Development of a simple method to measure masseter muscle mass

Murakami, Masaharu; Iijima, Katsuya; Watanabe, Yutaka; Tanaka, T.; Iwasa, Yasuyuki; Edahiro, Ayako; Ohara, Yuki; Motokawa, Köiti; Shirobe, Maki; Hirano, Hirohiko

doi:10.1111/ger.12487

Cited by 10 publications

(17 citation statements)

References 19 publications

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“…These limitations may interfere with the common use of MRI-MMM measurements. Recently, we developed a more readily applied method of masseter muscle mass estimation based on muscle morphology and ultrasound-measured muscle thickness [ 8 ]. The masseter muscle mass estimated by this method was validated against the MRI-MMM, the gold standard, and found to be appropriate for masseter muscle mass measurement in large cohorts.…”

Section: Discussionmentioning

confidence: 99%

“…Fourth, we did not examine masticatory muscles other than the masseter muscle. The masseter muscle plays a significant role in mastication [ 7 , 8 ], and the Manual for Improvement of Oral Function issued by the Ministry of Health, Labor, and Welfare in Japan recommends that the masseter muscle is palpated in the evaluation of oral function [ 41 ]. However, the masseter muscle works in combination with other skeletal muscles in the head and neck region, including the temporal muscle and medial and lateral pterygoid muscles.…”

Section: Discussionmentioning

confidence: 99%

“…The e-MMM was obtained by multiplying the vertical length, width, and thickness of the masseter muscle, which were measured according to a published protocol [ 8 ]. The right masseter muscle was the objective of the assessment, and the detailed protocol was as follows.…”

Section: Methodsmentioning

confidence: 99%

“…The number of natural teeth was defined as the number of remaining teeth, excluding residual roots. The number of functional teeth was defined as the number of natural teeth, artificial teeth in dentures, pontics on bridges, and implants [ 8 ]. The number of functional teeth was considered a measure of the dentition status [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…The masticatory muscles play an important role in oral function, especially mastication [ 6 ]. In particular, the masseter muscle is significant for mastication [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Interrelationships among whole-body skeletal muscle mass, masseter muscle mass, oral function, and dentition status in older Japanese adults

et al. 2021

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Background Generalized loss of skeletal muscle mass (SMM) may modulate or otherwise affect the loss of masseter muscle mass and be responsible for low masseter muscle performance and strength (i.e., low oral function). Moreover, dentition status can affect oral function independent of the muscle state. This cross-sectional study aimed to simultaneously investigate the relationships among whole-body SMM, masseter muscle mass, oral function (masseter muscle performance and strength), and dentition status in 1349 Japanese adults (mean age = 73.6 years). Methods We determined the estimated masseter muscle mass (e-MMM) based on morphological measurements of the masseter muscle. Masseter muscle performance was assessed via masticatory performance evaluation scores using gum, and strength was assessed as the maximal occlusal force. Dentition status was assessed as the number of functional teeth. SMM was measured by bioelectrical impedance analysis. Structural equation modeling stratified by sex was employed to investigate associations among SMM, e-MMM, gum score, occlusal force, and number of functional teeth. Results The direct path from SMM to e-MMM was statistically significant, as was the direct path from e-MMM to oral function (gum score and maximum occlusal force) for both sexes. We additionally confirmed that SMM indirectly affected gum score and maximum occlusal force via e-MMM (men; standardized coefficient [95% CI] = 3.64 [1.31 to 5.96] for maximum occlusal force and 0.01 [0.01 to 0.02] for gum score, women; 2.01 [0.38 to 3.81] for maximum occlusal force and 0.01 [0.002 to 0.01] for gum score). The number of functional teeth had direct effects on e-MMM, gum score, and maximum occlusal force. Conclusions Low SMM was significantly indirectly associated with poor oral function through a low masseter muscle mass, and dentition status was independently associated with oral function.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The masticatory muscles play an important role in oral function, especially mastication [ 6 ]. In particular, the masseter muscle is significant for mastication [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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