Purpose: To investigate the characteristics of condylography of masticatory movement in patients of Class Ⅱ division 1 malocclusion with temporomandibular disorders (TMD), and the effects of TMD and Angle Ⅱ1 malocclusion factors on the condylography of masticatory movement.
Methods: According to the inclusion criteria of the experiment, ten normal occlusion subjects without TMD（nTMD-N）, ten Angle Ⅱ1 patients without TMD（nTMD-Ⅱ1）and 14 Angle Ⅱ1 patients with TMD（TMD-Ⅱ1）were included. Cadiax IV was used to record the condylography of the subjects during mastication, and the data of condylography was measured and analyzed by GDSW software. The results were analyzed with SPSS 26.0 software package.
Results: The characteristics of condylography in nTMD-Ⅱ1 and TMD-Ⅱ1 groups were different from those of nTMD-N group. During unilateral mastication on the left or right side, there was no significant difference among nTMD-N group, nTMD-Ⅱ1 group and TMD-Ⅱ1 group. During bilateral mastication, the SCI value of nTMD-Ⅱ1 group was significantly higher than that of nTMD-N group, and the S value of nTMD-N group was significantly higher than that of nTMD-Ⅱ1 group (P<0.05).
Conclusions: During unilateral masticatory movement, TMD and Angle Ⅱ1 malocclusion has little effect on the masticatory movement trajectory. Angle Ⅱ1 malocclusion has influence on bilateral masticatory movement, and the amplitude of condylar movement in patients with ClassⅡdivision 1 malocclusion is smaller than that in normal mastication. TMD has no significant effect on the masticatory movement condylography of the patients.