What teeth are numbed by the posterior superior alveolar nerve block?

The posterior superior alveolar nerve block is specifically designed to anesthetize the maxillary molars, which includes the second and third molars and often the first molar as well. In this context, when referring to the teeth as #1, #2, and #3 (where #1 is the first molar, #2 is the second molar, and #3 is the third molar), the correct option indicates that the block affects the first and second molars, as well as the distal buccal root of the third molar.

The reason this is the correct answer lies in the anatomy of the posterior superior alveolar nerve, which provides sensory innervation to these specific areas. The nerve block is typically effective in targeting the roots of the second and third molar and often includes the distal buccal root of the third molar due to its proximity and shared nerve supply.

Understanding the nerve anatomy and the region affected by this specific injection technique is crucial in dental practice, as it allows for effective anesthesia for procedures performed on these teeth, ensuring patient comfort during treatment. In this case, the first and second molars, along with the distal portion of the third molar, are adequately covered by the anesthetic