For palatal infiltration, what is the relationship of the needle tip to bone?

• A. On the bone
• B. In the soft tissue away from bone
• C. In the nasal cavity
• D. In the pterygopalatine fossa

Answer: (A)

In palatal infiltration, the needle tip should rest against the palatal bone. This bone contact places the anesthetic right at the periosteum where the palatal nerves—the branches that supply the hard palate—are located, so diffusion of the solution into the nerve fibers is most reliable. The palate’s mucosa is tightly bound to bone, and achieving anesthesia by depositing near the bone helps ensure the solution remains in the correct tissue plane and reaches the targeted nerves. If you stay in soft tissue away from bone, diffusion can be unpredictable, onset may be slower, and anesthesia can be incomplete. Deeply penetrating toward areas like the nasal cavity or the pterygopalatine fossa is not appropriate for standard palatal infiltration and increases risk of complications.