A practical treatise on artificial crown- and bridge-work . 156 ARTIFICIAL CROWN- AND BRIDGE-WORK. upper edge of the teeth shall press lightly on the gum. Thosewhich are intended to form the fronts of the caps on the cuspidroots should be adjusted in the ordinary manner for singlecrowns. To determine the proper positions of the teeth forproducing the best appearance, they can be adjusted in the mouthon wax, without the gold crowns or caps of the correct position of the teeth on the model having beenobtained, investing material, composed of one part plaster to-two of calcined marbl
A practical treatise on artificial crown- and bridge-work . 156 ARTIFICIAL CROWN- AND BRIDGE-WORK. upper edge of the teeth shall press lightly on the gum. Thosewhich are intended to form the fronts of the caps on the cuspidroots should be adjusted in the ordinary manner for singlecrowns. To determine the proper positions of the teeth forproducing the best appearance, they can be adjusted in the mouthon wax, without the gold crowns or caps of the correct position of the teeth on the model having beenobtained, investing material, composed of one part plaster to-two of calcined marble-dust, is placed on the outside of themodel on the labial aspect of the teeth, merely sufficient in Fig. 300. C A. A and B, central incisor aiitl bicuepid ready for metallic backing. C, is a central , D, D, porcelain fronts as they appear on insertion after the process of backing, capping, andsoldering. quantity to hold them in position, thus forming a wax is then removed, exposing the palatal portion, andpermitting their form and position to be studied (Fig. 300).The porcelain teeth and fronts, with the exception of frontafor the roots capped, are then removed from their invest-ment, and the base ground from a line on the palatal sidebelow the pins, straight to the labio-cervical edge (A and B, ). This is to form the self-cleansing spaces, if they are CONSTRUCTION OF BRIDGE-WORK. 157 tksired. The incisors are then backed, using either very thinphitinum or pure gokl (C). The hackings are allowed to extendjust over the incisive edge as a protection to it, and, if preferred,down on tlie curve of the self-cleansing space. A more desirableresult is secured if the backing exte
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
