. The principles and practice of dental surgery. ooth, and sometimes even the alveolo-dental periosteum. Theauthor, in common with other dentists, was in the habit of doingthis for a long time; but, observing the bad effects produced byit, he abandoned the practice many years ago, and has since, innearly all cases, left a space of never less than an eighth of aninch, and often much more, between the plate and the teeth be-hind which it passed. A correct idea may be formed of themanner in which a central incisor is thus arranged by an exami-nation of Fig. 239. It will be seen that the lateral c
. The principles and practice of dental surgery. ooth, and sometimes even the alveolo-dental periosteum. Theauthor, in common with other dentists, was in the habit of doingthis for a long time; but, observing the bad effects produced byit, he abandoned the practice many years ago, and has since, innearly all cases, left a space of never less than an eighth of aninch, and often much more, between the plate and the teeth be-hind which it passed. A correct idea may be formed of themanner in which a central incisor is thus arranged by an exami-nation of Fig. 239. It will be seen that the lateral curve ofthe plate is in the opposite direction from the curvature of thedental arch, thus giving proximity to the teeth only where it isunavoidable. A lateral incisor, cuspid or bicuspid may be ap-plied in the same way; and if the second bicuspid or first molaris unfit, from its shape or from decay, to be clasped, the platemay be extended to the second molar, or it may be even carriedacross the mouth, and clasped to a tooth on the opposite 710 TWO CENTRAL INCISORS WITH CLASPS. CENTRAL INCISOR WITH TWO CLASPS. Cases will frequently occur in wliich it may be necessary to employ two clasps for theFig. 240. ^ « . , . support 01 a single incisor. The accompanying cut () will indicate the de-scription of plate most pro-per to be used. The plate,as here shown, is extendedback to the first molar oneach side, to which it is se-cured by suitable clasps. When two clasps are used, it is notessential that so much of the tooth should be grasped by theclasp. In some cases, the piece will be firmly retained by shortclasps, bearing against the lingual third of the tooth, providedthe surface is so shaped as to allow their retention. Such par-tial clasps are called stays, and are often used in connectionwith an atmospheric-pressure plate to prevent lateral motion. When the patient is very intolerant of the presence of muchmetal in the mouth, one or two teeth may sometimes be securel
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