Abstract: Objective: To investigate the application value of tooth-supported digital guide plate in genioplasty. Methods: Seven patients with chin deformities at the Department of Oral and Maxillofacial Surgery of Affiliated Stomatological Hospital of Kunming Medical University were selected from March 2017 to March 2018. Three-dimensional imaging measurements were made by establishing a digital model to accurately determine the degree of malformation of the chin in the three-dimensional space. The doctors were given simulated design before surgery, virtual osteotomy, and design and 3D printed tooth supported osteotomy guide plate for surgery. Three months after surgery, CBCT was taken and the surgical design was matched to evaluate the accuracy of the guide plate. Results: The patients were all primary healed and satisfied with the effect after the operation. The matched data showed that the average error between postoperative CBCT and preoperative virtual surgery was 0.7335mm. Conclusion: The use of digital technology for 3D reconstruction and surgical simulation, and 3D printed tooth supported guide could improve operation accuracy and the variety of chin deformities were effectively improved, thus it has practical application value.

Key words: Genioplasty, Virtual surgery, Digital guide