A. Buccal and lingual surfaces
B. Pits
C. Cusp tips
D. Marginal ridges
The correct answer is C. Cusp tips.
Gross occlusal reduction should be done on any decayed or filled posterior tooth undergoing root canal therapy.
This reduction should be done before rubber dam placement to check occlusal clearance in all excursive movements. It should be done before the first endodontic treatment, rather than after, in order not to disturb cuspal reference points used to establish proper length of the tooth.
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