the tooth or crown, and prevents the pulling out of the strip, which is baked into the tooth or crown. In combination with this construction the pin or pivot employed is shaped at its inner end to the form of the cavity or socket, with a flat surface which abuts against the platinum strip and to which it can be readily soldered.

To more clearly illustrate my invention, attention is invited to the accompanying drawings, in which- Figure 1 is a vertical central sectional view through an artificial tooth embodying my invention. Fig. 2 is a similar view minus the pivot. Fig. 3 is a top perspective view of the tooth; and Fig. 4 is a perspective view of the pivot.

Referring to the drawings: 1 designates an artificial tooth, made of the usual material and provided with a pivot receiving cavity 2 of a half-round or D-shaped form, which I prefer to use, and which has the flat wall 3, and the curved wall 4:.

When the tooth is baked, the strip 5, of platinum, is firmly held in the body of the tooth, with its flat portion 6 resting against, and baked to, the flat side 3 of the cavity, and its bent or corrugated portion 7 embedded within the plastic body of the tooth. By this means, it will be seen that the strip cannot readily be pulled out of the teeth, even should the portion 6 become loose from the side 3. The flat portion 6 of the thin platinum strip is made to cover the entire depth of the flat side of the cavity, if the cavity is half-round, or on one side if it is square or triangular.

The pivot or pin 8 consists of the body portion of usual shape, while the tooth engaging end is provided with the flat side 9, which is of the length of the depth of the cavity or socket 2 of the tooth, the shoulder 10 of the pin or pivot resting upon the upper portion of the tooth exterior of the cavity, while the rounded portion 11 of the pivot or pin snugly fits and abuts against the correspondingly curved wall 4 of the cavity. After the tooth, with the platinum strip embedded therein, is baked, the pin or pivot is attached thereto by soldering the flat side 9 of its tooth engaging end to the flat portion 6 of the platinum strip, thus insuring the locking of the pin or pivot of the tooth, while the irregular shape of the cavity and co-acting end of the pin or pivot insures the latter against any turning movement.

By this construction, it will be readily seen that my invention has many advantages, namely: The proper union of the strip and pin is more certain, as the solder does not have to travel to the bottom of the cavity to make the union, as is the case where a tube is used for the anchorage, and the union being visible the failure of the solder to unite properly can be readily detected before the tooth is secured to the plate or the crown attached to the root; the cost is reduoed in view of the fact that less platinum is employed; and the strength and durability are increased as the whole length of the pivot'end is united to the strip, and the strip being baked with its bent or corrugated end within the body of the porcelain of the tooth will make a firm anchorage, and one less lia- 7 ing of the union.

What I claim, as new, is

1. An artificial tooth or crown comprising a body portion of plastic material provided with a cavity of half-round shape in the top thereof, a strip of refractory metal embedded within the body of the tooth and below the surface of said cavity and extending up forming a metal wall along the flat side of said cavity, and a pin of less refractory 2. An artificial tooth or crown comprising a body portion of plastic material provided with a cavity having a flat side, a strip of refractory metal anchored within the body of the tooth and having a portion fitting against the fiat wall of the cavity, and a pin or pivot of less refractory metal having an end similar in shape to the cavity adapted to fit within the cavity and be secured to said strip, and provided with a recess fitting over said strip.

3. An artificial tooth or crown, comprising a body portion made of a plastic material, said body portion being provided with a cavity having a fiat side, a strip of metal anchored and baked within the body and having a portion forming a fiat wall of the cavity and extending slightly above the mouth of the cavity, and a pin or pivot having an end similar in shape to the cavity adapted to fit within the cavity, and provided with a recess fitting over the projecting portion of the strip.

JOSEPH KOHN.

Witnesses ALEX. J. BRIAN, BELLE B. FRAME.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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