The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Changes in occlusal force and occlusal contact area after orthodontic treatment

교정 치료 후 교합력, 교합면적의 변화

  • Choi, Yoon-Jeong (Department of Orthodontics, Gangnam Severance Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Crania-facial Deformity, Yonsei University) ;
  • Chung, Choo-Ryung J. (Department of Orthodontics, Gangnam Severance Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Crania-facial Deformity, Yonsei University) ;
  • Kim, Kyung-Ho (Department of Orthodontics, Gangnam Severance Hospital, College of Dentistry, Oral Science Research Institute, The Institute of Crania-facial Deformity, Yonsei University)
  • 최윤정 (연세대학교 치과대학 교정학교실, 강남세브란스병원 치과교정과, 구강과학연구소, 두개안면기형 연구소) ;
  • 정주령 (연세대학교 치과대학 교정학교실, 강남세브란스병원 치과교정과, 구강과학연구소, 두개안면기형 연구소) ;
  • 김경호 (연세대학교 치과대학 교정학교실, 강남세브란스병원 치과교정과, 구강과학연구소, 두개안면기형 연구소)
  • Received : 2010.03.20
  • Accepted : 2010.05.11
  • Published : 2010.06.30
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Abstract

Objective: This study was performed to evaluate functional changes of occlusion after orthodontic treatment by measuring the occlusal force (OcFr) and occlusal contact area (OcAr), and to compare OcFr and OcAr change according to premolar extractions. Methods: Data were obtained from 74 patients who had finished orthodontic treatment using fixed appliance aged between 18 and 40 years. Subjects were divided into groups who had four premolars extractions or non-extraction (Male extraction-16, Male nonextraction-18, Female extraction-19, Female nonextraction-21). All subjects were asked to bite pressure-sensitive sheets into maximum intercuspation with maximum bite force, and OcFr and OcAr were evaluated by measuring the sheet with a CCD camera. Records were taken right after debonding, 1 week, 1 month, 3 months, 6 months and 1 year after debonding. Results: OcFr and OcAr increased gradually in all groups during the 1 year retention period (p < 0.05). Male groups showed higher OcFr and OcAr than female groups throughout the retention periods (p < 0.05). There were no statistically significant differences of OcFr and OcAr between extraction and non-extraction groups in both males and females (p > 0.05). Conclusions: Occlusion was improved functionally throughout the 1 year retention, and premolar extraction did not induce a decline in the functional aspect of occlusion.

고정식 교정장치를 이용한 교정치료 후 교합의 기능적 변화를 평가하기 위해, 교합력 및 교합접촉면적을 측정하여 단기적인 변화 양상을 확인하고 소구치 발치 여부에 따른 차이를 파악하였다. 고정식 교정장치로 치료를 종료한 18세 에서40세 사이의 성인을 남자군과 여자군으로 분류하고, 각각의 군을 4개의 소구치를 발치한 군과 비발치로 치료한 군으로 세부 분류하였다(남자발치군 16명, 남자비발치군 18명, 여자발치군 19명, 여자비발치군 21명). Dental prescalesystem (Fuji Film Corp., Tokyo, Japan)의 pressure sensitive sheet를 5초간 최대교두감합위에서 최대근력으로 교합하도록 한 뒤 CCD camera를 이용해 교합력과 교합면적을 측정하였다. 고정식 교정장치를 제거하고 고정식유지장치를 붙인 직후, 교정장치 제거 1주일, 1개월, 3개월, 6개월, 1년 뒤에 각각 측정하여 비교하였다. 모든 군에서 교정장치 제거 후 1년간의 유지기간 동안 교합력과 교합면적은 점진적으로 증가하였다 (p < 0.05). 모든 측정 시기에서 남자군은 여자군보다 높은 교합력과 교합면적을 보였으며 (p < 0.05), 남자, 여자군 모두에서 발치군과 비발치군 사이에는 교합력 및 교합면적에서 통계적으로 유의한 차이가 관찰되지 않았다 (p > 0.05). 본 연구를 통해 교정치료 후 1년간의 유지기간 동안 교합이 기능적으로 향상됨을 파악하였고, 소구치 발치로 인한 교합의 기능적 저하는 없을 것이라 추측할 수 있었다.

Keywords

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