A practical treatise on mechanical dentistry . f one or two bicuspid teeth on eachside, is described by Professor Taft, the design of which is tosecure in such cases increased stability of the substitute, while 198 PARTIAL DENTURES HELD BY ATMOSPHERIC PRESSURE. 199 much of the palatal arch is left uncovered. It consists of two lat-eral cavity plates accurately adjusted to the sloping walls of thepalate on each side, immediately adjoining and partly occupyingthe spaces to be supplied. These lateral plates may be made aslarge as a dime, or somewhat larger, and of an elliptical shape ifboth bicus
A practical treatise on mechanical dentistry . f one or two bicuspid teeth on eachside, is described by Professor Taft, the design of which is tosecure in such cases increased stability of the substitute, while 198 PARTIAL DENTURES HELD BY ATMOSPHERIC PRESSURE. 199 much of the palatal arch is left uncovered. It consists of two lat-eral cavity plates accurately adjusted to the sloping walls of thepalate on each side, immediately adjoining and partly occupyingthe spaces to be supplied. These lateral plates may be made aslarge as a dime, or somewhat larger, and of an elliptical shape ifboth bicuspids on the same side are to be replaced, and are con-nected with each other by a narrow band of gold plate, two linesor more in width, having an anterior curvature, and resting on thefront wall of the palate, two or three lines behind the anteriorteeth. The entire appliance may be constructed from a singlepiece of gold plate swaged accurately to the parts; or the lateralplates and connecting band may be separately swaged and secured Fig. in their proper relation to each other in the mouth with wax orplaster, when they are carefully removed, invested, and solderedtogether; it should then be reswaged to correct any change of re-lation that may have happened during the concluding manipula-tions. The liability of the plate to ride upon the central and raisedportion of the palate, when pressure is made upon one side, throw-ing the plate off from the ridge on the other, as in the case of abase extending across the arch, is in a great degree obviated bythe method just described. Manner of Forming an Air-chamber.—Atmospheric-pressureplates for partial cases are constructed with a central air-cham-ber ; in which case, the part of the model representing the chamber 200 MECHANICAL DENTISTRY. may be formed in either of the ways mentioned in the chapter onPlaster Models. The model prepared, the form of the plate to beused is first indicated thereon, and from this a pattern in sheet-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
