What type of injection can best achieve hemostasis?

To achieve effective hemostasis during a dental procedure, the most appropriate choice is an infiltration injection. Infiltration involves the administration of local anesthetic directly into the tissue surrounding the area being treated. This technique allows the anesthetic to block the nerve endings and blood vessels in that specific area, which can significantly reduce bleeding.

The key mechanism behind infiltration's effectiveness for hemostasis is that when the anesthetic is injected into the tissues, it causes vasoconstriction in the local blood vessels. Many local anesthetics contain a vasoconstrictor, like epinephrine, which further decreases blood flow to the area and helps minimize bleeding during surgical procedures.

Understanding the context of the other options underscores why infiltration is superior in this instance. Nerve blocks provide pain relief by anesthetizing larger areas but may not be as effective in directly controlling bleeding in the treatment area. A field block, while also effective for anesthesia, typically surrounds a larger area and does not focus on individual capillaries and arterioles as effectively as infiltration. Intraligamentary injections are specialized for specific situations, generally for working in periodontal areas, and may not provide the same localized hemostatic control that a direct infiltration can offer.

Thus, infiltration