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grooves may be made between the plates of enamel, extending from the
seat of the cavity toward the incisal edge in such a manner that they
slightly diverge.
Cavities involving the entire incisal edge are very rare (Fig. 45 ). The
inlay must be retained by pins and by a step. Figs. 46 and 47 show a form

Fig. 46.

Fig. 47. Fig. 48.

of preparation for retaining the inlay by pins. The tooth should be
ground until sound structure well suported by dentin is reached, then
a V-shaped groove should be cut in a mesio-distal direction across the
tooth. The edges of this groove should be so formed that the cavity
bevels toward the center, the bevel being at about right angles to the curve

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