How much anesthetic is typically used for a PSA nerve block?

The optimal volume of anesthetic for a PSA (Posterior Superior Alveolar) nerve block typically falls within the range of 0.9 to 1.8 ml. This volume allows for effective diffusion of the anesthetic agent to adequately anesthetize the maxillary molars and associated structures without overwhelming the area. Using this amount generally achieves the desired level of anesthesia while minimizing potential complications or adverse effects related to higher volumes of anesthetic.

When the volume is aligned with this range, it balances efficacy and safety, ensuring that sufficient anesthetic is present at the target nerve while also reducing the risk of systemic absorption or localized complications such as hematoma. Adjusting the volume within this range can also account for variations in patient anatomy and individual needs.