The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / by Chapin A. Harris.

  • Harris, Chapin A. (Chapin Aaron), 1806-1860.
Date:
1906
Catalogue details

Licence: Public Domain Mark

Credit: The principles and practice of dentistry : including anatomy, physiology, pathology, therapeutics, dental surgery and mechanism / by Chapin A. Harris. Source: Wellcome Collection.

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    be made) by judicious use of the corundum wheel, but the block here given is invaluable in such cases. The left upper block is an admira¬ ble imitation of a very usual arrangement of incisors, resulting from crowded dentition; the drawing gives a very imperfect idea of the great beauty of the original porcelain block. When the facial expres¬ sion indicates its use, it will have great effect in disarming suspicion of artificiality—a very desirable quality in artificial dentures. In Fig. 1186 we have very convenient modifications to suit front spaces of two or four teeth, the set of four being in two blocks. The peculiarity of these blocks is the lateral finish of the gum ; instead of a square joint, for fitting to an adjoining block, they have a rounded edge of gum color that can be adapted to the curves of the absorbed natural gum. There should also be blocks of two, a lateral and cen¬ tral, with gum shaped like the double central, as such spaces are of frequent occurrence. Besides the four forms of teeth here given there Fig. 1187. are many other varieties in size and shape of this very useful kind of block. Figs. 1187, 1188, and 1189 represent a few of the great variety of forms of upper incisors and canines designed to meet the demands of an esthetic discrimination. In Fig. 1187 we have, first, along, deli¬ cate lateral, with sloping but not rounded edge, showing a decided space between it and the cuspid and central; then we find it wider, with corners and edge rounded and filling the space. Lastly, for want of space, the laterals, although long and narrow, overlap the centrals ;