1737 Condylar movement analysis in normal subjects, using an amorphous sensor
H. IOI1, A.L. COUNTS2, and R.S. NANDA2, 1Kyushu University, Fukuoka, Japan, 2University of Oklahoma, College of Dentistry, Oklahoma City, USA

The purpose of this study was to determine the range of condylar movements in normal subjects by the use of an amorphous sensor. The pair-matched sample consisted of 17 Caucasian males (aged 25.8 2.5 years) and 17 Caucasian females (aged 25.5 2.8 years) who had no subjective or objective symptoms related to temporomandibular joint sounds. Bilateral condylar and jaw movements were recorded. Correlation coefficients (r) were calculated between any two measurements of condylar movement parameters. The results showed that the typical condylar movement points plotted on the X-Y co-ordinates indicated a uniform or approximately straight line, that is X=Y. The mean standard deviation (SD) for the maximum velocity of condylar movement during the opening and closing phases was 32.6 16.9 and 39.8 21.5 mm/sec, respectively. The mean SD for the degree of jaw opening at the turning point of condylar movement was 36.9 21.7%. Significant correlations existed between any two measurements of maximum velocity of condylar movement (r=0.36 to 0.80). Significant correlations existed between the left and right sides in the degree of jaw opening at the turning point of condylar movement (r=0.71). These results suggest that a range of normal values of condylar movements can be developed by utilizing the amorphous sensor.

Seq #166 - TMJ - Structure and Function I
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