The Movement of the Chin during Mastication

The purpose of this study was to evaluate suitability of the soft tissue on the chin as a reference point in measuring masticatory movements. The movements of the chin and a lower incisor during mastication were measured simultaneously using a real-time measuring system for three-dimensional movemen...

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Published inNihon Hotetsu Shika Gakkai Zasshi Vol. 39; no. 6; pp. 1132 - 1141
Main Authors Kumagai, Hiroshi, Hirano, Yasuyoshi, Minakuchi, Syunsuke, Sekita, Toshiaki, Suzuki, Tetsuya, Kobayashi, Ken-ichi, Nagao, Masanori
Format Journal Article
LanguageEnglish
Japanese
Published Japan Prosthodontic Society 1995
Subjects
chin
mandibular movement
mastication
soft tissue
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Abstract The purpose of this study was to evaluate suitability of the soft tissue on the chin as a reference point in measuring masticatory movements. The movements of the chin and a lower incisor during mastication were measured simultaneously using a real-time measuring system for three-dimensional movements of soft tissues (3-D Auto Tracking System). The results were as follows 1. Computer-based analysis was developed to divide the whole-chewing period into single stroke and determine the beginning of the opening, closing, occluding phase. 2. The chin movements were 1/60 sec slower than lower incisor movements at the beginning of the opening phase. 3. The chin movements were 1/60 sec faster than lower incisor movements at the beginning of the occluding phase. The results obtained in this study indicate that the soft tissue on the chin was suitable as a reference point in measuring masticatory movements.
AbstractList The purpose of this study was to evaluate suitability of the soft tissue on the chin as a reference point in measuring masticatory movements. The movements of the chin and a lower incisor during mastication were measured simultaneously using a real-time measuring system for three-dimensional movements of soft tissues (3-D Auto Tracking System). The results were as follows 1. Computer-based analysis was developed to divide the whole-chewing period into single stroke and determine the beginning of the opening, closing, occluding phase. 2. The chin movements were 1/60 sec slower than lower incisor movements at the beginning of the opening phase. 3. The chin movements were 1/60 sec faster than lower incisor movements at the beginning of the occluding phase. The results obtained in this study indicate that the soft tissue on the chin was suitable as a reference point in measuring masticatory movements.
Author Minakuchi, Syunsuke
Suzuki, Tetsuya
Nagao, Masanori
Kobayashi, Ken-ichi
Kumagai, Hiroshi
Hirano, Yasuyoshi
Sekita, Toshiaki
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  organization: Department of Geriatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University
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  fullname: Hirano, Yasuyoshi
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  fullname: Minakuchi, Syunsuke
  organization: Department of Geriatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University
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  fullname: Sekita, Toshiaki
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  fullname: Suzuki, Tetsuya
  organization: Department of Geriatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University
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  fullname: Kobayashi, Ken-ichi
  organization: Department of Geriatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University
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  fullname: Nagao, Masanori
  organization: Department of Geriatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University
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mandibular movement
mastication
soft tissue
Title The Movement of the Chin during Mastication
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