US1099393A - Artificial tooth. - Google Patents

Description

S. H. POLLOGK.

ARTIFICIAL TOOTH.

APPLICATION FILED JULY 1a, 1913.

Patnted June 9, 191i Inventor:

Attorneys UNITED STATES PATENT OFFICE.

SAMUEL H. POLLOCK, OF ROCKY FORD, COLORADO.

ARTIFICIAL TOOTH.

Specification of Letters Patent.

Patented June 9, 19214.

Application filed July 18, 1913. Serial No. 779,807.

larly to what has become known inthe art as a porcelain crown.

It is the object of the present invention to provide novel and improved means for anchoring the crown to the root or stub of a tooth.

Another object of the present invention is to provide a crown adapted to be anchored to a root, and so constructed, that a bridge may be readily soldered or attached thereto for supporting another tooth or a plurality of teeth.

A further object of the present invention is to provide a device of the nature indicated which will provide a comparatively strong and eflicient tooth, the construction being relatively simple and inexpensive, and the crown being readily applicable to different roots.

WVith the foregoing general objects outlined and with other objects in view, which will be apparent as the nature of the invention is better understood, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention has been illustrated in its preferred embodiment in the accompanying drawing, wherein Figure l is a side elevation of the improved crown. Fig. 2 is a front view of the crown. Fig. 3 is a rear or lingual view of the crown. Fig. i is a sectional view of the crown as applied to a root. Fig. 5 is a perspective view of the body portion of the crown. Fig. 6 is a perspective View of the backing of the crown. Fig. 7 is a perspective view of the crown pin.

In carrying out the present invention, there is provided a body portion or crown proper 1 of porcelain or other refractory material, and which is commonly termed a porcelain crown. The basal portion of the crown 1 is relatively large, or is of a contour. approximately the same as that of the base of the root, while the free or outer portion of the crown has a cutting edge similar to an anterior tooth. The back or lingual side of the crown 1 is preferably concavcd between the extremities of the crown, and the basal portion of the facing.

is preferably countersunk as at 3. The crown 1 is provided with a diagonal bore 4 extending from its lingual side to the base, so that the bore may be said to extend diagonally from the lingual side to the base. The bore 4 is preferably of circular cross section, and terminates centrally of the counter sunk portion 3. The bore a is also preferably, although not necessarily, curved slightly.

In connection with the crown 1, there is employed a backing 5, of gold or any other suitable metal or material. The backing 5 is con'iparatively thin and is shaped to conform to the lingual side of the crown, the edges or marginal portions of the backing being flanged or worked over the edges of the lingual side of the crown. Attached at an acute angle to the backing 5 is a tubular or socket member 6, of any suitable metal, preferably such as is inexpensive and. 11on-corrosive, and preferably having internal grooves or notches. The tube or socket 6 is adapted to slip upwardly within the bore 4 of the crown, in order that the free end of the tube or socket will become flush with the counter sunk portion 3. The tube or socket G is also preferably curved slightly to conform to the curvature of the bore 4.

The numeral 7 designates the pin which is adapted to be inserted into the root canal or cavity, the pin being preferably flat and tapered, and having the transverse depressions 8 in its sldes. The pm 7 is provided with the head or flange 9 at its butt end,

and is further provided with a short shank 1O projecting from the head 9. The shank 10 is preferably circular in cross section and of a diameter slightly smaller than the internal cross section of the tube or socket 6. The shank 10 is provided with a plurality of annular or circumferential grooves 11 forming collars or shoulders 12. The shank 10 is also curved slightly to conform to the curvatures of the tube 6 and bore 4. The pin 7 may be constructed of any suitable metal adapted for the purposes for which it is employed.

A tooth root 13 has been illustrated in Fig. 4c, the same having the ordinary canal or cavity 14, which is designed Or adapted to receive the pin 7 The present crown is applied to the root as follows :-After the natural tooth has been properly broken away to expose the root canal or cavity, and after the said canal or cavity has been properly treated, the pin 7 is secured within the canal 14 by means of suitable cement 15. The pin may be readily cemented within the root canal, the cement working into the depressions or grooves 8 of the pin to securely lock or anchor the pin within the root,'with the head 9 and shank 10 of the pin exposed. V The shank 10., when the same is curved, is set'so as to project rearwardly, as seen in Fig. 4. It is to be understood, of course, that the pin is properly positioned before the cement sets or hardens. Then, after the tube or socket 6 of the backing has been inserted into the bore of the crown, the said facing and backing may be applied to the shank of the pin to test the crown. If the crown is untrue with respect to the root, the same may be readily ground. to shape in a manner which will be apparent to those versed. in the art. It is to be observed that the crown embodying the backing may be readily slipped onto and off of the shank of the pin without creating any undue strain upon the root. After the crown has been properly ground or shaped, the same, together with the backing, is secured in place. This is accomplished by placing any suitable cement 16 bet-ween the crown and the root when the crown is applied, the cement running or flowing into the tube 6 also. Then as the crown is slid or forced home, the tube in receiving the shank of the pin, will cause the cement within the tube to enter the grooves 11 of the shank, and will cause that portion of the cement between the crown and root to conform to the irregularities of the adjoining portions of the crown and root. The superfluous cement is then wiped away, and after the cement has hardened or set, the crown will be rigidly anchored to theroot. The tooth thus provided will be very rigid and durable, it being noted that thecrown is not only cemented to the root, but is held by the backing which has the tube passing through the crown and secured over the shank of the pin. The present tooth is adapted to resist the strains to which it is subjected, such as the strain of mastication, in an efi'ective manner. It desired, the backing may be extended over the incisive edge of the crown, so that the backing will directly receive the strains of mastication.

The present tooth or crown, is particularly useful in connection with bridgework, the present crown being adapted to replace an anterior tooth, by breaking the anterior tooth away, so that the. present crown may be applied as above indicated. When the present crown is applied, it will be observed that the backing may serve as an abutment .for the attachment of a bridge or other support for the other tooth or teeth.

The present crown or tooth, may even be removed from the pln after the crown has been cemented in position. This may be accomplished by prying or otherwise loosening the crown from the tooth, the crown being twisted or otherwise loosened from the shank of the anchor pin. Attention is directed to the fact that the anchor pin is perthe backing and crown being detachable to permit the application of the solder to the backing without heating the crown. The present crown may be employed with or without a cap or band to embrace the juncture between the crown and the root.

Having thus described the invention, what is claimed as new is 1. In an artificial tooth, a crown having a bore therethrough, a root-engaging anchor pin, and a crown backing, the anchor pin and backing having members adapted to be received by the said bore and to be secured together therein.

2. In an artificial tooth, a root-engaging anchor pin, and a crown backing, a crown having a bore therethrough, one of the two first mentioned parts having a socket insertible into the said bore, and the other of the two first mentioned parts having a portion insertible into the said socket.

3. In an artificial tooth, a crown having a diagonal bore therethrough, a backing having an integral tube arranged at an acute angle relative thereto and insertible into the said bore, and a root-engaging anchor pin having a shank insertibleinto the said tube to be secured therein. I 1

In testimony thatv I claimthe foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

A..G. SLOAN, C. W. FnNLAsoN.

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

Washington, D. U.

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