The condylar movements in patients with TMD Discrimination analysis for condylar translation and rotation among different diagnostic groups

• Published in: Journal of the Japanese Society for the Temporomandibular Joint Vol. 10; no. 2; pp. 438 - 451
• Main Authors: NAGATA, Kazuhiro, OHNUKI, Keisuke, FUMA, Atushi
• Format: Journal Article
• Language: Japanese
• Published: The Japanese Society for Temporomandibular Joint 20.09.1998; 一般社団法人 日本顎関節学会
• Subjects: condylar movement analysis; mandibular movement disorders; 下顎頭運動解析; 顎運動障害
• ISSN: 0915-3004; 1884-4308
• DOI: 10.11246/gakukansetsu1989.10.438

It was suggested that mandibular movement disorder is closely related to the TMJ of masticatory muscle in TMD patients. However, this relationship has not been confirmed. The purpose of this study was to quantitatively evaluate the mandibular movement in TMD patients in order to elucidate the relationship between abnormalities of the TMJ or masticatory muscle and mandibular movement disorder. A total of 103 joints, consisting of 94 TMD joints as subjects and 9 normal joints as controls, was selected. The maximum translation and rotation of condylar movements was measured using the apparatus developed by Nagata et al. The subjects were divided into 6 subgroups, and each volume of maximum movement was statistically compared among the groups employing the discrimination analysis. The conclusions were as follows:. A marked limitation of movement was observed in the groups with abnormal TMJ. 77% of anterior disk displacement with reduction (ADD/wr), 16% of anterior disk displacement without reduction (ADD/wor), and 50% of osteoarthrosis were within normal limits in the movement volume, some of which involved an abnormal TMJ without limitation of movement. There were no significant differences in ADD/wr in comparison with the normal group. Both translation and rotation movements tended to reduce in ADD/wor compared to the normal group. There was no relationship between PD and hypermobility of TMJ. From the results, it was suggested that limitation of condylar movement related to TMJ disorders, and each disorder has a different feature of limitation.