Which statement correctly describes the greater palatine canal approach to maxillary nerve block?

Which statement correctly describes the greater palatine canal approach to maxillary nerve block?

• A. Insert soft tissue directly over the GP foramen; deposit 1.8 mL over 1 minute; insert the needle 30 mm and aspirate in two planes; If resistance is felt, withdraw and advance at a different angle
• B. Inject near the GP foramen only
• C. Use a short needle of 5 mm
• D. Do not aspirate during injection and deposit 0.5 mL

Answer: (A)

The key idea is delivering anesthesia along the greater palatine canal to reach the maxillary nerve as it travels toward the pterygopalatine fossa. This requires a long needle and careful technique to place the anesthetic inside the canal rather than just near the foramen. The best way described is to start at the greater palatine foramen, insert a long needle about 30 mm to enter the canal, and deliver roughly 1.8 mL of anesthetic slowly over a minute. Before injecting, aspirate in two planes to check for intravascular placement. If you encounter resistance, withdraw slightly and adjust the angle to stay within the canal rather than pushing forward blindly. Other options don’t fit because injecting only near the foramen misses the canal route needed to block the maxillary nerve trunk; using a very short needle cannot reach the canal; and not aspirating with a small volume lacks safety and efficacy.

The key idea is delivering anesthesia along the greater palatine canal to reach the maxillary nerve as it travels toward the pterygopalatine fossa. This requires a long needle and careful technique to place the anesthetic inside the canal rather than just near the foramen.

The best way described is to start at the greater palatine foramen, insert a long needle about 30 mm to enter the canal, and deliver roughly 1.8 mL of anesthetic slowly over a minute. Before injecting, aspirate in two planes to check for intravascular placement. If you encounter resistance, withdraw slightly and adjust the angle to stay within the canal rather than pushing forward blindly.

Other options don’t fit because injecting only near the foramen misses the canal route needed to block the maxillary nerve trunk; using a very short needle cannot reach the canal; and not aspirating with a small volume lacks safety and efficacy.