US989245A - Artificial tooth. - Google Patents

Description

H. A. GOLLOBIN & N. A. BORNSTEIN. ARTIFICIAL TOOTH.

APPLICATION nun 11.11.21, 1910.

989,245, mama Apr. 11,1911.

UNITED STATES PATENT OFFICE.

HARRY A. GOLLOBIN AND NEWTON A. BORNSTEIN, 0F NEWARK, .NEW JERSEY, ASSIGN- ORS TO THE DENTAL DENTURE IMPROVEMENT COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ARTIFICIAL 'roorH.

Specification of Letters Patent.

Patent-ed Apr. 11, 1911.

Application filed January 21, 1910. Serial No. 539,397.

T 0 all whom it may concern:

Be it known that we, HARRY A. GOLLOBIN, a subject of the Russian Empire, and New- TON A. BORNSTEIN, a citizen of the United States, and residents of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Artificial Teeth, of which the following is a specification.

()ur invention relates to improvements in artificial teeth and more particularly to the shape of the tooth crown and to the shape of the pin receiving hole, whereby a better fit may be obtained between the tooth crown and the part to which it is to be applied and in which the strength of the tooth crown is materially increased both by its shape and by the shape of the pin receiving hole.

A practical embodiment of our invention is represented in the accompanying drawings, in which Figure 1 is a plan view of one form of tooth crown, Fig. 2 is a side view of the same, Fig. 3 is a front view, Fig. 4 is a section taken in the plane of the line AA of Fig. 1, looking in the direction of the arrows, Fig. 5 is a section taken in the plane of the line B-B of Fig. at, looking in the direction of the arrows, Fig. 6 is a side view of another form of tooth crown, and Fig. 7 is a central section from front to rear through the same.

The pin receiving hole 1 of the tooth crown is tapered, in the present instance, conical, thus permitting the bottom of the hole to be brought down toward the incisal edge 2 of the tooth crown a sufficient distance to give the hole an extended pin receiving surface without danger of weakening the labial wall 3 or the lingual wall 4: of the tooth crown opposite the bottom of the hole as is the case where the hole is made of the same diameter throughout or where its bottom is enlarged, as is common.

A seat 5, G, is provided at the mouth of the pin receiving hole 1 in the base of the tooth crown and the base of the tooth crown is made concave, as shown at 7, the bottom of the cavity reaching to the mouth of the pin receiving hole 1, thus dividing the seat 5, 6, at the mouth of the said hole and furnishing an uninterrupted wall between the mouth of the hole and the side walls of the tooth crown.

It sometimes happens in bridge work that the lingual recession of the gum is more than the labial recession. In this particular case we have shown the lingual wall 1 extended farther beyond the mouth of the pin receiving hole 1 than the labial wall thus rendering the crown particularly Well adapted for those cases where the lingual recession is greater than the labial recession.

Parts shown and described but not claimed herein form subject-matter included in our co-pending applications filed of even date herewith, Serial Nos. 539,398 and 539,399.

What we claim is An artificial tooth crown having a tapered pin receiving hole therein extending from its base toward its incisal edge, and a seat at the mouth of the hole, said base being concave and the bottom of its concavity extending to the mouth of the hole, thus dividing the seat and furnishing an uninterrupted wall between the mouth of the hole and the side walls of the tooth crown.

In testimony, that we claim the foregoing as our invention, we have signed our names in presence of two witnesses, this 14th day of Jam'lary, 1910.

HARRY A. GOLLOBIN. NEWTON A. BORNSTEIN.

Witnesses:

F. Gnonee BARRY, C. S. SUNnonnN.

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

. Washington, D. G.

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