. A manual of mechanical dentistry and metallurgy . to induce the plaster to run around the teeth perfectly andto force the air out. After the flask is well filled, the toppiece should be placed in position and forced home, whichw^ill drive out any surplus plaster; this pressure should becontinued until the plaster has thoroughly set. Fig. Where deep undercuts are present, one of two processesmay be adopted. They are well described in the late Beales article in the American System of Den-tistry, where he says: First, the plaster in the lower FLASKING, VULCANIZING AND FINISHING.

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. A manual of mechanical dentistry and metallurgy . to induce the plaster to run around the teeth perfectly andto force the air out. After the flask is well filled, the toppiece should be placed in position and forced home, whichw^ill drive out any surplus plaster; this pressure should becontinued until the plaster has thoroughly set. Fig. Where deep undercuts are present, one of two processesmay be adopted. They are well described in the late Beales article in the American System of Den-tistry, where he says: First, the plaster in the lower FLASKING, VULCANIZING AND FINISHING. 47 section may he made to cover the wax rim within half aHne of the porcelain gnms. This will protect the cast, sothat it will not he fractured when parting the flask or whenpacking the rubher. This method is represented in Or, the base of the cast may be so trimmed that theundercut will approach as nearly as possible the perpendic-ular, as seen in Fig. 23. When the latter plan is adopted Fig. 23.

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Keywords: ., bookcentury1900, bookdecade1900, bookidman, booksubjectmetallurgy