American dentistry.

  • American Dental Institute, Ltd.
Date:
[1888?]
Catalogue details

Licence: Public Domain Mark

Credit: American dentistry. Source: Wellcome Collection.

    27/56 (page 19)
    AMlCAN DENTAL INSTITUTE, LIMITED. 34, Thurloe Square, 8.W. IlONDON. 44, Finsbury Square, E.C. J and at BRIGHTON. 19 recommences, to say nothing of the fact that these fillings are not hard enough to long resist the wear of mastication, or the friction of the tooth brush. Gutta percha, properly made, mixed with ground glass and properly applied, is really a good filling in certain cavities. It is useful where neither mastication nor tooth brush can touch it, but it will not resist the wear of either, and for many reasons it is only suitable in a few cases, except for temporary purposes. Amalgams are mixtures of various metals with mercury, and whilst hardening by a chemical combination they either shrink or ex¬ pand. If they expanded they would burst the tooth, so they are made just to shrink, and however carefully applied the edge of the amalgam shrinks from the