US608984A - Half to otis m - Google Patents

Description

4 Patented Aug. 9, N898.

w. E. HANsoN. DENTAL PLUGGEB.

(Appnmion med omk 2s', 1897.1

(No Iodelj WINFIELD F. HANSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF OFF- HALF TO OTIS M. SHAW, OF SAME PLAOF.

DENTAL PLUeeERf SPECIFICATION forming part of Letters Patent No. 608,984, dated August 9, 1898.

.Application led October 28, 1897. Serial No. 656,620. (No model.)

T0 a/ZZ w27/0m it may concern:

Be it known that I, WINFIELD E. HANSON, of Boston, in the county of Suffolk and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Dental Implements. of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figurel is a side elevationof my improved dental implement with the arms opened or in their normal position; Fig. 2, 'a like View with the arms closed; Fig. 3, a vertical transverse section taken on the dotted line 3 3 in Fig.

yl; Fig. 4, a side elevation showing a modification of my improvement, and Fig. 5 a detail showing the method of mounting the carrier on its arm. I

Like letters of reference indicate corresponding parts in the different figures of the drawings. ,l

My invention relates .more especially to a dental implement designed for use in filling teeth with amalgam or soft lling,7 much difficulty having heretofore been experienced in properly and expeditiously performing work of this character on` account of the nature of the filling materials employed and a lack of suitable implementsfor that purpose.

My improvement overcomes these diiiiculties to a great extent by providing a device whereby the amalgam or filling material may be readily manipulated in either large or small quantities, forced into the cavity of the tooth, and also burnished or polished and finished when the cavity is filled.

The nature and operation of my improvement Willbe readily understood by those conversant with Such matters from the following explanation In the drawings, A B, respectively, represent two arms, which are arranged Substantially in parallelism with each other and secured at corresponding ends to a block O after the manner ofordinary tweezers or spring-pincers; but the block may be omitted and the arms connected directly to each other, if preferred.

Passing loosely through a hole or slot in the arm B there is a screw r, which is fitted to Work in a screw-threaded hole in the arm A and serves as a stop or gage to regulate the distance the arms may be opened or separated; but any other device suitable for the same purpose may be employed, if desired.

The outer or free ends of the arms A Bare correspondingly bent at a slight angle to the bodies of the arms, as respectively shown at tg, and rigidly secured to the part t of the arm A there is a plugger el, provided .at its outer end with a burnisher f, the body ofsaid plu gger standing at right angles tothe part t, but being inclined at an obtuse angle to the body'ofits arm A. The part g of the arm B is slotted longitudinally to form a fork or Way, (see Fig.` 5,-) in which a carrier 72, for containing the filling material is disposed, saidI carrier being in the form of a hollow cylinder or a tube open at both of its ends. The plugger cl is tted and arranged to work longitudinally therein somewhat after the manner of a piston.

Grooves m are formed in the sides of the carrier 7L near its inner end, in which the tines or prongs 7.o of the fork on the arm B are insei-ted.

The slot between the tines 7c is of such length as to permit the carrier to slide back and forth therein longitudinally of the part t, and the grooves m are of such size as to permit said carrier to Swing or vibrate sufhcientl y to compensate for the movements of the plugger as said plugger passes through the arc of the circle which it describes in opening and closing the arms A B.

The outer end of the carrier 7L is reduced or rabbeted exteriorly to form the shoulder i,

and also to enable the carrier to beinserted more readily in thel cavity of the tooth and canted or inclined therein, the shoulder bearing againstthe end of the toothand serving as a rest or fulcrum for the carrier, thereby enablingthe implement to be manipulated to better advantage in filling the cavity.

The plugger d is longer than Mthe carrier 71, and provided near the burnisher-head'fwith an annular groove oto permit-the -plugger to be canted or inclined more readily when fully pushed through the carrier and used strictly as a plugger or burnisher.

In the'use of my improvement after, the

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operator has excavated and properly dried and prepared the cavity in the tooth, the arms A B being in the position shown in Fig. l, the carrier 7L is pushed into the mass of plastic amalgam or iilling material, thereby forcing a quantity of the same through the mouth x into the carrier under the plugger d.

The operator now inserts the implement in the mouth of the patient, placing the outer end of the carrier in the cavity of the tooth, with the shouldert' resting on the end thereof. The arms A B are then compressed or closed, thereby causing the plugger d to force the amalgam or filling from the carrier and cause it to be ejected into the cavity, the operation being repeated until the cavity is iilled, after which the filling may be nished with the burnisher-headf without removing the implement from the mouth of the patient.

By the use of my improved implement as described the danger of either the cavity or filling becoming unduly moistened with saliva during the operation is reduced to a minimum, as the work may be accomplished with much greater rapidity and more effectively than when the iilling is inserted in the ordinary way.

`In the construction shown in Fig. l the arm B is reduced near its shank to form the spring integral with said arm; but both of the arms A B may be thus reduced, as in Fig. 4, if desired, although I deem it preferable to have the carrier-arm only so reduced. The arms may also be pivotally connected and an independent spring employed to open or separate them, or the spring may be entirely omitted when the arms are so pivoted without departing from the spirit of my invention.

The plugger CZ and carrier h are respectively inclined at an obtuse angle to the bodies of the arms A B to enable the implement to be used with greater ease and facility in filling cavities in the teeth, more especially in the molars or rear teeth; but the plugger and carriermay be arranged at any other suitable angle to the bodies of the arms A B, if

' desired or found to be necessary, in order to perform special work.

I do not coniine myself to the employment of a carrier h for the amalgam or filling which is round in cross-section, as it may be made square, octagonal, or of any other suitable form, the plugger of course being made to correspond, if necessary; nor to the use of the fork as a way for said carrier, as the carrier may be mounted in any suitable way adapted to permit it to traverse longitudinally of its arm, as described; nor to rigidly securing the plugger CZ on its arm, as the plugger may be arranged to traverse and the carrier rigidly secured, although itis preferable to have the carrier traverse and the plugger rigidly secured to its arm, as the plugger is then better adapted to serve as a burnisher. As the plugger passes through a very short arc of a circle, it will be obvious that the reciprocating movements of the carrier'are but slight, even when the plugger is fitted to work closely therein, and that when the plugger is of such size as to work loosely in the carrier the means for producing vibratory movements of the carrier may be dispensed with. I deem it, however, preferable to have the plugger work closely in the carrier in order to eject the filling material properly, especially when small quantities are used at a time. Neither do I confine myself to providing the arms with the inclined portions tg, as the plugger and carrier may be arranged and secured at an angle to their respective arms without the use of said portions. Means may also be readily provided for adjusting both the plugger and carrier at any angle on their respective arms and have them perform their functions properly.

Having thus described my invention, what I claim isl. A dental tool comprising two arms movable in relation to each other; a way formed on the free end of one of said arms; a hollow carrier mounted to move on said way, and a plugger on the companion arm fitted to work in said carrier.

2. A dental tool comprising two spring-separated arms; a carrier on one of said arms; and a plugger on the companion arm, said plugger being grooved adjacent its free end to forma head, and fitted to work in said car- 3. In a dental tool the combination of two spring-separated arms; a carrier for the lilling; a way on the free end of one of said arms on which said carrier is fitted to traverse and vibrate; a plugger rigid on the companion arm, and fitted to work in said carrier, said plugger having a head adapted to be projected beyond the mouth of the carrier when said arms are compressed, and a stop limiting the spring-actuated movement of said arms substantially as described.

4t. In a dental tool the spring-separated arms, A, B, provided respectively with the offset portions, t, g, at their free ends in combination with a hollow carrier fitted to move laterally onthe offset portion of one arm, and a plugger mounted on the offset portion of the companion arm and fitted to work in said carrier substantially as described.

5. In a dental tool the springtensioned arms, A, B, provided respectively with the offset portions, t, g, the portion, g, being slotted to form a Way, in combination with the cylindrical carrier, h, mounted to slide in the arms of said Way; the plugger, CZ, rigidly mounted on the offset, t, and fitted to Work in and project from said carrier; and the adjustable stop, fr, limiting the movement of said arms in one direction all being arranged to operate substantially as specified.

WINFIELD E. HANSON.

Witnesses:

C. A. SHAW, A. J. ORAMER.

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