. The principles and practice of dental surgery. The very fact that so many hundred different sol-ders work so well, goes far to prove what we have said. Rulesfor the management of solder, plate and blow-pipe in the act ofsoldering, will be hereafter described. CHAPTER EIGHTH. CUPS AND MATERIALS FOR IMPRESSIONS OF THEMOUTH—PLASTER MODELS. In the construction of a dental substitute, mounted upon a plateor base, it is necessary to obtain an exact model of the parts uponwhich it is to rest, and to which it is to be attached. Beforethis can be done, a perfect impression of these parts in somesoft
. The principles and practice of dental surgery. The very fact that so many hundred different sol-ders work so well, goes far to prove what we have said. Rulesfor the management of solder, plate and blow-pipe in the act ofsoldering, will be hereafter described. CHAPTER EIGHTH. CUPS AND MATERIALS FOR IMPRESSIONS OF THEMOUTH—PLASTER MODELS. In the construction of a dental substitute, mounted upon a plateor base, it is necessary to obtain an exact model of the parts uponwhich it is to rest, and to which it is to be attached. Beforethis can be done, a perfect impression of these parts in somesoft arid yielding substance must be procured. There are several materials which may be used for this pur-pose, each possessing certain advantages over the others. Theyare: ivax, gutta-percha and plaster of paris; to which may beadded a mixture of Avax and paraffine, and a mixture of waterand gutta-percha. These materials must be contained in a cup of such size andshape as to permit easy introduction into the mouth; to be read- FiG. 188. Fig.
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