Characteristics of condylar movement during lateral excursion in children with early mixed dentition

DOI 参考文献19件 オープンアクセス
  • Yamaguchi Kimiko
    <I>Department of Pediatric Dentistry, Social and Environmental Medicine, Integrated Sciences of Translational Research, Institute of Health Biosciences, The University of Tokushima Graduate School</I>
  • Kori Yukiko
    <I>Department of Pediatric Dentistry, Social and Environmental Medicine, Integrated Sciences of Translational Research, Institute of Health Biosciences, The University of Tokushima Graduate School</I>
  • Kitaoka Yuko
    <I>Department of Pediatric Dentistry, Social and Environmental Medicine, Integrated Sciences of Translational Research, Institute of Health Biosciences, The University of Tokushima Graduate School</I>
  • Nishino Mizuho
    <I>Department of Pediatric Dentistry, Social and Environmental Medicine, Integrated Sciences of Translational Research, Institute of Health Biosciences, The University of Tokushima Graduate School</I>

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説明

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 1.0 mm interval from 1.0 to 5.0 mm of incisal path (D100%) . Furthermore, the distance of condylar path was calculated at 0.9 mm interval from 0.9 to 4.5 mm 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.

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