[Study on relationship between anterior components of lateral occlusion and muscle activity. Part 1. Anterior components of lateral occlusion].
a) Angle of frontal and horizontal inclination b) position c) numbers and d) area of the contact points at several lateral occlusions which have different distances from the intercuspal position (ICP) were examined on 12 normal subjects to suggest the normal form of lateral occlusion. Each lateral contact point was different due to the LED jaw tracing device with which the angle was measured, and the position, numbers and the area were measured using black silicon methods. The results were as follows: 1. On the angle of frontal inclination, 70% of the subjects showed 25-45 degrees, and especially at the canine's edge to the edge lateral position (EDGE position), C.P. group and G.F. group had significantly different frontal angles. The angle of horizontal inclination had a negative correlation to the frontal inclination, 70% of the subjects showed 20-35 degrees for this angle. 2. The angle of frontal and horizontal inclination was not affected by the balancing contacts. 3. At a 2 mm lateral position from the ICP, the correlation between the angle of frontal inclination with the numbers and area of lateral occlusal contact was more negative than that at another lateral position.
Shinogaya
T
T
Department of Maxillo-facial Rehabilitation, Graduate School of Dentistry, Tokyo Medical and Dentistry University.
Baba
K
K
Akishige
S
S
Sakima
T
T
Matsumoto
M
M
D000328:Adult; D003766:Dental Occlusion; D006801:Humans; D008297:Male; D008410:Masticatory Muscles / Q000502:physiology*