Principles and practice of operative dentistry . improved gutta-perctool-heater. Dental Cosmos, vol. xxxiv. p. 2S1. MANIPULATION AND INTRODUCTION OF PLASTIC FILLING-MATERIALS. 335 operation, but if the metal in the mean time loses its fluidity and thusindicates the lowering of the temperature, it can be restored by hold-ing the heater for a moment over the flame until the metal again becomesfluid. Fig. Dr. Hows thermoscopic heater. When the metal disk is fused the pellets 1, 1, will be at a temperatureof about 212° F., while pellets at 2 would have a temperature of about 200°F., and thos
Principles and practice of operative dentistry . improved gutta-perctool-heater. Dental Cosmos, vol. xxxiv. p. 2S1. MANIPULATION AND INTRODUCTION OF PLASTIC FILLING-MATERIALS. 335 operation, but if the metal in the mean time loses its fluidity and thusindicates the lowering of the temperature, it can be restored by hold-ing the heater for a moment over the flame until the metal again becomesfluid. Fig. Dr. Hows thermoscopic heater. When the metal disk is fused the pellets 1, 1, will be at a temperatureof about 212° F., while pellets at 2 would have a temperature of about 200°F., and those at 3 and 4 about 194° and 180° F. respectively. Disk B,which is made of fusible metal which melts at 230° F., is provided as asubstitute for disk A, which may be melted and poured out, and B used inits stead. In this manner the high heat gutta-percha and the lowergrades may be properly softened without the least degree of u heat-rottingof the material. Manipulation of Gutta-Percha.—Instruments which are suitable forfilling difficult and inaccessible cavities with gold are best adapted forpacking gutta-percha, for, as a rule, the cavities in which this materialis generally used are in difficult and inaccessible locations. In packingthis material it is best to use warm instruments, as it is important that thewhole mass of the filling be kept in a plastic state until perfect adaptationto the wa
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