A practical treatise on artificial crown- and bridge-work . ge the root-eanal so thata threaded pin of proper size will pass in easily, par-^ tially fill the canal with zinc phosphate, and press theA pin to its place with pliers. The crown should then beU filled with zinc phosphate and pressed to its place, carebeing taken to hold it in jiosition until the cementsets (Fig. 83). If any operator distrusts the ability ofzinc phosphate to make a perfect joint, a small <[uan-tity of silver amalgam or gutta-perc-ha can beised to ^^- ^- ^^- ? ^^°- ^-advantage. This crown is strong, andduring its
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A practical treatise on artificial crown- and bridge-work . ge the root-eanal so thata threaded pin of proper size will pass in easily, par-^ tially fill the canal with zinc phosphate, and press theA pin to its place with pliers. The crown should then beU filled with zinc phosphate and pressed to its place, carebeing taken to hold it in jiosition until the cementsets (Fig. 83). If any operator distrusts the ability ofzinc phosphate to make a perfect joint, a small <[uan-tity of silver amalgam or gutta-perc-ha can beised to ^^- ^- ^^- ? ^^°- ^-advantage. This crown is strong, andduring its test of severalyears none have broken sofar as known. The mode ofM M fasteiiiui:: is stron:, and has S gat ~ O the advantage of two pins when set on a bicuspid havingtwo root-canals. It is simple, and when set—no metal being insight—it is a perfect imitation of the natural tooth (Fig. 84). THE LOGAN. BROWN, AND NEW RICHMOND CROWNS. These crowns have their platinun) posts or pins baked in thebody of the porcelain, hi the Logan crown the base is made.