The anatomy, physiology, and diseases of the teeth.

  • Thomas Bell
Date:
1831
Catalogue details

Licence: Public Domain Mark

Credit: The anatomy, physiology, and diseases of the teeth. Source: Wellcome Collection.

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    off; and they should be drawn very tightly, especially that around the irregular tooth. As this. part of the bar stands forward from the toeth, and as, al- though strong, it should still be elastic, there will be a constant force acting upon the tooth, tending to bring it forwards. The closing of the jaws is to be prevented by a method less complicated, and less liable to derange- ment, as well as firmer and more comfortable to the patient than the one formerly in use. It consists of a simple cap of gold, made to fit, very accurately, to a molar tooth either of the upper or lower jaw; I have usually found the former the most eligible. The cap should extend as far as the neck of the tooth on each side, and should be accurately adapted to all the irre- gularities of the surface, by being stamped between a brass cast of the tooth and a hollow cast of lead. It is made of gold, containing such a portion of alloy as to render it hard and elastic. When it 1s applied, the edges which are adapted to the neck of the tooth are to be bent a little inwards, so that some force is re- quired to press them over the convexity of the crown; they will then spring into the depression at the neck, and the cap will remain perfectly firm in its situation, if accurately made and properly applied. The thick- ness of the surface must be sufficient to prevent the lower front teeth from interfering with the operation of bringing the irregular upper one forwards, by means of the bar. The ligatures should be replaced about every other day, and the bar should be wholly removed whenever this is done, in order to cleanse it; as it otherwise be- comes offensive, and irritates the edges of the gum.
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