A practical treatise on artificial crown- and bridge-work . ger used to form the tube for the telescopingcrown. When desirable, the seamless collar can be strength-ened, after it has been adapted to the conformation of the crownso as to slide freely over it, by investing and flowing solder overthe outer surface; or, still better, by adapting the next largersize of collar to exactly fit around the first, and then investing Fig. 491. the two and soldering them together. The advantages of thesecoUars for this kind of work, and also for the construction ofcap crowns, are obvious. The other applian
A practical treatise on artificial crown- and bridge-work . ger used to form the tube for the telescopingcrown. When desirable, the seamless collar can be strength-ened, after it has been adapted to the conformation of the crownso as to slide freely over it, by investing and flowing solder overthe outer surface; or, still better, by adapting the next largersize of collar to exactly fit around the first, and then investing Fig. 491. the two and soldering them together. The advantages of thesecoUars for this kind of work, and also for the construction ofcap crowns, are obvious. The other appliances specially devised for this system are, areducing-plate or contractor, a pair of collar pliers, and ahammer. The contractor (Fig. 491) contains holes which are comple- THE MANDREL SYSTEM. 249 iiientary in shape to the mandrels. The mandrels heing ai)pliedto the inner circumferences of the collars, while the contractormust admit the collars themselves, the short taper of the holesin the contractor necessarily covers a somewhat greater range of FiQ. siz*. than is shown in the mandrels. With this ap[>liance collarscan !)(, evenly and accurately reduced in size at the edges, with-out burring or buckling. The illustration is actual size. The collar pliers (Fig. 492) are for contouring the collars toshape, one beak being made convex and the other concave to 250 ARTIFICIAL CROWN- AND BRIDGE-WORK. Fig. 493.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
