Abstract: Objective: To compare the effects of topical anesthesia combined with STA painless anesthesia, STA painless anesthesia, and traditional pressure syringe local anesthesia in the extraction of supernumerary teeth in children. Methods: Ninety children aged 5-14 years with supernumerary teeth in maxillary anterior teeth were randomly divided into three groups with 30 children in each group. Group A was topical anesthesia combined with STA painless anesthesia, group B was STA painless anesthesia, and group C was local anesthesia with traditional pressure syringe. All groups were treated with labial and palatal local infiltration anesthesia. The values of systolic blood pressure, diastolic blood pressure, heart rate, and blood oxygen saturation were recorded before and after injection. During the injection, the behavior of the children was scored by the modified behavior scale (MCHEOPS), and the degree of pain during anesthesia was evaluated according to the Wong-Baker facial expression scale at the end of treatment. Results: During palatal infiltration anesthesia, the degree of pain in group A and B was less than that in group C(P<0.05), but there was no significant difference between group A and group B(P>0.05). During buccal infiltration anesthesia, the degree of pain in group A was significantly alleviated (P<0.05). The self-pain evaluation of children showed that the pain value of children in group A was lower (P＜0.05). There was no significant difference in blood pressure, heart rate, and blood oxygen saturation in group A before, during, and after injection, but the blood pressure in group B and group C increased significantly after injection (P＜0.05). Conclusion: The application of topical anesthesia combined with STA painless anesthesia in the treatment of supernumerary tooth extraction in children can reduce the pain during injection.

Key words: STA painless anesthesia, topical anesthesia, pain