Electromyographic activity of superficial masseter and anterior temporal muscles during unilateral mastication of artificial test foods with different textures in healthy subjects
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This study aimed to examine the electromyographic activity of superficial masseter and anterior temporal muscles during chewing gum and gummy jelly mastication in healthy subjects to reveal the difference of neuromuscular control of jaw-closing muscles, according to the food texture.
Materials and methods
Electromyographic activity was recorded in 30 adults with Angle Class I occlusion and unimpaired function from the bilateral superficial masseter and anterior temporal muscles during unilateral mastication of two test foods: standardized gummy jelly and color-changeable chewing gum. Differences in normalized electromyographic activity and asymmetry index values between gummy jelly and chewing gum mastication were analyzed during the early, middle, and late phases of mandibular closure. Furthermore, changes among the three closing phases were compared for each test food.
High electromyographic activity of both muscles tended to occur bilaterally during the middle and late closing phases during gummy jelly mastication, but increased muscle activity in the late closing phase was not observed during chewing gum mastication. The asymmetry index of the superficial masseter muscle increased significantly from early to late closure, regardless of the food texture, but it tended to decrease for the anterior temporal muscle during gummy jelly mastication.
The different aspects of the chewing process between the comminution and mixing test measures are necessary to elicit the different human neuromuscular strategies of chewing for different test foods.
These characteristic EMG activities of the superficial masseter and anterior temporalis muscles may be used as supporting diagnostic information during patient assessments and a reference during evaluation of masticatory system disharmony or dysfunction.
KeywordsElectromyography Superficial masseter muscle Anterior temporal muscle Mastication
The authors would like to thank Specially Appointed Professor T. Nokubi from the Development Center for Evaluating Masticatory Function at Osaka University (Suita, Japan) for his technical suggestions on the use of gummy jelly. We also thank UHA Mikakuto Co., Ltd. (Osaka, Japan) for providing the gummy jelly.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This work was partially supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI grant program (26463099, 17K11945, and 15H05051).
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
- 14.Piancino MG, Bracco P, Vallelonga T, Merlo A, Farina D (2008) Effect of bolus hardness on the chewing pattern and activation of masticatory muscles in subjects with normal dental occlusion. J Electromyogr Kinesiol 18:931–937. https://doi.org/10.1016/j.jelekin.2007.05.006 CrossRefPubMedPubMedCentralGoogle Scholar
- 15.Takada K, Miyawaki S, Tatsuta M (1994) The effects of food consistency on jaw movement and posterior temporalis and inferior orbicularis oris muscle activities during chewing in children. Arch Oral Biol 39:793–805. https://doi.org/10.1016/0003-9969(94)90009-4 CrossRefPubMedPubMedCentralGoogle Scholar
- 16.Kitashima F, Tomonari H, Kuninori T, Uehara S, Miyawaki S (2015) Modulation of the masticatory path at the mandibular first molar throughout the masticatory sequence of a hard gummy jelly in normal occlusion. Cranio 33:263–270. https://doi.org/10.1080/08869634.2015.1097275 CrossRefPubMedPubMedCentralGoogle Scholar
- 19.Tomonari H, Ikemori T, Kubota T, Uehara S, Miyawaki S (2014) First molar cross-bite is more closely associated with a reverse chewing cycle than anterior or pre-molar cross-bite during mastication. J Oral Rehabil 41:890–896. https://doi.org/10.1111/joor.12222 CrossRefPubMedPubMedCentralGoogle Scholar
- 25.Kurushima Y, Ikebe K, Matsuda K, Enoki K, Ogata S, Yamashita M, Murakami S, Maeda Y, Osaka Twin Research Group (2015) Examination of the relationship between oral health and arterial sclerosis without genetic confounding through the study of older Japanese twins. PLoS One 10:e0127642. https://doi.org/10.1371/journal.pone.0127642 CrossRefPubMedPubMedCentralGoogle Scholar
- 32.Tomonari H, Kwon S, Kuninori T, Miyawaki S (2017) Differences between the chewing and non-chewing sides of the mandibular first molars and condyles in the closing phase during chewing in normal subjects. Arch Oral Biol 81:198–205. https://doi.org/10.1016/j.archoralbio.2017.05.006 CrossRefPubMedGoogle Scholar
- 37.Iguchi H, Magara J, Nakamura Y, Tsujimura T, Ito K, Inoue M (2015) Changes in jaw muscle activity and the physical properties of foods with different textures during chewing behaviors. Physiol Behav 152(Pt A):217–224. https://doi.org/10.1016/j.physbeh.2015.10.004 CrossRefPubMedPubMedCentralGoogle Scholar
- 38.Speksnijder CM1, Abbink JH, van der Glas HW, Janssen NG, van der Bilt A (2009) Mixing ability test compared with a comminution test in persons with normal and compromised masticatory performance. Eur J Oral Sci 117(5):580–586. https://doi.org/10.1111/j.1600-0722.2009.00675.x