Oral Surgery · single question
To anesthetize tooth #2 (upper right third molar), which nerve block is used?
Show answer and explanation
Correct answer: A. Posterior Superior Alveolar (PSA) nerve block
✓ A) PSA (Posterior Superior Alveolar) nerve block is correct.
The PSA nerve innervates: maxillary molars (#1, 2, 3, 14, 15, 16) — except the mesiobuccal root of #3 and #14 (which may be innervated by the MSA nerve in ~28% of patients). For tooth #2 (upper right third molar), the PSA nerve block is the primary anesthetic technique. The injection is made posterior to the maxillary tuberosity at a 45° angle upward, inward, and backward. This provides pulpal and periodontal anesthesia for the maxillary third and second molars.
The PSA nerve innervates: maxillary molars (#1, 2, 3, 14, 15, 16) — except the mesiobuccal root of #3 and #14 (which may be innervated by the MSA nerve in ~28% of patients). For tooth #2 (upper right third molar), the PSA nerve block is the primary anesthetic technique. The injection is made posterior to the maxillary tuberosity at a 45° angle upward, inward, and backward. This provides pulpal and periodontal anesthesia for the maxillary third and second molars.