Objective   To investigate the imaging and condylar movements during mandibular opening/closing movement in AngleⅡ

2

malocclusion accompanying one side of temporomandibular joint (TMJ) click before and after orthodontic treatment.    Methods   There were 20 AngleⅡ

2

malocclusion patients with one side of TMJ click in treatment group

and 23 with the individual normal occlusion in control group. This study was performed taking the films of Schüller position before and after treatment

using CADIAX to record the condylar tracings during opening/closing movement and analyze the qualitative and quantitive changes

.    Results   In AngleⅡ

2

malocclusion patients

the condylar position of 58.33% patients recovered from retroposition to mesoposition. The condyle movement presented conspicuous verticality

the smoothing and symmetry were not well

and obvious improvements were observed after the treatment. All the index changed remarkably except the TCI and TCI of 5 mm.    Conclusion   It is suggested that orthodontic treatment can make the disc-condyle relationship return to normalization

and the condylar movement become much more coherent.