The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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A TOMOGRAPHIC STUDY ON ORO-NASAL DIMENSIONAL CHANGES FOLLOWING RAPID PALATAL EXPANSION

정중구개 봉합선 급속확장시 구강 및 비강 변화에 관한 단층 두부방사선적 연구

  • Hwang, In Joon (Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Park, Young Chel (Department of Orthodontics, College of Dentistry, Yonsei University)
  • 황인준 (연세대학교 치과대학 교정학교실) ;
  • 박영철 (연세대학교 치과대학 교정학교실)
  • Published : 1991.11.30
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Abstract

It was said that early rapid palatal expansion was the treatment of choice in case of maxillary constriction with posterior crossbite. The author tried to assess dimensional changes of nasal and oral cavity before rapid palatal expansion and over 4 months of retention by use of three coronal tomograms through the incisal, molar, and maxillary tuberosity areas. The subjects of this study were consisted of 9 boys and 11 girls ranging from 11 to 13 years old. The results were as follows: 1. A mean change in maxillary first molar width was 3.68mm and a mean change in nasal cavity width was 2.26mm after 6.70mm expansion by Hyrax-type screw and over 4 months of retention tomographically in molar cut. 2. A change in nasal cavity width tomographically showed in order of molar cut, incisal cut, maxillary tuberosity cut respectively. 3. There was no correlation between changes in oral cavity width and nasal cavity width.

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