A practical treatise on mechanical dentistry . contact of the latter with theunchanged surface of the plaster model. After final swaging, the plate should be again annealed with aheat nearly or quite equal to that which will be ultimately re- ENTIRE DENTURES ATTACHED TO SWAGED PLATE-BASE. 235 quired in soldering. After this, any additional swaging shouldbe avoided, unless the plate warps in the heat, which may be de-termined by applying it to the die. If any change has occurred,it should be reswaged, and again annealed at a high heat, and theoperation should be repeated, if necessary, until th
A practical treatise on mechanical dentistry . contact of the latter with theunchanged surface of the plaster model. After final swaging, the plate should be again annealed with aheat nearly or quite equal to that which will be ultimately re- ENTIRE DENTURES ATTACHED TO SWAGED PLATE-BASE. 235 quired in soldering. After this, any additional swaging shouldbe avoided, unless the plate warps in the heat, which may be de-termined by applying it to the die. If any change has occurred,it should be reswaged, and again annealed at a high heat, and theoperation should be repeated, if necessary, until the plate retainsits integrity of form after the last annealing. This process offinal heating does not apply to silver if in the form of a swagedplate, as this metal invariably suffers some change of form whensubjected to an annealing heat. Modifications in the Form of Plates for Entire Upper Dentures.—Whenever a central air-chamber is employed, it may be con-structed in either of the ways described when treating of partial Fig. 97. Fig. atmospheric-pressure plates. The general form of an entire up-per denture with a central chamber is exhibited in Fig. 97. Othermodifications in the form of cavity-plates for full upper sets arein limited use, as where chambers are arranged one on each sideof the sloping walls of the palate, or directly over that portion ofthe ridge previously occupied by the anterior molar and the bicus-pids on each side, as seen in Fig. 98, called lateral their general utility may be, cases doubtless occurwhere they may be advantageously employed; separately, asshown in the illustration, or in combination with the centralchamber, as when any great inequality exists in the hardness ofthe ridge and palate, such as cannot be readily overcome by ordi-nary means. These lateral cavities or chambers are not cut outand soldered as is sometimes done with the central cast, and consequently the die, is raised or built up slightly
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
