Evaluation of bilateral temporomandibular joints coordination by means of simultaneous pseudodynamic MR imaging and SGG

• Published in: Nihon Gaku Koukou Kinou Gakkai zasshi Vol. 1; no. 1; pp. 195 - 202
• Main Authors: Chiba, Masayuki, Mushimoto, Eiko, Nakasato, Tatsuhiko, Tanabe, Tadaki, Tanaka, Hisatoshi, Tamakawa, Yoshiharu
• Format: Journal Article
• Language: Japanese
• Published: Japanese Society of Stomatognathic Function 1994
• Subjects: Articular disc movement; Condylar movement; MR imaging; Quantitative method; Sirognathograph
• ISSN: 1340-9085; 1883-986X
• DOI: 10.7144/sgf.1.195

The purpose of this study was to establish the functional diagnostic parameters of the temporomandibular joint in both dentulous and edentulous patients, by comparing the threedimensional mandibular movement of the lower incisal point to the condylar movement and articular disc movement using simultaneous pseudodynamic MR imaging of the temporomandibular joint. In addition, the quantitative evaluation method of the mandibular movement was employed. As a result, these methods were useful in understanding the three characteristic movements of the TMJ. These include the coordination of the bilateral condylar movement, the coordination of the condylar and articular disc movement, and finally, in the case of reduction of the anteriorly-displaced articular disc. Of particular note, according to analysis from the view point of the coronal plane, was a tendency toward lateral deviation of the lower incisal mandibular movement. This deviation was related to the lack of coordination of movement between the bilateral articular disc and the condylar, which is so characteristic of CMD patients. Prior to this research, functional diagnosis of the temporomandibular joint movement in edentulous patients had been difficult. This method may thus prove to be a first step in effective analysis of such conditions.