. The principles and practice of dental surgery. the lower jaw pre-sents with the last-named apparatus upon it, and will better con-vey an idea of its construction, Pj^^ ^3the manner of its application,and its mode of action, thanany description which can begiven. An appliance of this sortmay be made to act with greatefficiency in remedying the de-formity in question; but, inits application, it is necessarythat the caps be fitted with the greatest accuracy to the teeth,and they should be removed every day and thoroughly cleansed,as well as the teeth they cover. If this precaution is neglected,
. The principles and practice of dental surgery. the lower jaw pre-sents with the last-named apparatus upon it, and will better con-vey an idea of its construction, Pj^^ ^3the manner of its application,and its mode of action, thanany description which can begiven. An appliance of this sortmay be made to act with greatefficiency in remedying the de-formity in question; but, inits application, it is necessarythat the caps be fitted with the greatest accuracy to the teeth,and they should be removed every day and thoroughly cleansed,as well as the teeth they cover. If this precaution is neglected,the secretions of the mouth, which collect between the gold capsand teeth, will soon become acrid and corrode the latter. The remarks made in the previous chapter upon the use ofthe vulcanite are applicable here. Such a plate, for this class ofcases, is readily made, and inflicts no injury upon teeth or , instead of silk, ligatures might be used, and the retrac-tion of the incisors carried on simultaneously with that of CHAPTER OF THE LOWER JAW. This deformity, altliough produced by a different cause fromthe one last described, is similar to it, and gives to the lowerpart of the face an unnatural and sometimes disagreeable ap-pearance. It also interferes with mastication, and of>en withprehension and distinct utterance. It wholly changes the rela-tionship which the teeth should sustain to each other when themouth is closed. The cusps or protuberances of the bicuspidsand molars of one jaw, instead of fitting into the depressions ofthe corresponding teeth of the other, often strike their mostprominent points; at other times the outer protuberances of thelower molars and bicuspids, instead of fitting into the depres-sions of the same class of teeth in the upper jaw, shut on theoutside of these teeth. The trituration of aliments is conse-quently rendered more or less imperfect. This protrusion of the lower jaw is supposed by some to
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