Dental cosmos . aving been left a little high, or just above the gum, the platinumcan be split with scissors, lapped, and burnished around the exposedside of the root, to form a partial band (Fig. 4). After having dried the wax with bibulous paper, and shaped up theapproximal sides, these sides are covered with small, triangular piecesof platinum (Fig. 5), by laying the platinum on the wax and rubbingover it a hot burnisher. The crown is now ready to invest, and theinvesting mixture is poured on a small piece of wire netting, whichwill prevent its cracking during the soldering operation. The w
Dental cosmos . aving been left a little high, or just above the gum, the platinumcan be split with scissors, lapped, and burnished around the exposedside of the root, to form a partial band (Fig. 4). After having dried the wax with bibulous paper, and shaped up theapproximal sides, these sides are covered with small, triangular piecesof platinum (Fig. 5), by laying the platinum on the wax and rubbingover it a hot burnisher. The crown is now ready to invest, and theinvesting mixture is poured on a small piece of wire netting, whichwill prevent its cracking during the soldering operation. The waxhaving been burned out, this triangular box is filled flush with solderin the usual way and polished. The result is a beautiful and perfectcrown, in every respect the most substantial porcelain crown we have. I frequently make the crown without using the triangular piece ofplatinum to form the box (Fig. 5), relying on the investment to formthe sides. This saves a little time ; but it frequently happens, unless. THE DENTAL COSMOS. care has been taken to make the wax flush, that the approximalsurfaces are not well rounded, and consequently do not finish is therefore safer to use the triangular pieces of platinum foil toform the sides of the box as described, before filling with solder. Thisplan is particularly adaptable to those cases of fracture which haveresulted in a rough root-end, and where it is often next to impossibleto get them smooth. Where it is convenient, or if it is desired, the triangular box can befilled with body, and baked in a Parker furnace from six to eightminutes. This gives us an all-porcelain crown which fits perfectly tothe end of the root. In this case the first disk next the porcelain isleft off entirely. If the manufacturers could be prevailed upon to give us a tooth ofthis shape, it would greatly facilitate the operation of making a perfect-fitting and beautiful crown by this method as described. Yesterday, To-Day, and To-Morrow.:: BV W. C B
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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectdentistry
