Abstract: Objective To investigate the application of digital guide plate in extraction of impacted supernumerary teeth in the lingual region of mandibular posterior region and evaluate its efficacy. Methods From January to November, 2020, 10 patients with bilateral impacted supernumerary teeth in the lingual region of bilateral mandibular posterior region treated in the department of oral and maxillofacial surgery, Affiliated Stomatological Hospital of Xuzhou Medical University were enrolled in this study. By self-contrast method, one side of 10 patients were treated with digital guide plate to remove the impacted supernumerary teeth (test group). The other side which was treated without using guide plate for operation served as the control group. The manufacture time, operation time, postoperative swelling and pain were compared between the two groups. Results The average time of operation was significantly shorter in the test group ((19.84±6.52) min) than in the control group ((31.03±9.68) min), and the degree of postoperative pain and swelling was significantly lower than the control group. Statistics showed that differences between the two groups were statistically significant (P<0.05). Conclusion The application of digital guide plate in extraction of impacted supernumerary teeth in the lingual region of the mandibular posterior region can significantly shorten operation time, reduce surgical complications and improve surgery quality, which has good application prospect.

Key words: digital guide plate, lingual region of the mandibular posterior region, supernumerary tooth, minimal invasion extraction