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Variables related to masseter muscle function: a maximum R 2 improvement analysis
Author(s) -
Bakke Merete,
Stoltze Kaj,
Tuxen Anette
Publication year - 1993
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1993.tb01656.x
Subject(s) - masseter muscle , bite force quotient , malocclusion , stepwise regression , electromyography , molar , orthodontics , mastication , dentistry , univariate analysis , medicine , anatomy , psychology , physical medicine and rehabilitation , multivariate analysis
A multiple linear regression analysis, with stepwise maximum R 2 improvement technique by forward selection and pair switching, was used to select the occlusal, morphologic, and histologic variables which explained most of the variation in bite force and electric masseter muscle activity. The variables comprised tooth contact and facial morphology together with thickness and fiber characteristics of the masseter muscle. The study included 13 healthy women, 21–28 yr of age, with a minimum of 24 teeth and no serious malocclusion. Significant exploratory models (R 2 : 0.55–0.85) were shown concerning bite force, and electromyographic amplitude during resting posture, maximal voluntary contraction (ICP), and unilateral chewing, as well as contraction time (chewing side). Muscle thickness and molar contact had a significant, positive effect on the level of forceful muscle contraction. The explorative model both demonstrated explicable relations, and offered better insight into interrelations than did univariate analysis.