In class 3 and class 5 cavity preparation retention grooves are given:
Correct Answer: Over dentinal wall.
Description: In class III class IV preparations the external walls diverge outwards to provide string enamel margins and therefore Retention Coves (on 3-point angles) or Retention grooves (on axio gingival line angle) are prepared in the dentinal walls to provide the retention form.
Category:
Dental
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