What type of pressure mechanism is responsible for producing anesthesia during intrapulpal injection?

Intrapulpal anesthesia works through the mechanism of back pressure — the anesthetic solution is injected directly into the pulp chamber under significant resistance (approximately 170 psi), with the needle fitting snugly in a small exposure or canal orifice to prevent backflow. The back pressure generated within the confined pulp space causes immediate anesthesia, likely through direct nerve fiber compression and chemical blockade of sodium channels. Simply depositing anesthetic passively into the pulp chamber is insufficient; the solution must be delivered under back pressure. This technique is reserved for 'hot teeth' that fail to respond to conventional anesthetic techniques.