A study on three-dimensional condylar movement in children

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  • YAMAGUCHI Kimiko
    Department of Pediatric Dentistry, The University of Tokushima School of Dentistry
  • KORI Yukiko
    Department of Pediatric Dentistry, The University of Tokushima School of Dentistry
  • NISHINO Mizuho
    Department of Pediatric Dentistry, The University of Tokushima School of Dentistry

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  • 小児顆頭運動の3次元解析

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Abstract

Evaluation of temporomandibular joint function in healthy children is important. The purpose of this study was to investigate characteristics of condylar movement during lateral excursion in children. Twenty-two subjects with normal occlusion were divided into three age groups: primary dentition group (3 girls), early mixed dentition group (2 boys, 7 girls), and permanent dentition group (2 males, 8 females). Jaw movement was measured with a 6 degrees of freedom jaw tracking device. Jaw movement of the whole mandible was simulated on the graphic terminal. Characteristics of condylar movement in children were investigated by three-dimensional condylar path distance during lateral excursion. The results obtained were as follows: 1 . The distance of working condylar path during lateral excursion did not show significant difference between kinematic condylar point and another condylar point in children. 2 . The distance of working condylar path during lateral excursion was significantly larger in children than in adults and decreased with growth. 3 . The distance of working condylar path along the anterior-posterior and superior-inferior axes during lateral excursion was decreased with growth. Along the left-right axis, the distance of condylar path during lateral excursion was larger in early mixed dentition group than in other groups. The results suggested that condylar movement in children is stabilized with growth, however, in the early mixed dentition group, lateral mobility in the condyle is apparent.

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