Objective: To investigate the occurrence and radiographic signs of osteoarthrosis of the temporomandibular joints(TMJOA) with cone beam computed tomography(CBCT) in adolescents.Methods: Individuals with temporomandibular disorders(aged 10-19 years) in the patients group(n=386) and pre-orthodontic patients with malocclusion(aged 10-19 years) in the control group(n=339) were included in the present study.All the patients in both groups had been examined by CBCT.The abnormalities of the condyle were evaluated....