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eapiiks Tnvolt^ing m Tncisal Edge.
Simple cavities in the incisal edges of the anterior teeth are usually
caused by malformation. The mesial and distal walls of the cavities
should extend gingivally from two to four millimeters, and should
slightly diverge toward the incisal edge (Fig. 42). They may be slightly

Fig. 44.

Fig. 45.
grooved between their plates of enamel to resist the lingual stress (Fig.
43). The seat should be flat and should be grooved between the labial and
lingual walls.
Another form of cavity preparation for this class of cavities is as
follows : Prepare the labial outline as in Fig. 42. The lingual wall should
be cut farther in every direction, forming a step (Fig. 44). Two shallow

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