成長期児童における歯列弓形態の成長変化に関する研究  [in Japanese] Growth change of dental arch form in mixed dentition  [in Japanese]

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Author(s)

    • 葛西 一貴 KASAI Kazutaka
    • 日本大学松戸歯学部歯科矯正学講座 Department of Orthodontics, Nihon University School of Dentistry at Matsudo
    • 林 亮助 HAYASHI Ryosuke
    • 日本大学松戸歯学部歯科矯正学講座 Department of Orthodontics, Nihon University School of Dentistry at Matsudo

Abstract

本研究は,近年の日本人児童7歳から12歳(小学校1年生から6年生)までの経年口腔歯列模型を調査し,1964年の大坪らと比較することによって,歯列弓形態の成長変化の状況を解明することを目的とした.資料は29名の経年口腔歯列模型とし,各年齢における歯列弓長径,歯列弓幅径および上下顎第一大臼歯の頬舌的歯軸傾斜角を計測して以下の結果を得た.1.歯列弓長径の年間増加量ピークは,大坪らと比較し早期にみられたが,12歳において上顎は長く,下顎は短い傾向を示した.2.臼歯部幅径の年間増加量のピークは,大坪らと比較し早期にみられたが,12歳においては上下顎の歯列弓幅径は狭い傾向を示した.3.上顎第一大臼歯頬舌的歯軸傾斜角の年間増加量のピークは8歳でみられ,歯軸は頬側傾斜から舌側方向へと変化した。下顎第一大臼歯頬舌的歯軸傾斜角のピークも同様に8歳でみられ,歯軸は舌側傾斜から頬側傾斜へ変化した.以上のことから,1964年の大坪らと比較し,近年の日本人児童の歯列発育の特徴は,早熟化傾向と歯列弓幅径の狭小化傾向であった.すなわち,年間増加量のピークは低年齢化しているが,その後の成長量は少ないことが示された.また,下顎第一大臼歯の歯列弓幅径と頬舌的歯軸傾斜角は同時期に年間増加量のピークがみられ,歯列弓幅径の狭小化に第一大臼歯頬舌的歯軸傾斜角が関与していた.

The purpose of this study was to investigate growth change of the dental arch by examining the dentition (ie, 62 dental casts) of 6-11-year-old Japanese children, and comparing the findings with those obtained a half-century ago, in 1964. Arch length, dental arch width, and bucco-lingual inclination in first molar were measured and compured. The peak of growth change in the arch length was seen at an earlier stage as compared with previous findings, whereas at age 11 years the maxilla tended to be longer and the mandlbie shorter. The peak of growth change in the width of the molars was seen at an earlier stage as compared with before, but at age 11 years, the dental arch width tended to narrow. The peak in the growth of the maxillary bucco-lingual inclination in first molar was seen at age 7. The inclination changed in direction from a buccal inclination to the lingual side, the peak in the growth of the mandibular bucco-lingual inclination in first molar was also seen at age 7, and the inclination changed from a lingual inclination to a vertical direction. These findings suggest thet growth in the dentition of modern Japanese children shows earlier maturity and a narrowing of the dental arch width as compared with children in 1964. This suggests that although the peak of growth occurred at an early age, there was little subsequent growth. Furthermore, a growth peak was seen at the same period in the dental arch width and bucco-lingual inclination of the mandibular first molar, and the bucco-lingual inclination in first molar contributed to the narrowing of the dental arch width.

Journal

  • Orthod Waves-jpn.

    Orthod Waves-jpn. 69(1), 23-35, 2010-02-25

    日本矯正歯科学会

References:  45

Cited by:  1

Codes

  • NII Article ID (NAID)
    110007880290
  • NII NACSIS-CAT ID (NCID)
    AA11917839
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    13490303
  • Data Source
    CJP  CJPref  NII-ELS  NDL-Digital 
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