Accuracy and Reliability of CBCT in Prediction of TMJ Disc Position

Abstract

nternal derangement (ID) is the most frequent cause of Temporomandibular joint disorders (TMD). It is described as an abnormal positional and functional relationship between the disc and articulating surfaces.1 Anterior disc displacement with reduction (ADDWR) is the prevalent intra-articular TMD representing 41% of TMD diagnoses.2 Additionally, ADDWR is discovered in up to 33% of asymptomatic individuals.3 ADDWR is characterized by the progressive displacement of the articular disc against the mandibular condyle, accompanied by pain, clicking sounds as the disk resumes its normal position on jaw opening and in some cases limitation of mandibular movement.4 Several studies suggested that changes in the condylar shape, condylar position and condylar dimensions are associated with ADDWR. It was reported that the normal condylar head has a convex configuration throughout and any changes in this configuration may be attributed to a change in the disc position.5 and that there is a higher prevalence of ADDWR in angled condyles. 6 Condyles in patients with ADDWR generally showed a more posterior position and an increased size of anterior joint space.7,8 Also, condylar dimensions may be significantly