. A manual of mechanical dentistry and metallurgy . efully separated bypassing a knife-blade between them; a gentle movementwill cause one or the other to leave the plaster, when theremaining one is easily detached by a few blows from thehammer on its edge. Now trim off the plaster from aroundthe case, wash freely, cut away the surplus, and remove thetin-foil. The case is then ready for finishing, which is7 74 MECHANICAL DENTISTRY AND METALLURGY. accomplished with the use of the same instruments usedin rubber work. The final polish is given first with felt wheels and pumicestone, and afterward
. A manual of mechanical dentistry and metallurgy . efully separated bypassing a knife-blade between them; a gentle movementwill cause one or the other to leave the plaster, when theremaining one is easily detached by a few blows from thehammer on its edge. Now trim off the plaster from aroundthe case, wash freely, cut away the surplus, and remove thetin-foil. The case is then ready for finishing, which is7 74 MECHANICAL DENTISTRY AND METALLURGY. accomplished with the use of the same instruments usedin rubber work. The final polish is given first with felt wheels and pumicestone, and afterward with brush-wheels and chalk, takingcare not to use too much friction lest the plate should bewarped. Celluloid Combined With Other Bases.—The combina-tion of celluloid with other dental bases, such as rubber,gold, and aluminum, is deserving, by reason of its merits,of favorable consideration. In commenting on this methodProfessor Charles J. Essig very justly remarks: That weare able to produce an artificial denture embracing all that Fig. 42. J. is good in metallic and vulcanite work, at the same timeavoiding the great defects of each. The manipulation and details of constructing this classof dentures was first described by Dr. Hunt, of Indianapolis,Ind. It is as follows: Take the impression, make metallicdies, and form the plate as for work in the ordinary fitting the plate in the mouth, get the articulation,the fulness and length of the teeth, remove the wax andplate from the mouth, and make the plaster a full set, after separating the articulation, and beforeremoving the wax from the plate, take a small, light pairof dividers, set them say one inch apart, and with one pointfollowing the margin of the wax representing the cutting CELLULOID AS A DENTAL BASE. 75 edge of the teeth, and the other point marking permanentlythe plaster, you have always in the (li\-iders so set, a gaugefor the length of any particular tooth. A convenient sub-stitute for t
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