Question 26 of 35

Sorry, that is not correct.

The answer is that the needle was inserted too deep. In this situation, solution was injected into the parotid gland where terminal portions of the facial nerve extend. This resulted in the facial nerve paralysis.

For an IAN injection, the appropriate depth of penetration is 2/3 to 3/4 the length of a long needle, which is approximately 20 - 25 mm. In this case, the clinician penetrated almost to the hub, thus creating this complication.