Which block anesthetizes the posterior portion of the hard palate and tissues anterior to the first premolar?

• A. Greater palatine nerve block
• B. Nasopalatine nerve block
• C. Infraorbital nerve block
• D. Mental nerve block

Answer: (A)

The key idea is that palatal anesthesia depends on which nerve supplies the target area. The greater palatine nerve provides sensation to the posterior part of the hard palate and the palatal gingiva of the maxillary posterior teeth (molars through premolars), as it travels in the greater palatine canal and exits at the greater palatine foramen near the posterior hard palate. Blocking this nerve at its foramen effectively numbs the posterior hard palate and the tissues toward the back of the mouth, which includes the region around the first premolar area on the palate.

The other blocks target different regions: the nasopalatine nerve block numbs the anterior hard palate between the canine teeth; the infraorbital nerve block mainly affects the maxillary teeth on the buccal side and some facial soft tissues rather than the palatal mucosa; and the mental nerve block is for the lower lip and chin, not the palate.