Characteristics of condylar joint space, position and morphology in skeletal class II malocclusion patients with bilateral idiopathic condyle resorption

OBJECTIVE: To investigate the condylar joint space, position and morphology in skeletal Class II malocclusion patients with idiopathic condylar resorption (ICR), in order to provide reference for the clinical treatment and efficacy evaluation of ICR. MATERIALS AND METHODS: Skeletal Class II malocclusion patients with ICR and skeletal Class II malocclusion patients with normal temporomandibular joint (TMJ) structure were included in this study. The anterior joint space (AJS), superior joint space (SJS) and posterior joint space (PJS) were measured by computed tomography (CT) and magnetic resonance imaging (MRI). The surface area and volume of condyle were measured through three-dimensional reconstruction using CT scans. RESULTS: A total of 55 patients were included in both groups. All ICR patients exhibited bilateral anterior disc displacement without reduction (ADDWOR), with MRI revealing morphological changes in 90.91% of ICR patients. SJS in ICR group significantly decreased by 15.85% on CT and 14.23% on MRI (P