When performing local infiltration on the palatal side of tooth #13, where is the correct insertion point?

The correct answer for the insertion point when performing local infiltration on the palatal side of tooth #13 is at the apex of the root. This is because the aim of a local infiltration technique is to deposit anesthetic solution in close proximity to the nerves serving the specific area where anesthesia is needed. For palatal infiltrations, targeting the apex of the root allows the anesthetic to diffuse effectively to the nerve endings responsible for the sensation in that area.

By placing the needle at the apex, the practitioner can ensure that the anesthetic spreads around the root and prevents sensation in the appropriate soft tissues. This technique helps provide effective anesthesia for procedures involving tooth #13, which is the maxillary first molar.

The other options, while they may represent potential points of injection for other techniques, do not provide the same level of direct access to the target area for effective anesthesia in this particular case. For instance, the buccal vestibule and midline of the palate might not achieve effective anesthesia as they do not place the anesthetic near the root apex where the nerves terminate. Additionally, injecting at the distal of the tooth would not properly anesthetize the necessary tissue around tooth #13. Each of these alternatives may have their place depending on the clinical