US2438725A - Dental inlay - Google Patents

Description

March 30, 1948. ,Q H. TAMARlN 2,438,725

DENTAL IN LAY Filed April so, 1945 hun y M Patented Mar. 30, V1948 UNITED STATES DTENT QFFICEv DENTAL INLAY Abraham H. Tamarin, Chicago, Ill.

Application April 30, 1945, Serial No. 590,996

2 Claims. 1

The invention relates to dental inlays made of any suitable material such as precious metal or plastic material and to the method of securing the inlay against dislodgement.

The securing of inlays has always formed a difficult problem and many attempts were made to prevent the dislodgement and loss of inlays.

The employment of pins or posts and the use of special cements have contributed little, if anything, in permanently securing an inlay.

It is, therefore, one of the main objects of the invention to provide an inlay which is permanently secured to a tooth and is retained in such position for the life, of a tooth, so that the inlays may be used .as an abutment for bridgework.

Another object constitutes the provision of an anchor which is embedded in the tooth and formed integral with the inlay so that the adhesive eiect of a cement is only partly relied upon to secure the inlay against dislodgement.

With these and other important objects in view which will become apparent from a perusal of the invention, the latter comprises the means and the method of applying the means set forth in the specification, particularly pointed out in the claims .forming a part thereof, and illustrated in the accompanying drawing, in which Fig. 1 is a perspective View of an anchor constructed in accordance with my invention.

Fig. 2 is a cross section through a tooth in the process of applying my improved inlay.

Fig. 3 is a top plan view of a tooth pr-ovided with an inlay.

Fig. 4 is a section similar to Fig. 2 with the improved inlay applied.

Figs. 5 to 7 are elevational views of drilling and burring tools employed in carrying out my invention, and

Fig. 8 is a perspective view showing an inlay to be applied to a tooth.

The invention may be applied to distocclusal as well as mesiocclusal inlays and broadly provides an anchor which protrudes Vfrom the inlay and is received in an auxiliary cavity where a body of cement is trapped which holds the anchor and prevents loosening or dislodgement of the inlay. v

Referring to the drawing Iii generally designates a tooth which has a cavity lI I to which an inlay is to be applied.

As shown in Figs. 2 and 4 the tooth is provided with a hole I2 which at the lower part is widened as at I3 designing a chamber and producing shoulders I4.

The hole I2 is provided to receive an anchor 2 generally designated by I5 and comprising a cylinder I5 from which extend at the 4longitudinal center pins I'I and I8 terminating in a head i9 and 2G respectively.

Attention is called to the fact that the cylinder and the headed pins each are 1 mm. long so that the total length of the anchor pass does not eX- ceed 3 mm.

These dimensions have been found practical and are given merely by way of example and not as a limitation.

The -cylinder is formed with a longitudinal groove 2l and the heads I 9 and 2B each have a marginal groove or peripheral recess 22 for a purpose hereinafter to be referred to.

In carrying out the invention the tooth is provided with the auxiliary hole I2 which is formed with a drill 23 having a shoulder forming an abutment to prevent excessive penetration of the drill into the tooth.

The operative part 25 of the drill has substantially two-thirds of the length of the anchor post .and upon insertion of the anchor post into the hole, the pin IB and its head extend into the cavity II.

A bur 26 is employed which also has a shoulder 21 to prevent excessive penetration for dressing the bottom of the lrole I2. Finally a bur 28 having a thin stem 29 enables the diameter of the lower part of the hole I2 to be increased whereby shoulders I4 are formed.

'I'hereupon the anchor post is inserted in the hole I2 so that the top surface of the cylinder I6 is iiush with the bottom of cavity I2. The cylinder I6 serves as a guide means when inserting the post.

Thereupon wax is pressed into the tooth whereby the head 2l) and pin I8 become embedded in the wax.

Upon removal of the wax pattern the anchor post is carried along and the inlay 30 cast, resulting in an integral structure of inlay and anchor post I5.

The cavity and the functional inlay surfaces as ywell as the anchor post are covered with cement.

In mounting the inlay excessive cement may escape through the grooves 2|, 22.

Upon hardening the cement in chamber I3 forms a block 3l connected by the post I5 with the inlay 30 and bearing against shoulders I4 extending at right angles to the post I5 to effectively prevent any dislodgement or loosening of the inlay.

The inlay shown in Fig. 8 has two anchor posts I5 if double 4anchorage is desired.

The inlay thus secured may serve as an abutment for bridgework with the same assurance of retention and security as a crowned tooth, since the block of cement trapped in the chamber I3 forms a rigid assembly, with the post and inlay.

Attention is called to the fact that the anchor may be employed for distocclusal or mesiocclusal inlays regardless of ease or diculty of access to the cavity.

While the drawing disclosesrone embodiment of the invention numerous changes and alterations may be made without departing from the Ispirit of the invention. I,'therefore, do not limit myself to details of construction or arrangement of parts as shown, but claim my invention as broadly as the state ofthe art permits.

I claim:

1. A dental anchor comprising a cylindrical portion formed with pins longitudinally extending from the center thereof, and provided with heads at the free end, said cylindrical portion and heads being provided with a peripheral groove parallel to the longitudinal axis to provide a channel.

2. For use with an inlay of precious or semiprecious metal to be applied to a tooth in situ, a dental anchor comprising a cylindrical portion formed with pins longitudinally extending from the center thereof, and provided with heads at the free end, said cylindrical portion and heads being provided with a peripheral groove parallel to the longitudinal axis to provide a channel, said anchor being adapted to be cast to said inlay affording the securing of said inlay and said anchor as a unit to the tooth.

ABRAHAM I-I. TAMARIN.

REFERENCES CITED The following references are of 4record inthe

Images