著者

小澤 美保子

出版者

社団法人 日本補綴歯科学会

雑誌

日本補綴歯科学会雑誌 (ISSN:03895386)

巻号頁・発行日

vol.36, no.4, pp.727-740, 1992-08-01 (Released:2010-08-10)

参考文献数

48

被引用文献数

1

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The purpose of this study was to investigate effects of typical Japanese eating positions on mandibular movement and EMG activities in head and neck muscles during chewing.10 males chewed gums of 3 different hardness (soft, medium and hard) in cross-legged sitting (CL), chair sitting (CS) and standing (S) positions. Mandibular movement and surface EMG signals were recorded. In each position during chewing, head movement (HM) and forward inclination of the head and body (FIH, FIB) were measured by photography.The results were as follows:1. Maximal vertical displacement was the largest in CL position in chewing of hard gum.Maximal opening velocity was the largest in S position in chewing of medium gum. Opening phase time, closing phase time and cycle time were the longest in CL position in chewing of medium and hard gum.2. Burst duration was the longest in CL position in chewing of all gums. Muscle activities at anterior temporal, posterior temporal, masseter and nuchal region of the trapezius muscles were most increased in CL position in chewing of medium and hard gum.3. HM was the largest in S position while FIH and FIB were the largest in CL position in chewing of all gums.