Infiltration anesthesia is a method of injecting local anesthetic into surgical site, subcutaneous tissue, mucosa and deep tissue to anesthetize sensory nerve endings or nerve trunks, so as to make them lose the ability of sensory and conduction stimulation.

A, soft tissue infiltration anesthesia

1, indications: extensive oral and maxillofacial surgery.

2. Methods: A small amount of local anesthetic solution was injected into the skin and mucosa for small elevation, and then injected into the tissue of the operation area from shallow to deep along the incision line, and the local anesthetic solution diffused and penetrated into the nerve endings, achieving good anesthetic effect. At the same time, it is convenient to stop bleeding and share tissues.

Second, periosteal infiltration method

1. Indications: operation of maxillary teeth, mandibular anterior teeth and alveolar cleft.

2. Methods: Insert the needle into the labial buccal vestibular sulcus of the teeth to be anesthetized. When the angle of the needle tip touches the bone surface, the needle should be withdrawn about 0.2cm, and then 0.5-2ml anesthetic should be injected.

Third, periodontal ligament injection method

1, indication: it is suitable for hemophilia and similar bleeding tendency patients; When the analgesic effect of infiltration anesthesia or block anesthesia is insufficient, periodontal wax injection can often achieve better analgesic effect.

2. Methods: A short and thin needle was used to penetrate the periodontal ligament about 0.5cm deep from the mesial or distal surface of the tooth, and 0.2ml local anesthetic was injected respectively.

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