US2043999A

US2043999A - Dental matrix holder

Info

Publication number: US2043999A
Application number: US750107A
Authority: US
Inventors: William E Harper
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-10-26
Filing date: 1934-10-26
Publication date: 1936-06-16
Anticipated expiration: 1953-06-16

Description

June 16, 1936. w HARPER DENTAL MATRIX HOLDER Filed Oct. 26, 1954 0 4, 1 MM rm m/ m w I Z Patented June 16, 1936 UNITED STATES PATENT OFFICE 9 Claims.

This invention relatesto new and useful improvements in dental matrix holders.

Specifically this invention is directed to improvements over the inventions disclosed and claimed in my Patent No. 1,908,145 granted May 9-, 1933, directed to Dental matrix holder jaw.

The results obtained by-using the improved jaw therein described while far superior to the results obtained before were lacking to some extent for under certain circumstances of peculiar cavity formation the matrix band did not completely conform to the anatomical form of the tooth and the resultant rough or overhanging edge of the filling necessitated tedious grinding and polishing.

My present invention is provided to overcome this difficulty and to present a completely improved matrix holder for dental work.

The principal object of the invention is to provide a supplemental wedge member associated with the flexible jaws adapted to be used optionally.

Another object is to provide a new means for securing the jaws to the arms of the holder so as to obtain the maximum leverage at the desired point.

Another object is to provide a novel clamping bar for the arms of the holder which is reversible so as to position the screw head at either side of the holder and. formed so as to permit the holder to be positioned at the lowest possible angle when inoperation. 1

Still another object is to provide the arms of the holder with slots to permit easy removal by means of rubber dam forceps.

Numerous other objects and advantages will be apparent from the followingdetailed description.

In the accompanying drawing:

Fig. 1 is a plan view of my improved dental matrix holder.

Fig. 2 is a side elevation of the structure of Fig. 1.

Fig. 3 is a sectional View taken along line 3-3 of Fig. 1.

Fig. 4 is a sectional view taken along line 4-4 of Fig. 2.

Fig. 5 is a sectional view taken along line 55 of Fig. 2.

Fig. 6 is a perspective view of the supplemental wedge member.

Fig. 7 is a perspective view of one of the jaws.

Fig. 8 is a perspective view of one of the jaw and wedge member holders.

Referring more particularly to the drawing wherein like and corresponding parts are designated by similar reference characters throughout, I indicates the arms. of the holder pivotally joined together by pin. 2 and held in closed position by spring 3 secured to each arm near the pivot point. Notches' I a are provided on the inside edges of the arms I for the purpose hereinafter described. The clamping bar 4. is interiorly threaded at one end. 5 to receive the. screw 6 having a knurled. head I. The is longitudinally slotted'as at 8 soas to receive the arms I of the holder and a portion. of one side of the bar is cut away as at 9 to permit the removal and reversal of the bar as desired.

The: outer ends of the arms. l are looped as at It to form substantially circular apertures ll.

Through these apertures are positioned the threaded shanks I2 of the jaw and wedge member holders [3 which shanks extend at right angles to and from the ends of the holders proper which are secured in this. position by means of spring washers l4 and knurled nuts ['5 as clearly shown in Fig. 4.. The holders I 3 are provided with slots Hi and circular apertures H which extend through the shanks I2. The flexible jaws l8 are provided in their backs with circular apertures I9 positioned below the centers for the reason hereinafter explained. The wedge member 20: comprises'a tubular shank 2f slotted as at 22 and a wedge shaped end 23. The slot 22 permits the wedge to be sprung apart slightly so as to present a yieldable frictional fit as hereinafter described.

In the assembly the back of a jaw i8 is positioned within the slot [6' of the holder l3 with the aperture [9 aligned with the aperture ll of the holder. The wedge member 20 is then forced through these apertures until the wedge shaped end 23' is within the jaw I8 and the other end extends from the other side of the holder as at 24, Fig. 5. As explained the wedge is yieldably held in this position due to the slot 22. This wedge member 20 holds the jaw I8 in position so that in operation the force moving the jaws together will be directed against the lower portion of the jaws. The holder I3 with this assembly is then secured to one of the arms I as hereinbefore described.

In operation the matrix band is positioned between two teeth adjacent the approximal cavity, the jaws of the matrix holder are then also positioned between the teeth with the band between them and the cavity and the spring 3 holds this initial position. The clamping bar 4 having been placed on the arms I with the head 1 to the desired side so as not to interfere and the cut away portion 9 down so as to permit the lowest positioning of the holder, the screw 6 is then tightened so as to cause the arms to move toward each other. This action causes the jaws to approach one another, the flexible arms thereof forming the matrix band to the tooth having the cavity. If upon examination it is then determined that a further forming of the band is necessary to insure perfecting the anatomical shape of the tooth, the extending shanks 2| of the wedge members 20 as shown at 24 are then pressed toward the opposing one, thus forcing the wedges between the jaws to spread them thus forcing the lower part of the matrix against the tooth to supplement the action of the flexible jaws in forming the matrix band.

To effect removal of the holder after filling the tooth the screw 6 of the clamping bar is loosened to permit the bar to be moved toward the point of pivot or to be removed and the arms are forced apart by rubber dam forceps the ends of which are positioned within the notches la.

It can readily be seen that by use of the bar clamp herein described the knurled head of the screw can be positioned at one side or the other so that it will be out of the way at all times.

I claim:

1. A dental matrix holder comprising a pair of arms pivotally joined together to present a pair of free ends, resilient jaws secured to the free ends of the arms, and a supplemental wedge member movably positioned within each of said jaws.

2. A dental matrix holder comprising a pair of arms pivotally joined together to present a pair of free ends, resilient jaws secured to the free ends of the arms, and a supplemental wedge member movably positioned within each of said jaws adapted to be independently moved inwardly from said arms comprising a cylindrical shank extending through said jaw members.

3. A dental matrix holder comprising a pair of arms pivotally joined together to present a pair of free ends, holding members secured to the free ends of the arms, jaw members secured to the holding members and supplemental wedge members movably positioned within said jaw members comprising wedge portions and cylindrical shanks extending through said holding members.

4. A dental matrix holder comprising a pair of arms pivotally joined together to present a pair of free ends, loops formed by the free ends of said arms, holding members secured to said ends through said loops, wedge shaped resilient jaw members secured to said holding members, and supplemental wedge members each comprising a wedge shaped head and a cylindrical shank, the wedge shaped head portion positioned within a. jaw member with the shank portion extending through said jaw member and holding member.

5. A dental matrix holder comprising a pair of arms pivotally joined together to present a pair of free ends, loops formed by the free ends of said arms, holding members provided with vertically extending slots secured to said ends through said loops, resilient jaw members each comprising a back portion, a, pair of shoulders, a pair of walls converging from said shoulders, the back portions fitting within the slots of the holding members and a supplemental wedge member movably positioned within each jaw member between said converging walls and extending through the back of said jaw and said holding member.

6. A dental matrix holder comprising a pair of arms pivotally joined together to present a pair of free ends, loops formed by the free ends of said arms, holding members provided with vertically extending slots secured to said ends through said loops, jaw members each comprising a vertically extending back portion, a pair of shoulders, a pair of walls converging from said shoulders, the back portions fitting within the slots of the holding members to position said jaw member, a slotted supplemental wedge member movably positioned within each jaw member between said converging walls and extending through the back of said jaw and said holding member to present an end portion adapted to be pressed to move said supplemental wedge member between the walls of said jaw.

'7. A dental matrix holder comprising a. pair of arms pivotally joined together at one pair of ends to present a pair of free ends, holding means each comprising a vertically slotted head and a hollow shank secured to the free ends of said arms, jaw members each comprising a back portion formed with an aperture adjacent the lower part of the jaw, a pair of shoulders, a pair of walls converging from said shoulders, said back portions fitting within the slots of the holding members, the apertures aligned with the hollow portions of the shanks and supplemental wedge members movably positioned within each jaw member between said converging walls and extending through the said apertures and hollow shanks and yieldably held there so as to be optionally moved inwardly to supplement the action of the said jaw members.

8. A dental matrix holder comprising a pair of arms pivotally joined together at one pair of ends, the other ends being free, notches on the inner edges of said arms to facilitate removal, spring jaws on said free ends and supplemental wedge members movably mounted within said spring aws.

9. A dental matrix holder comprising a pair of arms pivotally joined together at one pair of ends, the other ends being free, spring jaws mounted on said free ends and supplemental wedge members movably mounted within said spring jaws below the horizontal centers thereof.

WILLIAM E. HARPER.