Usefulness of indicators for stability of masticatory movement path
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概要
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Purpose: To clarify the usefulness of the standard deviation (SD) and SD divided by the opening distance (SD/OD) of the opening lateral, closing lateral, and vertical components of the masticatory path as indicators of the stability of masticatory movement path.<BR>Methods: Fifty subjects masticated softened chewing gum on the unilateral side for 20 s, and the movement of the mandibular incisal point was recorded. For 10 cycles from the 5th cycle of 100 cases (50 subjects chewing on either side), a picture comprising each cycle path was displayed and classified subjectively into three categories (stable, unstable, and unknown) by three evaluators. The 18, 17, and 19 cases that were assessed as stable, unknown, and unstable were classified as Groups A, B, and C, respectively. For 10 cycles from the 5th cycle, the SD and SD/OD of the opening lateral, closing lateral, and vertical components representing the movement path as indicators for the stability of the path were calculated and compared among the three groups.<BR>Results: The SD and SD/OD of the opening lateral, closing lateral, and vertical components were small in Group A, increased in Group B, and increased further in Group C. Significant differences were observed among the groups. These differences were more apparent in the assessment using the SD/OD than in the assessment using the SD.<BR>Conclusion: The SD and SD/OD of the components representing the movement path were useful as indicators for the stability of the movement path and the SD/OD appeared to be particularly useful.
- 社団法人 日本補綴歯科学会の論文
著者
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Shiga Hiroshi
Department Of Fundamental Energy Science Graduate School Of Energy Science Kyoto University
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Arakawa Ichiro
Department Of Partial And Complete Denture School Of Life Dentistry At Tokyo The Nippon Dental Unive
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Kobayashi Yoshinori
Department Of Applied Physics Faculty Of Science Science University Of Tokyo
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Yokoyama Masaoki
Department Of Partial And Complete Denture School Of Life Dentistry At Tokyo The Nippon Dental Unive
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TANAKA Akira
Department of Agricultural Chemistry, Faculty of Agriculture, Tohoku University
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