Abstract
Recently Muscle Balance Monitor (MBM) has been introduced commercially, This device allows visual detection of occlusal abnormality by means of assymmetry index (AI) . This study was designed to investigate how the muscle tension recorded to AI obtained with MBM.
The 50% AI of the masseter was found significantly correlated positively with the muscle activity at rest, muscle activity during clenching and assymmetry of the tonic neck reflex. The positiveness and negativeness of 50% AI well agreed with the unilateral dominance of these parameters. The left-right difference in the number of teeth in contact (by T-Scan) was also correlated to the 50% AI. However, the positiveness and negativeness of the left-right difference differed in some of the subjects.
