INBDE (Integrated National Board Dental Examination) Practice Exam

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Where is the danger zone for perforation risk in mandibular molars?

Mesial side of mesial root

Distal side of mesial root

When performing root canal treatment on mandibular molars, it is important to be aware of the potential perforation risk, which can occur when the instrument used to clean out the tooth's canals breaks through the thin walls of the root. The danger zone for this risk lies on the distal side of the mesial root, as it has thinner walls compared to the buccal or lingual sides. Therefore, options A, C, and D are incorrect as they do not accurately identify the location of the danger zone.

Buccal side of distal root

Lingual side of distal root

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