Abstract: Objective: To investigate the relationship between methods of extract tooth and TMD. Methods: 160 individual were randomly chosed. Minimally invasive and traditional extract tooth methods were used respectively to extract impacted tooth of third molar of mandibular. Dual-axis diagnosis standard was used to analyse the symptom of TMD after operation of extract the tooth in pre-operation, post-operation 1, 4, 24 weeks. Results: The group of minimally invasive morbidity of temporomandibular joint click was significantly lower than the traditional extract tooth methods group, and this difference was statistically significant. Conclusion: Minimally invasive extract tooth methods can reduce the complication of TMD.

Key words: Temporomadibular joint disorders , Minimally invasive extract tooth , Dual-axis diagnosis