Muscle organization in individuals with and without pain and joint dysfunction

Central nervous system organization of masticatory muscles determines the magnitude of joint and muscle forces. Validated computer-assisted models of neuromuscular organization during biting were used to determine organization in individuals with and without temporomandibular disorders (TMD). Ninety...

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Bibliographic Details
Published in:Journal of dental research Vol. 91; no. 6; p. 568
Main Authors: Nickel, J C, Gonzalez, Y M, McCall, W D, Ohrbach, R, Marx, D B, Liu, H, Iwasaki, L R
Format: Journal Article
Language:English
Published: United States 01.06.2012
Subjects:
Adult
Biomechanical Phenomena
Bite Force
Case-Control Studies
Chi-Square Distribution
Computer Simulation
Dental Stress Analysis
Electromyography
Facial Pain - physiopathology
Female
Humans
Joint Dislocations
Linear Models
Male
Masticatory Muscles - physiology
Masticatory Muscles - physiopathology
Middle Aged
Models, Biological
Temporomandibular Joint Disorders - physiopathology
Young Adult
ISSN:1544-0591, 1544-0591
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Summary:Central nervous system organization of masticatory muscles determines the magnitude of joint and muscle forces. Validated computer-assisted models of neuromuscular organization during biting were used to determine organization in individuals with and without temporomandibular disorders (TMD). Ninety-one individuals (47 women, 44 men) were assigned to one of four diagnostic groups based on the presence (+) or absence (-) of pain (P) and bilateral temporomandibular joint disc displacement (DD). Electromyography and bite-forces were measured during right and left incisor and molar biting. Two three-dimensional models employing neuromuscular objectives of minimization of joint loads (MJL) or muscle effort (MME) simulated biting tasks. Evaluations of diagnostic group and gender effects on choice of best-fit model were by analysis of variance (ANOVA) and Tukey-Kramer post hoc tests, evaluations of right-left symmetry were by Chi-square and Fisher's exact statistics, and evaluations of model accuracy were by within-subject linear regressions. MME was the best-fit during left molar biting in +DD individuals and incisor biting in men (all p < 0.03). Incisor biting symmetry in muscle organization was significantly higher (p < 0.03) in healthy individuals compared with those with TMD. Within-subject regressions showed that best-fit model errors were similar among groups: 8 to 15% (0.68 ≤ R(2) ≤ 0.74). These computer-assisted models predicted muscle organization during static biting in humans with and without TMDs.
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ISSN:1544-0591
1544-0591
DOI:10.1177/0022034512445909