Longitudinal Study of the Process of Crowding in Children with Normal Occlusion in the Deciduous Dentition

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  • Kaihara Yasutaka
    Department of Pediatric Dentistry, Hiroshima University Dental Hospital
  • Saiga Kaori
    Department of Pediatric Dentistry Hiroshima University Graduate School of Biomedical Sciences
  • Nakae Hisami
    Department of Pediatric Dentistry, Hiroshima University Dental Hospital
  • Kuramoto Meiko
    Department of Pediatric Dentistry Hiroshima University Graduate School of Biomedical Sciences
  • Makihira Mika
    Department of Pediatric Dentistry, Hiroshima University Dental Hospital
  • Suzuki Junji
    Department of Pediatric Dentistry Hiroshima University Graduate School of Biomedical Sciences
  • Kozai Katsuyuki
    Department of Pediatric Dentistry Hiroshima University Graduate School of Biomedical Sciences

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  • 乳歯列期に正常咬合である小児の叢生発現の過程に関する縦断研究

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Abstract

Children with normal occlusion and interdental spaces in deciduous dentition were divided into two groups, of those with crowding at the stage of permanent dentition (crowding group) and those without (normal group). Differences in changes in the dental arch that accompanied growth and development were compared using study 16 models.<BR>The results of this study were as follows:<BR>1. Among children with normal occlusion and interdental spaces in the deciduous dentition,43.8%developed crowding at the stage of permanent dentition.<BR>2. The crowding group showed a tendency to have fewer sites of embrasure in the deciduous dentition than the normal group.<BR>3. The mesiodistal width of dental crowns in both deciduous teeth and permanent teeth tended to be larger in the crowding group than in the normal group.<BR>4. The intercanine width in both the maxilla and mandible at each age and its increment from age 4to age 12 tended to be smaller in the crowding group than in the normal group.<BR>5. No significant difference between groups was seen in dental arch length in either mean value or variation. The increment of dental arch length was smaller than that of the intercanine width in both groups.<BR>6. Dentition that was crowded during mixed dentition mostly remained crowded in permanent dentition.<BR>The above suggests that regarding the occurrence of crowding, attention should focus on the mesiodistal width of dental crowns, the size and increment of dental arch width, and whether there is crowding in mixed dentition, in addition to the amount of interdental spaces in deciduous dentition.

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