Dental Hygiene Local Anesthesia Practice Test

The key idea is using a targeted injection that numbs a specific tooth by delivering anesthetic into the tooth’s supporting structures. For the maxillary incisors, anesthetic is commonly deposited through the interdental papilla into the periodontal ligament space (a periodontal ligament or intraligamentary injection). Inserting the needle through the papilla and into the PDL around the incisor roots numbs the maxillary incisors effectively with a small volume of anesthetic.

Injecting into the palate would numb palatal tissues, not primarily the teeth. Injecting into the buccal mucosa can anesthetize the surrounding soft tissue but isn’t as directly targeted to the tooth itself as the PDL approach via the papilla. The inferior alveolar canal is a lower-jaw structure and not involved in numbing the upper front teeth.