. The Dental cosmos . pped into liquidwax. The only way in which these sev-eral states of working plasticity can belearned is by close observation in actualwork in the mouth. It is certain, however, that variousstates of working plasticity in the soft-ened wax are essential; therefore the wax-softener should be so constructed that arange in temperature sufficient to meetall demands is readily obtainable; also,that melted—liquid—wax is available atall times or on short notice. Further-more, as a wax pattern should never besprayed with or subjected to cold water VAN HORN.—THE WAX PATTERN. 981 wh
. The Dental cosmos . pped into liquidwax. The only way in which these sev-eral states of working plasticity can belearned is by close observation in actualwork in the mouth. It is certain, however, that variousstates of working plasticity in the soft-ened wax are essential; therefore the wax-softener should be so constructed that arange in temperature sufficient to meetall demands is readily obtainable; also,that melted—liquid—wax is available atall times or on short notice. Further-more, as a wax pattern should never besprayed with or subjected to cold water VAN HORN.—THE WAX PATTERN. 981 which is hard-soldered in the center ofthe top a brass wire standard No. 9 gage,one inch long. Midway between the twofront screws in the top plate a hole isdrilled, and into it is fitted and hard-soldered a tube which projects downward;the standard of the wax enp fits looselyinto the tube, the bottom of the cupresting upon the top plate, the purposeof the tube being to prevent the wax cupfrom tipping over. Fig. Showing various parts of wax-softener. while in the tooth cavity, it would bean added advantage if our wax-softenerwould provide hoi water, when needed,for that purpose. THE WAX-SOFTENER. The wax-softener devised by the writerpossesses the three features just men-tioned; it is quite simple in construction,and verv easily operated. Description. The heat is derived fromthe electric current through a PeltonWater-heater Xo. 1 which has a rheo-stat giving four gradations of heat. Theremodeling, etc., is done as follows ; The circular opening in the top plate is2f inches in diameter; to the flange arehard-soldered, at the points of a triangle,three Xo. 14-gage brass wire lugs whichproject one-eighth of an inch into theopening. The water-glass is supportedby these three lugs, thus giving a radi-ating space of one-eighth of an inch be-tween the walls of the muffle and thewater-glass, the glass which is used—notthe one furnished with the heater—being3^ inches long by
Size: 2189px × 1141px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
