Shanghai Journal of Stomatology ›› 2016, Vol. 25 ›› Issue (6): 738-743.

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Study of condyle movement in Angle Class Ⅲ malocclusion with temporomandibular dysfunctions

CHANG Zhong -fu1, CHEN Jie2   

  1. 1.Department of Stomatology, People's Hospital of Shanghai Pudong District. Shanghai 201299;
    2.Department of Orthodntics, Affiliated Hospital of Qingdao University. Qingdao 266011, Shangdong Province, China
  • Received:2016-06-21 Online:2016-12-25 Published:2016-12-29

Abstract: PURPOSE: Subjects with normal occlusion, Angle Class Ⅲ malocclusion and Angle Class Ⅲ malocclusion with temporomandibular dysfunctions(TMD) were included, and their protraction and retraction, opening and closing mouth were recorded and compared to determine the condyle movement characteristics of Angle Class Ⅲ malocclusion patients with TMD. METHODS: Thirty cases of Angle Class Ⅲ malocclusion with TMD (experimental group), 30 cases of simple Angle Class Ⅲ malocclusion (control group 1) and 30 cases of normal occlusion (control group 2) were chosen, the condyle movement of mouth opening and closing, protraction and retraction were recorded and analyzed by computer aided axiography (CADIAX Ⅲ) , the measurements were compared and qualitative analysis was performed. SPSS 10.0 software package was used for statistical analysis. RESULTS: The indexes of opening and closing mouth, forward, backward and lateral movement were higher in experimental group and control group 1 than in the control group 2, especially in the vertical direction. The maximum variation was on the Y axis between the experimental group and the control group 2, the lateral movement of working side was significantly higher than that of the normal group, while the movement ranges at other directions were significantly smaller than that of control group 2, especially in opening and closing mouth horizontally upward and the maximum space displacement at right, upward direction (P<0.01). CONCLUSIONS: The tracking of condyle movements has its own characteristics in three dimensions in the experimental group ,compared with control group 1 and 2.

Key words: Temporomandibular dysfunctions, Angle Class Ⅲ, malocclusion, Normal occlusion, Permanent teeth, Condyle movement

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