Science Links Japan | The Position of the Condyle and the Disc in Temporomandibular Joint Dysfunction; Comparison between Tomography and Magnetic Resonance Imaging.

The Position of the Condyle and the Disc in Temporomandibular Joint Dysfunction; Comparison between Tomography and Magnetic Resonance Imaging.

Accession number;99A0465491

Title;The Position of the Condyle and the Disc in Temporomandibular Joint Dysfunction; Comparison between Tomography and Magnetic Resonance Imaging.

Author; MAEDA NAOKI (Univ. of Tokushima, Sch. of Dent.) KAWAGUCHI SHIN'ICHI (Univ. of Tokushima, Sch. of Dent.) KUDO TAKAHARU (Univ. of Tokushima, Sch. of Dent.) HOSOKI HIDEHIKO (Univ. of Tokushima, Sch. of Dent.) UEMURA SHUZABURO (Univ. of Tokushima, Sch. of Dent.)

Journal Title;Dental Radiology

Journal Code:Z0608B

ISSN:0389-9705

VOL.39;NO.1;PAGE.1-7(1999)

Figure&Table&Reference;FIG.5, TBL.1, REF.28

Pub. Country;Japan

Language;Japanese

Abstract;To evaluate the position of the condylar head in the glenoid fossa (condylar position) in the intercuspal position, various methods have been employed. However, no standard evaluation method has been established. In addition, the correlation between the condylar position and TMJ internal derangement has not been elucidated. We designed a new, simple evaluation method for the condylar position. Furthermore, the correlation between the condylar position and articular disc displacement was examined. Subjects: A total of 160 TMJs of 80 TMD patients examined by tomography and MRI were included in this study. METHODS: Tomography was used to evaluate the condylar position in the antero-posterior and supero-inferior directions using our evaluation method as follows; (1) Three segments, the anterior (=a), posterior (=b) and superior (=c) joint spaces as shown by tomography were measured. (2) To evaluate the condylar position, 3 acquired values were substituted for 2 numerical expressions. Each antero-posterior and supero-inferior condylar position was expressed in APR and SIR quantitatively. APR=b-a/b+a*100, SIR=(a+b/2-c/a+b/2+c)*100. Articular disc positions were evaluated in 3 positions by MRI. The 3 positions were as follows; superior disc position: the articular disc was in the normal position, slightly anterior disc position: a part of the posterior band of the articular disc was between the articular eminence and condylar head, completely anterior disc position: complete anterior displacement of the articular disc. The differences among the condylar position of the TMJs of the 3 positions were statistically examined. RESULTS: A total of 157 TMJs were quantitatively evaluated in 2 directions. Three TMJs could not be evaluated with this evaluation method.... (author abst.)

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