Dental Occlusal isthmus of a M.O. dental amalgam is resistant to fracture if: A Pulpal floor depth is 1mm B Dove tail is present C Axiopulpal line angle is rounded D Unsupported enamel at the gingival cavosurface margin is planed 💡 Explanation Occlusal isthmus of a M.O. dental amalgam is resistant to fracture if: ✓ Correct Answer: C. Axiopulpal line angle is rounded