What type of injection technique involves depositing anesthetic close to a main nerve trunk?

The technique that involves depositing anesthetic close to a main nerve trunk is known as a nerve block. This method is specifically designed to anesthetize a larger area of tissue by targeting the main nerve that supplies sensation to that region. When the anesthetic is injected near the nerve trunk, it effectively interrupts the transmission of pain signals from that entire area, providing significant pain relief for various dental procedures.

In contrast, local infiltration refers to the administration of anesthetic directly into the tissue where the procedure is to be performed, which limits the numbing effect to a smaller area. Field block is similar but focuses on a group of local nerves rather than a single main nerve trunk. Nitrous oxide administration does not involve an injection technique but rather the inhalation of a gas to provide sedation and alleviate anxiety during dental procedures. Thus, the nerve block technique stands out as the correct choice for its specific approach to pain management by utilizing a main nerve trunk.