Oral injection of superior posterior alveolar nerve block anesthesia and its precautions

Insertion point: The insertion direction of the distal buccal groove of the maxillary first molars: the insertion depth is about 1-2 cm, and the needle is rotated outwardly to make the needle go around the anterior alveolar ridge along the bone surface, and the anesthetic is injected behind it. The main attention should be paid to this rotation to avoid direct backward and upward entry of the needle into the pterygous plexus, resulting in hemorrhage and hematoma. The anesthetic effect is also not good.

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