Normal ranges of asymmetry and activity indices in masseter and temporal muscle during intercuspation

Abstract

We attempted to determine normal ranges of asymmetry and activity indices, as proposed by Naeije et al., in masseter and temporal muscles during intercuspation at clenching levels of 10% and 50% of maximum voluntary contraction. Normal ranges were calculated with parametric statistics on an asymmetry index in 88 males and 77 females (mean age 22.7 yrs), and on an activity index on each side in 47 males and 39 females (mean age 22.5 yrs).