US427338A

US427338A - Dental matrix

Info

Publication number: US427338A
Authority: US
Publication date: 1890-05-06
Anticipated expiration: 1907-05-06

Description

(No Made l.)

W. H. MARSHALL.

. DENTAL MATRIX.

No. 427,338. Patented May 6, 1890.

EATENT FFICEG IVILLIAM H. MARSHALL, OF OXFORD, MISSISSIPPI.

DENTAL MATRIX.

SPECIFICATION forming part of Letters Patent No. 427,338, dated May 6 1890.

' Application filed February 26, 1890. Serial No. 341,820. (No model.)

To all whmn it may concern: I

Be it known that 1, WILLIAM H. IVIARSHALL, a citizen of the United States, residing at Oxford, county of Lafayette, State of Mississippi, have invented certain new and useful Improvements in Dental Matrices, of which the following is a specification.

My invention relates to that class of dental matrices in which wedge-shaped pieces are used for holding an auxiliary sheet, plate, or strip of metal at the side of one or more cavities in the tooth while it is being filled; and it consists in a construction and arrangement of parts, substantially as hereinafter set forth.

Referring to the accompanying drawings, Figure 1 is a side View illustrating an embodiment of my invention. Fig. 2 shows several forms of separators or wedges, and Fig. 3 shows one manner of applying my invention in actual practice. 7

My present invention is an improvement in the same general line and extension of my invention set forth in my previous application, Serial No. 33%,383, and is adapted to be made use of in filling cavities in teeth, more especially where the sides of the teeth have de-' cayed and it is necessary to construct an artificial wall or matrix to prevent the metal or other material used in filling the cavity from being forced out by the pressure applied in plugging or hammering it into. a compact mass to constitute the filling.

In my present invention the device consists of the carriers A B, each of which is made substantially of the shape indicated, and each being provided with a hub 2 for the reception of a screw-shaft O, which is preferably arranged to turn loosely in the hub of the carrier A, while the hub of the carrier B is threaded to engage the thread of the screwshaft. This screw is provided with an enlargement or projection I at one end, forming a shoulder, which bears against the loose jaw or carrier, and it may be rotated by a key fitting the squared portion J or by any other means. The carriers are preferably made U- shaped, as shown, in order that the device may be turned backward or forward over the teeth out of the way of the operator, as indicated in Fig. 3. The free ends of each carrier 0r j aw are provided with a screw-threaded pin a Z) or other eqnlvalent means to receive and support the wedge-shaped pieces Gr, which are provided with a screw-threaded socket or other similar means by which they may be detachably and interchangeably connected to the carriers. These wedges may be of any desired form and shaped to fit the contours of the different teeth, and many different shapes and forms may be provided, and each onehas means foroattaching it to the carrier, so that they are interchangeable. The sides of the wedges may be slightly concave or provided with wing-shaped projections g to cover the portion of the lingual or buccal surfaces of the teeth, and the points may be a trifle longer on one side than on the other in order to more nearly conform to the shape of the different teeth. The wings may be made of spring metal, so that they may more readily conform to the contour of the lingual and buccal surfaces, and,while not impinging upon the gums, they will reach the masticating or cutting surfaces or edges and inclose the two adjoining teeth as two half-hoops, or, of course, one winged wedge and one of any other form may be used.

I have found that the device as above described is exceedingly useful and convenient, especially with gold fillings, as it can be made to adapt itself closely to the cervical margin of the cavity and it does not have a tendency to draw away from the cavity as it is tightened, and the contour of the tooth can be readily restored. Sometimes I find it convenient to use in connection with it very thin pieces or strips or bands of German silver or similar flexible metal or alloy, which strips are placed between the teeth being operated upon adjacent the cavity and held in position by properly adjusting the wedges on the carrier and forming a support or matrix for the metal or other material with which the cavity is filled. If, perchance, there are two teeth adjacent each other, each of which has a cavity, or if they each have two cavities, as

indicated in Fig. 3, I make use of the shortthin strips D D, which are placed between the teeth, and then by applying the loops, bands, or strips H II, which bands are bent at their ends, as indicated at the point it, to

fit between the ends of the strips D D, and

applying the Wedges in the manner indicated in Fig. 3, the loops and strips canbe readily adjusted to properly bear against all four cavities F in the teeth E, and they can all be filled by one adjustment of the matrix. It will be observed that the U-shaped form of the car- 5 riers permits the shaft to be turned one side or the other out of the way of the operator, the screws or projections a b acting as pivots for the matrix.

Many other applications of my improved matrix will suggest themselves to those skilled in the art, and it will be seen that by making the wedges detachable and pivotally attachable to the carriers a great many combinations with the strips or matrices can be formed and the device adjusted so as not to interfere with the work of the operator, and, however used, it is convenient, simple, and applicable to a great many and practically all exigencies which can arise in this class of work.

WVhat I claim is 1. A matrix for dental purposes, consisting of the carriers and means for adjusting them and independent wedge-pieces connected to the ends of said carriers by screws, permitting 2 5 the adjustment of the carriers with relation to the wed ge-pi eces, substantially as described.

2. The combination of the carriers A B,

screw C, and wedges G, each of the latter connected to turn on the end of one of the carriers, substantially as set forth.

3. A matrix for dental purposes, consisting of a Wedge-piece provided with flexible wings, substantially as described.

4. A matrix for dental purposes, consisting of the carriers having wedge-pieces, the short metal strips, and the bands having bent por- NVILLIAM H. MARSHALL.

\Vitnesses:

G. R. HILL, M. A. MoN'reoMERY.