Licence: Public Domain Mark
Credit: Dental mechanics / by Harry Rose. Source: Wellcome Collection.
Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.
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![where it impinges on ihe tooth and should taper both upwards and backwards. The rapid expansion of compressed wood to its original length proves most conclusively that the plate should be firm- ly secured to several strong teeth, to resist the force at any rate until the tooth begins to move. With short teeth, pegs are often more useful than springs, as they are not so likely to get disarranged or misplaced. In all cases it is as well that the bite should be so raised that the tooth or teeth to be operated on may pass freely forward without coming into contact with the opposing teetb. ]n some cases, more especially in the upper jaw, where a front tooth has a decided slant inwards, a peg cannot be used with effect, as the projecting peg would not clear the point of the tooth and touch the back. This is a case in which compressed wood could be employed with advantage. Nor is a tooth with much of a slant outwards suitable for pegging, as there would be a tendency to shorten it instead of pressing it forwards. In the first of these cases we may also adopt the following method. Dry the plaster model and while warm paint it with chloro- rubber, then adapt a soft rubber plate to it to the size required, bringing it over the molars and second bicuspids. Next take a piece of hard gold or German silver wire about half the thickness of pin wire and bend it so as to conform to the arch of the front teeth. The ends are now flattened, and after being warmed are pressed into the soft rubber and vulcanized. Fig. 17 repre- sents such a plate. When finishing the plate up the rubber is cut away from the back of the misplaced tooth, and a small](https://iiif.wellcomecollection.org/image/b21449727_0354.jp2/full/800%2C/0/default.jpg)
