. The principles and practice of dental surgery. , it is produc-tive of injury, by exciting a very decided galvanic action. Asa general rule, therefore, a piece may be said to be much betterwithout than with it. For a description of the process of electro-gilding, the reader is referred to works devoted especially to thesubject. In mounting a set of teeth for the lower jaw by the Cheoplasticprocess, the gate through which the metal is poured into thematrix should have two lateral branches, one on each side, toadmit it more freely than one can be made to do. The waxplate should also be thicker,
. The principles and practice of dental surgery. , it is produc-tive of injury, by exciting a very decided galvanic action. Asa general rule, therefore, a piece may be said to be much betterwithout than with it. For a description of the process of electro-gilding, the reader is referred to works devoted especially to thesubject. In mounting a set of teeth for the lower jaw by the Cheoplasticprocess, the gate through which the metal is poured into thematrix should have two lateral branches, one on each side, toadmit it more freely than one can be made to do. The waxplate should also be thicker, to give sufficient strength and sta-bility to the base, but in every other respect the method ofprocedure is almost precisely the same as that described for anupper set. For a partial lower set, say for the molars and bi-cuspids on each side, the wax plate should be extended behindthe remaining front teeth, and two or three thicknesses may beapplied here to stiffen it sufficiently to prevent it from breaking CHEOPLASTIC PROCESS. 795 Fig. 28!).. or bending when pressure is made on the teeth of the base oneach side. In making an antagonizing model (Fig. 289) for an entire setof teeth, the wax plate forthe lower jaw is stiffened bythe adjustment of a piece ofiron wire about double the•liameter of a medium sizedknitting-needle, bent to thecurvature of the arch, andmade fast to the inner edgeof the plate, by being par-tiallv imbedded in it. The rim of wax is now arrantred alongthe summit of the alveolar borders, and after being properlytrimmed, it is taken from the model and put in the mouth. Theupper plate and rim of wax is then adjusted, the bite of themouth taken, and the antagonizing model made in the mannerdescribed for a full set of block-teeth to be mounted on gold. In Fig. 290 is represented a double set of teeth arranged inwax upon an antagonizing Fg- -90- model, the upper and lower ready to be placed upon their • >|\ respective models for theformation of matrices.
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