US1921613A - Dental bridge - Google Patents

Description

Allg. 8, y H FREEDMAN DENTAL BRIDGE Filed April 28, 1950 INVENTOR ATTORNEYS portion of said stud is of substantially the same dimensions as the recess'in the box into which it extends so as to provide a snug t which will, at the same time, permit of the desired slight movement of the articial tooth during Vmastication. In order to t into the box 16, the stud extends diagonally from the tooth 11 at an inclination of about 15 to the horizontal and has its outer end beveled so that it Will engage flush against the vertical bottom of the recess in its box. By supporting the tooth 11, or a number of such teeth, in this manner a two-fold advantage is obtained. Firstly, the strain upon the natural tooth is concentrated toward the foundation thereof where it can better withstand the pressure applied to the articial tooth, and secondly, the inclinationrof the studs 17 and their engagement with the similrlyinclined walls of the boxes 16 prevent any possible drifting of the natural teeth by reason of the pressure thereagainst.

'l The casting 18 surrounding the artificial tooth has its under surface sloped, as best indicated in Fig. 6, so that only the front portion of the toothengages the gum, this being'known as a sanitary slope and enabling the passage of a tooth brush for cleansing purposes. The slope of said casting provides a space between it and the gum and when more than 'one articial tooth is employed in a bridge, it may be desirable to support said. teeth by means of a saddle inserted into said space. Such a construction is shown in Figs. 5 and 6, wherein, for purposes of simplicity in illustration, only one artificial tooth is shown. It Will be understood, however, that the saddle 19 employed is made sufficiently Wide to extend beneath Vand support all of the artificial teeth in any bridge.

In the present construction the saddle is removable while the bridge work proper is permanent and in order to detachably mount said saddle the same is provided with the resilient projecting prongs 20 which are adapted to be engaged in a box 21, similar to the box 16, and recessed within the casting 18. rictionally engage opposed walls of said box 21 and thus assist in retaining the saddle in proper position relative `to the teeth 11.

What is claimed is:-- ,v

'1. A movable permanent dental bridge, comprising an inlay attached to a natural tooth and having a recess in its pulpal vwall which is inclined in a direction toward the foundation of said tooth, an artiiicial tooth, and a support for the latter tooth which extends therefrom in an inclined direction coincident with the inclination of said recess and which projects into the saine, there vbeing a relative movement between said support and the Walls of said recess .to enablev the artificial tooth to move during mastication.

2. A movable permanent dental bridge,V comprising an inlay attached toa natural tooth, a box embedded in the Vpulpal wall of said inlay and having its walls inclined in the direction of the foundation of said tooth and its bottom parallel with the vertical axis thereof, an artiiiv Said prongs

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