When performing maxillary infiltration, where should the needle tip be positioned?

The correct positioning of the needle tip above the area of the root apex during maxillary infiltration is crucial for effective anesthesia. This technique aims to deposit the local anesthetic in a way that it diffuses through the bone and into the area innervated by the specific nerve branches, typically the anterior superior alveolar and middle superior alveolar nerves.

By placing the needle tip above the root apex, it allows for the anesthetic to reach the target nerve more efficiently and ensures a broader area of anesthesia when needed, especially in cases involving multiple teeth or broader areas of soft tissue. This positioning helps to minimize the amount of anesthetic needed while maximizing the effectiveness of the procedure.

In contrast to other potential positions, placing the needle tip below the root apex may not adequately cover the area requiring anesthesia, risking inadequate pain control. Additionally, inserting the needle at a right angle or parallel to the opposing tooth may not allow for the optimal diffusion of the anesthetic into the surrounding tissues, further diminishing the effectiveness of the anesthesia. Thus, opting for positioning the needle tip above the area of the root apex is aligned with established practices for achieving successful maxillary infiltration.