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angles with the pulpal wall, and its margins should unite with the buccal
and lingua! margins on these surfaces (Fig. 59). The buccal and lin-
gual margins should extend occlusally in the form of a straight line
to the occlusal third and then they should extend laterally in the form
of a reverse curve to the axial walls of the cavity, uniting with the
occluso-axial margins of the cavity in the form of a curve (Fig. 60).
Fir.. r,i.
Fig. 62.
The walls of the cavity should slightly diverge from the pulpal wall in
both directions.
In cases of bucco-occlusal or approximo-occlusal cavities involv-
ing most of the crown of the tooth and extending beyond the gingival
line the cavity may be prepared as outlined in Fig. 61A. The posts
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