The Dental cosmos . the pin baked in the porce-lain and with removable pin. It wouldseem that this crown could replace withprofit many of the hand-made crownsnow in use. The cap backing with itsinner pin should always be used withsmall or weak roots. BRIDGING OF TEETH. Turning now to the remaining portionof the subject, we will take up the con-struction of bridges by the aid of thehollow pin crown. You will no doubthave observed that the metallic cap back- 1248 THE DEXTAL COSMOS. ing furnishes the starting-point forbridge work. This with the other possi-bilities of the crown as pointed out all
The Dental cosmos . the pin baked in the porce-lain and with removable pin. It wouldseem that this crown could replace withprofit many of the hand-made crownsnow in use. The cap backing with itsinner pin should always be used withsmall or weak roots. BRIDGING OF TEETH. Turning now to the remaining portionof the subject, we will take up the con-struction of bridges by the aid of thehollow pin crown. You will no doubthave observed that the metallic cap back- 1248 THE DEXTAL COSMOS. ing furnishes the starting-point forbridge work. This with the other possi-bilities of the crown as pointed out allowsof a great variety of results. The different kinds of bridges thatmay be constructed by this method arebest divided into three types—permanent, These will now be pointed out, at leastas far as they are considered essential. First, when it comes to articulatingthe crowns, allowance must be made forthe cap backings later to be applied. Secondly, in making the cast, a goodnon-shrinking investment compound Fig. Ordinary backings with facings, and abutments with cap backings. Fig. 7.
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