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200 THE GOLD AND PORCELAIN INLAY

the model it should be chilled in cold water before removal
(see Figs. 250, 251, 252 and 253). In cases of badly broken
down teeth the obtaining of the wax pattern may often be

Fig. 250.—Wax models carved Fig. 251.—Wax model ready
and ready for removal. for insertion of sprue wire.

Fig. 252.—Wax model ready for Fig. 253.—Wax model ready
withdrawal. for insertion of sprue wire.

facilitated by the use of a matrix band encircling the tooth,
to hold the wax in position during its adaptation.

Construction of the Inlay

After the wax model is carved, chill it, heat and attach

the sprue wire, in a part of the wax affording sufficient bulk