Final answer:
The middle superior alveolar nerve is the nerve that is anesthetized to block all pain sensation for the maxillary molar teeth.
Step-by-step explanation:
The nerve that is anesthetized to block all pain sensation for the maxillary molar teeth is the middle superior alveolar nerve.
When performing a maxillary nerve block, the dentist would typically inject anesthesia in the area near the maxillary tuberosity, where the middle superior alveolar nerve is located. This blocks pain sensation for the maxillary molar teeth.