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Oral Surgery · single question

To extract the upper right third molar (#1), which nerve blocks must be given?

  1. Anterior superior alveolar (ASA) + nasopalatine
  2. Posterior superior alveolar (PSA) + greater palatine
  3. Middle superior alveolar (MSA) + lesser palatine
  4. Infraorbital + nasopalatine
Show answer and explanation

Correct answer: B. Posterior superior alveolar (PSA) + greater palatine

For upper molar (third molar) extraction: (1) PSA nerve — supplies pulp, buccal root, and buccal gingiva of maxillary molars; (2) Greater palatine nerve — supplies palatal gingiva of posterior maxilla (premolars and molars). Both blocks are required for complete anesthesia of the upper third molar.
  • A. ❌ ASA supplies upper incisors and canine; nasopalatine supplies anterior palate — not for molars.
  • B. ✅ PSA + greater palatine — the correct combination for upper molar anesthesia including third molars.
  • C. ❌ MSA supplies premolars; lesser palatine supplies the soft palate — not for third molars.
  • D. ❌ Infraorbital supplies anterior teeth and premolars — not the correct block for molars.

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