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

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.