Characteristics of condylar movement during lateral excursion in children with early mixed dentition
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概要
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Evaluation of the function of the temporomandibular joint in healthy children is important. The purpose of this study was to investigate characteristics of condylar movement during lateral excursion in children in consideration of the differences of jaw length and jaw width between children and adults. Eighteen healthy subjects (thirty-six joints total) with normal occlusion were divided into two age groups : early mixed dentition group (4 boys, 5 girls, 8-10 years old, mean 8 years 11 months) and permanent dentition group (2 men, 7 women, 23-28 years old, mean 25 years 9 months). Jaw movements were measured with 6 degrees of freedom jaw tracking device. Characteristics of condylar movement in children were investigated by three-dimensional condylar path distance during lateral excursion. The lateral excursion was done from the intercuspal position. The distance of condylar path was calculated at 1.0mm interval from 1.0 to 5.0mm of incisal path (D100%). Furthermore, the distance of condylar path was calculated at 0.9mm interval from 0.9 to 4.5mm of incisal path (in children only, D90%) in consideration of the differences of jaw length and jaw width between children and adults. The distance between incisal point and anatomical center point of condyle (IP-CP) and the distance between left side anatomical center point of condyle and right side anatomical center point of condyle (LCP-RCP) were significantly smaller in children than in adults. IP-CP and LCP-RCP in children were about 90% of those in adults. The distance of working condylar path was significantly larger in children than in adults when the distance of incisal path was at D100% and D90%. The distance of working condylar path did not show significant correlation with both the jaw length and the jaw width in children. These results suggest that the working condylar movement during lateral excursion in children has higher mobility than that of adults without it is influenced by difference of jaw size between children and adults.
- 2005-02-28
著者
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NISHINO Mizuho
Department of Pediatric Dentistry, Institute of Health Biosciences, The University of Tokushima Grad
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Nishino Mizuho
Department Of Pediatric Dentistry Social And Environmental Medicine Integrated Sciences Of Translati
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Nishino Mizuho
Department Of Pediatric Dentistry Institute Of Health Biosciences The University Of Tokushima Gradua
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KORI Yukiko
Department of Pediatric Dentistry, The University of Tokushima School of Dentistry
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Kori Yukiko
Department Of Pediatric Dentistry Social And Environmental Medicine Integrated Sciences Of Translati
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Yamaguchi Kimiko
Department of Pediatric Dentistry, Social and Environmental Medicine, Integrated Sciences of Transla
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Kitaoka Yuko
Department of Pediatric Dentistry, Social and Environmental Medicine, Integrated Sciences of Transla
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Yamaguchi Kimiko
Department Of Pediatric Dentistry Social And Environmental Medicine Integrated Sciences Of Translati
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Kitaoka Yuko
Department Of Pediatric Dentistry Social And Environmental Medicine Integrated Sciences Of Translati
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Yamaguchi Kimiko
Department of Chemistry, Faculty of Science, Osaka City University
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