What is the primary purpose of applying gentle pressure to a patient's arm during local anesthetic injection?

The primary purpose of applying gentle pressure to a patient's arm during local anesthetic injection is to restrict sudden movement. This technique serves as a physical cue to the patient to remain still during the procedure, which is critical for achieving accurate placement of the anesthetic. It helps reduce the risk of complications, such as inadvertent injury to nerves or blood vessels, that may occur if the patient moves unexpectedly when the needle is inserted. Additionally, maintaining stillness allows the practitioner to deliver the local anesthetic safely and effectively, ensuring optimal results for the patient.

While ensuring comfort during the procedure, alleviating pain from the needle insertion, and enhancing blood flow to the area may have their individual benefits in the context of dental procedures, the primary focus of gentle pressure during injection is to minimize movement and promote safety.