US959358A - Replaceable tooth. - Google Patents

Description

F. LA-GHAPE LLB. REPLAGEABLE TOOTH. 'APPLIOATION FILED JAR-21, 1908.

Patented m 24, 1910;

fl' 5 I v 7 7 W WITNESSES: I 'INVBNTJOR amz's da velig YATTOR the construction and combination of ports baked a locking member or projecting bolt senses.

To all whom it mag concern:

Be it known that l, FRANCIS LA Ctrartsmn, a citizen of the United States, residing in the city and county of San Francisco State of California, have invented new and, useful lmnrovements in Replaceable Teeth, of which too following is a. specification.

This invention relates to dentistry, and pertains especially to artificial teeth and bridge Work.

The object of the present invention is to provide an interchangeable and replaceable artificial tooth, which will have the characteristics of being replaceable on a bridge without the necessity of taking oil the bridge; which. will be made strong end durabio and thereby lessen to a minimum the likelihood of the tooth breaking or the necessity of its over having to he .repiacedgthot it will be so supported that no lateral or other motion of the tooth on the bridge will be possible; that a considerable savio of solder and gold will be efi ected in the brld e construction, and that altogether itwill a d strength to the bridge, be artistic. in appearance, sanitary, strong, and simple and easy to manipulate.

"The invention consists of the parts and as. hereinafter more fully described and. claimed, having reference to the accompanylug-drawings, in which Figure 1 is a perspective view of a. porcelain tooth with its stud. Fig. 2 represents views of the opposite sides of the backing plate. Figs. and. 4 are side views partially broken away, of a tooth with its backing plate in place. Fig. 5 is a front view of a plurality of teeth showing one tooth removed.

A represents a porcelain tooth having a fiat back, and into which tooth has been or stud 2. Any suit-able number of interlocking belts or projections may be used, but I prefer to use a single one placed centrally in the tooth and securely anchored therein to give a solid and firm construction. This bolt has an oblong shank with the three-flanged head 3.

i is a backing-plate which is secured to the bridge by solder or otherwise. This. backing-plete has a slot 5 to receive the projection 2 on the tooth the slot being made sufficiently Wide atthe top to admitthe bolt egaeemmfion of lemons eetent. Application first. January 31, Eterie'i tt'o. err

to embrace the shank of the bolt behind'the head 3, and prevent the outward withdrawal of the tooth when the bolt hes been inserted into the slot and slipped down into piece. The length thickness of the olate, so that the parts will have asnng sliding fit; so thst Wlienthe tooth is finally secured or cemented to the hocking-plate, they will precticolly' consti tote one unitary rigid stroctln'ea I 1 of the shank corresponds to the The back of the hacking-plate has 2 cupshaped projection 6 forming a housing ing the solder from contact with the bolt or u ever the slot 5, both for the purpose of circled tooth, and constituting a pocket or chemher for the cement in which the inserted bolt is embedded and by which the "tooth is finally and permanently secured. in place. This cup or housing member 6 is secured to the backing-piste by any suitshle means; either by sweating, or solder, or otherwise.-

By halting the locking member 2 into the porcelain tooth the latter is not weakened in any Way, is as strong as a facing of this sort be made.

and having it n=-rrowed downward extension The facing and backing being joined by cement term a solid, rigid structure to resist strains and tensions, and the strength of practically the strength of the its center allows for a long overlap; and the bolt shank being square will not allow a, lateral or other motion to the tooth.

The, projecting cup or housing 6 on the hack oi. the backing-plate results in a considerable saving of solder, as there is no need for solder over the box itself. Also, the box-shaped cup is a benefit to facing with solid cusps, as it helps to build out the solder with a saving to the bridge maker.

/Vhile there is little liability of a tooth of this character breaking off aiter, being once put on to the bridge, at the same-time, this structure permits a tootl if broken, to be readily replaced, Without taking out the bridge. I

By making the interlocking proiections 2 and the hocking-plates with their corresponding elongo. slots of uniform and standard size, it permits interchangeabilityfor all parts in contact Having thus described my invention, what I claim and desire to secure by Letters Pat.- ent is- The combination with a veneer having a headed lug projecting from its rear face, of a backing comprising two plates, one being arranged parallel to the rear face of said Veneer and having a key-skit to receive said. lug, the other plate being imper'forate and furnished with a depression coverim the slot and lug and secured around its e ge is the slotted plate, whereby a closed recess is formed containing the head of fhe lug and I adapted to be filled with. cement for retain- 10 ing said head.

In testimony: whereof I have hereunto setmy hand in presence of two subscribing Witnesses.

FRANCIS LA CHAPELLE.

\Vitnesses LEONARD DARMs, lWAR'rxN ARONSOHN.

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