Dental In the cast restoration, cusp protection is mandatory when: A The lesion depth is ⅓ to ½ the intercuspal distance B The lesion depth exceeds ½ the intercuspal distance C The lesion width is ⅓ to ½ the intercuspal distance D The lesion width exceeds ½ the intercuspal distance 💡 Explanation In the cast restoration, cusp protection is mandatory when: ✓ Correct Answer: D. The lesion width exceeds ½ the intercuspal distance