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THE GOLD INLAY 197

wax of the model may be forced into them and, being with-
drawn, will form small spurs on the inlay, producing the

Fig. 241.—An excellent Fig. 242.—An M. O. D. cavity
preparation for an inlay on the on a bicuspid.
proximal surface of a central
incisor involving the angle.

Fig. 243.—M. 0. D. cavity on Fig. 244.—A badly broken down
a bicuspid. Much more exten- molar. It has been necessary to re-
sive involvement of the cusps. move the disto-lingual cusp for rea-
The entire occlusal surface will sons of strength.
be restored with gold.

same result as if pins had been used. Extra retention may

also be accomplished, if desired, by temporarily filling in
undercuts in the cavity with wax of a different color from