Objective    To discuss the characteristic of condylar movement of adolescent AngleⅡ

1

malocclusion with mandibular retrusion.     Methods    The sample included normal group and experimental group (25 subjects in each group). Condylar movement was recorded during mandibular movement with Computer Aided Diagnosis Axiograph (CADIAX).     Results    During open/close movement

the distance of condylar movement was smaller than that of the normal subjects. During protrusion/retrusion movement

protruded extension increased. During lateral excursion

the sagittal inclination of the non-working side condylar movement trace was larger than the protrusion movement trace. When the distance

of condylar movement was 5 mm

the sagittal condylar inclination was bigger than that of the normal subjects.     Conclusion    Condylar movement trace of experimental group is significantly different from that of the normal group

maybe correlating to condylar position

overbite and overjet.