Abstract: Objective: To analyze the occlusal features of temporomandibular disorders (TMD) patients with Angle class II division 1 malocclusion, and explore the correlation between occlusal interferences and temporomandibular disorders. Methods: 60 Angle class II division1 malocclusion patients with TMD were selected as experimental group,60 Angle class II division1 malocclusion patients without TMD were set as control group. The degree of oral and facial discomfort was evaluated by visual analog scale. Temporomandibular dysfunction index was calculated to compare the symptoms between TMD patients with OI and without OI. Temporomandibular dysfunction index(dysfunction index, DI) includes mandibular movement(mandibular movement, MM),joint noise(joint noise, JN), and joint palpation (joint palpation, JP). Results: There were 45 occlusal interferences patients in experimental group and 42 occlusal interferences patients in control group (P＞0.05). In experimental group, the dysfunction index and the visual analog scale score of TMD patients with occlusal interferences was higher than those of TMD patients without occlusal interferences(P<0.01). The dysfunction index of female patients was higher than that of male patients. Conclusion: There was no direct connection between occlusal interferences and TMD,but TMD patients together with occlusal interferences could aggravate the patients’ symptoms. The existence of occlusal interferences could be a threat to the health of stomatognathic system.

Key words: occlusal interferences, temporomandibular disorders, temporomandibular dysfunction index, CR-MI discrepancy