. The principles and practice of dental surgery. ver the insertion ofthe cheek muscles, on the outside of the ridge or the palatemuscles at the back of the mouth, the gums will be chafed orulcerated, the patient nauseated, and the piece rendered unstableby the action of the muscles. Unless it be made to touch everyportion of the surface which it covers, it will be constantly liableto drop. It is not always necessary to employ a very wnde plate tosecure a sufficient amount ofsuction for its retention. A com-paratively narrow one may oftenbe made to adhere with verygreat tenacity to the gums. Bu
. The principles and practice of dental surgery. ver the insertion ofthe cheek muscles, on the outside of the ridge or the palatemuscles at the back of the mouth, the gums will be chafed orulcerated, the patient nauseated, and the piece rendered unstableby the action of the muscles. Unless it be made to touch everyportion of the surface which it covers, it will be constantly liableto drop. It is not always necessary to employ a very wnde plate tosecure a sufficient amount ofsuction for its retention. A com-paratively narrow one may oftenbe made to adhere with verygreat tenacity to the gums. Buta plate of this kind is more liableto be bent, and lose its perfectadaptation to the parts than awide one, unless made of thickergold. Its liability to be injured,however, in this way, may bemeasurably prevented by extending a piece closely fitting thepalatine arch, across from one side to the other, (Fig 249,) inmanner recommended by Dr. Roper for certain partial cases.(Fig. 244.) In this way, great stability may be given to a plate Fig. 722 TKETH RETAINED BY ATMOSPHERIC PRESSURE. fur an upper circle of teeth, without encumbering the mouthwith a witle phite. It might also be used with great advantagein cases where it is necessary to employ spiral springs. The successful application of artificial teeth, upon this prin-ciple, depends upon having the plate accurately adapted to theparts upon which it is to rest. But however accurately a platemay be made to fit the model or metallic die, it is sometimeswarped in soldering the teeth to it, thus destroying its adapta-tion and causing it to rock when placed in the mouth. Whenthis happens, it cannot be made to adhere to the gums, and con-sequently cannot be worn with comfort. For the restoration ofthe plate, a variety of means have been proposed. The onewhich the writer has found most successful, consists in bindingit to the plaster model with a fine iron wire in such a way thatit shall be made to touch every part it covers; th
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