乳歯・永久歯の早期喪失がなかった症例の永久歯列期の歯列・咬合状態 Permanent Dental Arch and Occlusion Without Early Loss of Deciduous or Permanent Teeth

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不正咬合の大きな原因の一つと考えられる乳歯あるいは永久歯の早期喪失を来すことなく永久歯列期に達した症例でも,不正歯列や不正咬合の発現することはよく知られている.しかし,どのような割合でそれらが発現するかについては,未だ明らかにされていない.そこで,乳歯列から永久歯列に至るまで乳歯あるいは永久歯の早期喪失を来すことなく経過した男児39名,女児47名,計86名の累年石膏模型を用いて,歯列および咬合状態の変化と不正歯列と不正咬合の発現について詳細に観察した.<BR>その結果,永久歯列期で正常咬合に移行した症例は30例(34.9%),不正歯列あるいは不正咬合に移行した症例は56例(65.1%)であった.<BR>これら不正歯列あるいは不正咬合に移行した56例(65.1%)のうち叢生歯列に移行した症例は23例(26.7%),空隙歯列に移行した症例は12例(14.0%),空隙・叢生歯列に移行した症例は2例(2.3%),過蓋咬合に移行した症例は6例(7.0%),上顎前突に移行した症例は3例(3.5%),反対咬合に移行した症例は2例(2.3%),臼歯部の鋏状咬合に移行した症例は8例(9.3%)であった.<BR>また,乳歯列期にターミナルプレーンが遠心段階型を呈した症例は,Angle II級の不正咬合に移行する割合が多くみられた.<BR>各症例は可及的に2か月間隔に定期検診を行ったが,症例の約2/3が不正歯列あるいは不正咬合に移行したことから,歯牙と歯槽部の大きさの不調和,上下顎の成長量の相違などの遺伝的要因が不正歯列や不正咬合の発現に大きく関与していると思われた.

It is important to know that the process of development of the dental arch without early loss of deciduous or permanent teeth is considered one of the causes of malocclusion, based on pediatric observations. The authors therefore, investigated 86 children (male: 39, female: 47). These children were arriving at the permanent dentition without early loss of deciduous or permanent teeth. The subjects had impressions taken and longitudinal casts made every two months from 3 to 28 years of age.<BR>As for the maxillary, there were 45 cases (52.3%) with normal dental arches, there were 29 cases (33.7%) with crowded dental arches, there were 12 cases (14.0%) with spaced dental arches. In the mandible, there were 44 cases (51.2%) with normal dental arches, there were 32 cases (37.2%) with crowded dental arches, and there were 10 cases (11.6%) with spaced dental arches.<BR>So, normal occlusion, therefore occurred in 30 cases (34.9%), and malocclusion occurred in 56cases (65.1%). In these malocclusions, crowded dental arches amounted to 23 cases (26.7%), spaced dental arches to 12 cases (14.0%), spaced and crowded dental arches to 2 cases (2.3%), deep overbites to 6 cases (7.0%), maxillary protrusions to 3 cases (3.5%), reserved occlusions to 2 cases (2.3%), and total scissors bites to 8 cases (9.3%). There were no cases of open bite.<BR>The cases with the distal step type of the terminal plane in the deciduous occlusion tend to malocclusion of Angle II.<BR>The results presented here suggest that <I>normal occlusion</I> occurred in about 1/3 of the cases of the permanent dental arches where there was no early loss of deciduous or permanent teeth, while malocclusion occurred in about 2/3 of the cases.<BR>Malocclusion is dependent on several factors. Of prime importance among these factors are hereditary factors such as tooth size and the size of the basal bone of the jaw accommodating the teeth, growth difference from maxillary and mandible jaws.

収録刊行物

  • 小児歯科学雑誌

    小児歯科学雑誌 35(3), 510-517, 1997-06-25

    The Japanese Society of Pediatric Dentistry

参考文献:  24件中 1-24件 を表示

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各種コード

  • NII論文ID(NAID)
    10013867530
  • NII書誌ID(NCID)
    AN00116228
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05831199
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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