INBDE (Integrated National Board Dental Examination) Practice Exam

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Where is the safety zone for avoiding perforation in mandibular molars?

Mesial side of mesial root
Distal side of mesial root
Buccal side of distal root
Lingual side of distal root

The correct answer is: Mesial side of mesial root

Generally, the most effective way to avoid perforation in mandibular molars is to stay on the mesial side of the mesial root. This is because the mesial root is usually longer and has a thicker bone support, making it less likely to perforate compared to the distal root. Additionally, the mesial root is usually more accessible and has a greater distance from the inferior alveolar nerve, which reduces the risk of nerve injury. The other options, such as the distal side of the mesial root, buccal side of the distal root, and lingual side of the distal root, are incorrect because they increase the likelihood of perforation due to thinner bone support and closer proximity to the inferior alveolar nerve. Therefore, staying on the mesial side of the mesial root is the safest approach to avoid perforation in mandibular molars.