A practical treatise on mechanical dentistry . Fig. —S CAST METAL BASE. 371 All is now ready for drying. This is done in an oven speciallyprepared for the purpose, but it may be accomplished in any wayto be chosen by the manipulator. An ice-cold mouth mirrorplaced over the opening of the pouring-gain will detect theslightest moisture which may remain, and until this is entirelydispelled the casting should not be attempted. There are several grades of the gold alloy, as compounded byDr. Reese, to melt which require a heat registering from 6oo° to7000 F., but a higher temperature than this
A practical treatise on mechanical dentistry . Fig. —S CAST METAL BASE. 371 All is now ready for drying. This is done in an oven speciallyprepared for the purpose, but it may be accomplished in any wayto be chosen by the manipulator. An ice-cold mouth mirrorplaced over the opening of the pouring-gain will detect theslightest moisture which may remain, and until this is entirelydispelled the casting should not be attempted. There are several grades of the gold alloy, as compounded byDr. Reese, to melt which require a heat registering from 6oo° to7000 F., but a higher temperature than this must be attained beforepouring, in order to secure a satisfactory flow. At 9000 rapid oxida-tion takes place. This, of course, should be avoided. The alloymay be melted in an ordinary iron ladle or crucible, over a gas orother flame, and should be poured while the mold is hot. Fig. 164.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
