PSA// POSTERIOR SUPERIOR ALVEOLAR NERVE BLOCK// Oral surgery// Nerve blocks// Maxillary block/dental

The posterior superior alveolar nerve (PSAN) block is a dental nerve block used for profound anesthesia of the maxillary molars.
Insertion site: Height of the mucobuccal fold distal to the zygomatic process and superior to apex of the maxillary second molar. Angulations: Outward laterally at 45-degree angle from the midsagittal plane and downward 45-degree angle from the occlusal plane.
When the PSA is combined with the anterior middle superior alveolar (AMSA) block, the entire hemimaxilla may be anesthetized (including palatal tissues).