Principles and practice of operative dentistry . years there has been a demand upon the part of some operatorsfor harder grades of gutta-percha, which require a degree of heat for theirsoftening greater than can be obtained by boiling water. The therrnoscopicheater of Dr. W. Storer How,* shown in Fig. 463, meets these require-ments in a most perfect and scientific manner. The heater is composed ofa block of steatite, selected for its heat-retaining qualities and the desira-bility of its surface. At one end is a wooden handle, at the other end acircular recess, in the centre of which is a small
Principles and practice of operative dentistry . years there has been a demand upon the part of some operatorsfor harder grades of gutta-percha, which require a degree of heat for theirsoftening greater than can be obtained by boiling water. The therrnoscopicheater of Dr. W. Storer How,* shown in Fig. 463, meets these require-ments in a most perfect and scientific manner. The heater is composed ofa block of steatite, selected for its heat-retaining qualities and the desira-bility of its surface. At one end is a wooden handle, at the other end acircular recess, in the centre of which is a small disk, A, made of fusiblemetal which melts at 212° F. On the heater within the circular recess areplaced a suitable number of gutta-percha pellets, as 1, 1, and the heateris held over the flame of a spirit-lamp or Bunsen burner until the diskof fusible metal is melted, when the gutta-percha will be sufficientlysoftened for introduction into the cavity. The heater will maintainthe proper temperature long enough for the completion of an ordinary. 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. 463.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
