Abstract: Objective　To investigate the clinical application significance of mandibular positioning template and connecting template manufactured by three-dimensional printing technique in mandibular reconstruction. Methods Six patients requiring a mandibular reconstruction were included in the study. The mandible was reconstructed and guided by the positioning template and connecting template, which were manufactured by three-dimensional printing technique before surgery. The patient's CT data were collected for 3D image reconstruction to establish an individualized three-dimensional coordinate system, and the preoperative and postoperative three-dimensional coordinate data of the relevant mandibular landmarks were measured for comparison to analyze the condylar displacement. All the patients were followed up regularly to evaluate its clinical application value. Results After the follow-up, all patients had satisfactory facial appearance, normal mouth opening, correct functional occlusal relations, and no TMJ symptoms were observed. In each three-dimensional direction, the maximum mean value of displacement was 1.08 mm, which was the movement of the right mandibular condyle in the left-right direction. The maximum standard deviation was 0.82, and the maximum standard error was 0.33, which was clinically acceptable. Conclusion Mandibular positioning template and connecting template can restore the correct spatial position of the condyles and preserve the original dimensions of the reconstructed mandible, which makes the condyle return to normal state, and greatly improves the accuracy and aesthetics of mandibular reconstruction.

Key words: three-dimensional printing technique, mandibular reconstruction, surgery, template