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• W4310472561 abstract "Abstract Background: Chewing food produces characteristic sounds of the breakage of food. Due to the limitations of sound collection devices, there have been few studies on chewing sounds in the different phases of mastication. Thus, there has been no significant progress in the field of mastication sound. In addition, the characterization of acoustic signals in mastication remains unclear. Our aim was to investigate the correlation between mastication indicators and acoustic signals and the variations of these metrics throughout the entire phase of chewing process. Methods: Fifty-two volunteers with healthy dentition consumed natural foods (peanuts), and the mastication sounds at four stages in the mastication process were recorded by a bone-conduction microphone and further analysed by the acoustic software Praat 5.4.04. The granulometry of the expectorated food boluses was characterized by the median particle size (D50, D50 a , D50 b , D50 c ) in each of the four phases of the chewing sequence. Kinematic parameters, including the chewing cycles (CC, CC a , CC b , CC c ), and the chewing frequency (CF, CF a , CF b , CF c ), and acoustic parameters, including mastication sound pitch (MP, MP a , MP b , MP c ) and mastication sound intensity (MI, MI a , MI b , MI c ) were recorded and analysed by Praat 5.5.04. Independent samples t -tests, one-way ANOVAs and Pearson correlation analyses were used where applicable. Results: Significant differences in the chewing cycles (CC, CC a , CC b , CC c) , mastication sound intensity (MI, MI a , MI b , MI c ) and granulometry of food boluses (D50, D50 a , D50 b , D50 c ) parameters were found in all four stages when compared by sex ( t- test, p <0.01, p <0.01, p <0.01, respectively). Significant differences were observed in mastication sound intensity and granulometry of the food bolus group between different phases of mastication (one-way ANOVA, p <0.01, p <0.01). Comparing all of the indicators, a highly negative correlation was found between mastication sound intensity and granulometry of food boluses at each stage of mastication: MI and D50, MI a and D50 a , MI b and D50 b , and MI c and D50 c (r=-0.94, r=-0.85, r=-0.94, r=-0.95, respectively; p <0.01). No significant correlation was found between the remaining acoustic and mastication parameters. Conclusions: Variations in mastication sound intensity and the granulometry of the food bolus were highly correlated in all four phases of mastication. Mastication sound intensity may be a new and essential approach for studying mastication." @default.
• W4310472561 created "2022-12-10" @default.
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• W4310472561 date "2022-11-30" @default.
• W4310472561 modified "2023-09-24" @default.
• W4310472561 title "Characterization of Acoustic Parameters in Phases of Masticatory Sequence" @default.
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• W4310472561 doi "https://doi.org/10.21203/rs.3.rs-2234027/v1" @default.
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