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Relationship between displacement of the masseter muscle during biting and masseter muscle quality and bite force in healthy elderly persons
Author(s) -
Hara Koji,
Tohara Haruka,
Namiki Chizuru,
Yamaguchi Kohei,
Chantaramanee Ariya,
Kobayashi Kenichiro,
Saito Takayuki,
Nakagawa Kazuharu,
Okumura Takuma,
Yoshimi Kanako,
Nakane Ayako,
Furuya Junichi,
Minakuchi Shunsuke
Publication year - 2020
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/joor.12915
Subject(s) - biting , bite force quotient , masseter muscle , medicine , dentistry , orthodontics , biology , ecology
Background Although age‐related changes in muscle quality influence muscle strength, the relationship between masseter muscle (MM) quality and maximum biting force (MBF) has never been studied. Objective The aims of the study were to verify the relationship among MM quality, MBF, and the displacement of the MM while biting forcefully (MMD) and to clarify the age‐related decline in MBF in healthy elderly persons. Methods Seventy‐four healthy community‐dwelling individuals (mean age, >65 years) from Tokyo metropolis were recruited. The thickness (index of muscle quantity), echo intensity (index of muscle quality) and displacement of the MM while biting forcefully (MMT, MMEI and MMD, respectively) were measured by ultrasonography. MBF was measured using a pressure‐sensitive sheet. Independent predictors of MBF and MMD were determined using multivariate linear regression analyses adjusted for age, sex and the number of present teeth. Results MBF was significantly correlated with the number of teeth (β = 0.577, P < .001) and MMD (β = 0.302, P = .015), but not with MMT (β = 0.019, P = .868) or MMEI (β = 0.054 P = .703). MMD was significantly correlated with MMEI (β = −0.606, P < .001), but not with MMT (β = 0.048, P = .681) or the number of teeth (β = 0.065, P = .613). Conclusions MMEI was associated with MMD, an index of MBF, regardless of tooth number. The age‐related quality change in the MM might cause a decrease in its contraction, resulting in age‐related decline in MBF.