USRE9985E - Territory - Google Patents

Description

HJMAO Qssignor to W. J. P E YT'oN. ARTIFICIAL TOOTH.

"No 9,985. Reissued De .2o,1'a81.

WITNESSES j INVEJV'TOR Charles .H, Mam? a his Afte a I a a y i UNITED STATES PATENT OrFicE.

CHARLES n. MACK, or WALLA WALLA, WASHINGTON 'rnnntrotm'asstenon' ro WILLIAMJ. m rror, or WASHINGTON, ntsrntc'ror COLUMBIA.

ARTIFICIAL TOOTH.

srncrrrcarrron forming part of .Reissued Letters Patent No. 9,985, dated December 20,1881,

Original No. 123,271, dated January 30, 1872. Application for reissue filed May 2, v

rented certain'new and useful Improvements in Artificial Teeth; and I do hereby declare that the followingis a full, clear, and exact description thereof, reference being bad to the accompanying drawings and the letters of reference marked thereon, which form a part of this specification. I

The object of this invention is to permanently secure artificial tooth-crowns to natural tooth-roots while in the mouth in amannerthat permits of easy manipulation and better results than have heretofore been possible; and my said invention consists, first, in an artificial tooth-crown having an undercut,'shonldered, or dovetailed vertical opening, said opening, at the base of the crown, extending from near the lingual to near the labial or buccal surface thereof; secondly, in the combination 'of an artificial tooth-crown having an un- I dcrent or shouldered vertical opening with a natural tooth-root bymeans of, first, twore-, taining-pins projecting from the root, and, second, a material contained in said crown-opening in which said retaining-pins. are embedded, said material being put into a soft state to permit the crown to be fitted to the root over the retaining-pins, and then allowed to harden to firmly embed saidpins.

In the drawings, Figure 1 is a vertical sec tion of an artificial molar-tooth crown, showing clearlythe vertical' undercut opening or dovetail mortise. 'Fig. 2 "is a bottom view of said crown. Figs. 3 and '4 are views in elevation of a natural root prepared for the reception of the crown. Figs. 5. and 6 are vertical sections at right angles to'each other through an artificialincisor-tooth crown.

The artificial crown A has avertical undercnt or dovetailed opening or'1nortise,a, to receive and retain a mass of retaining material, and-also the upper ends ofpins b b, secured in and projecting from the natural root B.

The said opening not only extends vertically upward a sutlicient distance from the base of i the crown to enable the crown to be firmly an-.

' threads. The pins are then firmly seeur'ed in the holes. The opening in the crown is now tach ment to natural tooth-root's have been prochoredupon the pins, but'it is-also'ofi such a shape as to extend from. hear'tbe lingual surface of the crown to near thel'abial or buccal surface, thereby beingof such dimensions as to be capable of receiving a mass of retaining material in which the pinswhich project from I the root are embedded when the'crown'is fitted to the root. The crownisthns given the capacity of receiving a sntiieient mass of retaining material to firmly secureitnpon the root, and italso has suflieientlatitude of move-' ment to be accuratelyfitted or adjusted upon the root so as to have an artistic finish. In applying .my improved crow-n I first prepare the root, filling the nerve-cavity with gold or other appropriate filling. .Ithemat the anterior and posterior sides of the filling, drill a hole in the solid denti'ne' .for the admission of the pins 11 1), upon which are cut 'small'screwfilled with a fusible metal, one that'will fuse at a low degree of temperature-such as the compound known as \Voods fusible metal and while yet soft I press the crown firmly over the pins b b, so thatthe said pins will be embedded in the soft metal; As soon as the metal hardens it will be obvious that the crown will be firmly fastened to'the root.

It will be particularly observed that the top of the root is slightly excavated, and that the I crowns at the bottom are rounded or shaped so as to fit snugly therein.

The crown and root, when joinedtogether as described, will form astrongand durable tooth. Additional durability and strength result from I the curving of the crown to,fit a. corresponding seat in the root.

' I am awarethatartificial tooth-crownst'or at- 9O vided with a small round central hole to receive a retaining screw or pin projecting from the root; but they have not been found to meet the requirements of the art as to ease'of applicati on, durability, and strength. The small 'round hole will not retain the securing material as well as lnyenlarged undercut or shoulder'ed opening, while securin g the crown at the center only does not give the requisite strength and durability. The crown, I have found by well up in-the crown, so as to contain a mass of.

I experience, needs to be secured to the root not only at the center, but toward the anterior and posterior thereof, and this I accomplish by making-the opening so large as to extend toward the labial and lingual surfaces as well as the retaining material in which the retainingpins may be embedded. v

I am also aware that artificial teeth and gums have been constructed with dovetail, shouldered, or retaining slots, and that'the' gums of artificial teeth having such slots were I also provided with pins in saidslots to aid in fastening the teeth and gumsto the plate; but none of them involve myinvention so far as I understand them. My objeet is to" use the" natural fang or root in connection with anartificlal crown, and so secure the two together that the new tooth is as good and as strong as if grown wholly in the mouth, and this without the pain of extracting the root.

I am also aware thata recess has been formed on the outer surface of a crown; but this also differs radically from my invention, as itdoes' not suggest'a crown having the ca.-

pabilities of mine, nor particularly a crown capable oi'receiving a mass of retaining met I near the lingual to terial within it, extending at the base from I v near the labial or bucca'l "mass surfaces, in order to secure the crown firmly to. the root.

\Having. thus described. my invention, I claim i v 1. An artificial tooth-crown for application to natural tooth-roots .while in the month, eonstrucled, substantiail y as hereinbefore setforth, with a vertical undercut, shouldered, or dove labial or buccal surface thereof. 2. The combination, substantially as hereinbcfore set-forth, of an artificial tooth-crown having a vertical undercut or shouldered opening'with a natural to retaining-pins projecting from the root and a. material which fills the crown-opening and embeds'said pins therein,'said material being put into a soft-state to permit the crown to be fitted tothe root over the retaining-pins. and then allowed to harden to securely fasten the crown and root together,

the crown from near the lingual to near the my name in the presence of two witnesses.

Witnesses:

T. J. ANDERS, h LEWIS B. None.

tailed opening, which extends at the base of oth'root by means of two In-testiinony'whereof I hereunto subscribe CHARLES H. MACK. I

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