National Dental Examining Board of Canada (NDEB) Practice Exam

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Which root surfaces have concavities that make scaling and root planing difficult?

  1. Distal of max molars and mand molar

  2. Buccal of max incisors and lingual of mand incisors

  3. Mesial of max first premolars and mesial of mand incisors

  4. Lingual of max molars and buccal of mand molars

The correct answer is: Mesial of max first premolars and mesial of mand incisors

The mesial surfaces of the maxillary first premolars and mandibular incisors have concavities that make scaling and root planing difficult. Both the mesial surfaces of maxillary first premolars and mandibular incisors have deep concavities known as the mesial concavities. This makes it challenging to access and clean these areas thoroughly during scaling and root planing. The other options do not have specific concavities that pose difficulties during scaling and root planing, making them incorrect answers.

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