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196 THE GOLD AND PORCELAIN INLAY

metal pins on gingival, incisal or pulpal walls of vital teeth
(Figs. 234, 235, 236 and 237) or of i6-to 14-gauge pins of the

same material, inserted into the canals of pulpless teeth

Fig. 237.—Labial view Fig. 238.—Cavity prepared
of the cavity seen in Fig. for insertion of a pin inlay in
236. a pulpless cuspid tooth.

Fig. 239.—Extensive prepara- Fig. 240.—Another view of the cav
tion for a pin inlay in a pulpless ity shown in Fig. 239.
bicuspid. The lingual cusp is to
be restored with gold.

(Figs. 238, 239 and 240); deepening of the point angles is also
considered admissible, the cutting being done entirely at the

expense of gingival or pulpal walls, with the result that the

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