Early histological change in hard tissue from orthodontic force placed on microscrews in ovariectomized rats

난소 적출 백서에 식립된 마이크로스크류에 교정력 부여 시 나타난 초기 경조직 변화에 관한 연구

  • Lee, Dea-Seung (Department of Orthodontics, School of Dentistry, Dankook University) ;
  • Chang, Moon-Jung (Department of Food and Nutrition, School of Kookmin University) ;
  • Lee, Jin-Woo (Department of Orthodontics, School of Dentistry, Dankook University)
  • 이대승 (단국대학교 치과대학 교정학교실) ;
  • 장문정 (국민대학교 식품영양학과) ;
  • 이진우 (단국대학교 치과대학 교정학교실)
  • Published : 2006.04.30

Abstract

Most elderly women experience a decrease in their bone density due to a deficiency of calcium intake, ovariectomy, or menopause. This study evaluated the usability of the microscrew as a skeletal anchorage system in these orthodontic treatment cases, using rats as a research group. The 4 month old sprague-dawley species rats were divided into two groups, the OS (Ovariectomy Screw), and the SS (Sham operation Screw) group. In both the OS and SS groups, microscrews were implanted into the palatal bone between the upper molar teeth and two upper incisors were retracted using NETE coil spring with 75 g of force. After 3days, the again after 7 days, 7 rats in each group were sacrificed. Three days before they were sacrificed, Alizarin red S was intraperitoneally injected, and their maxillary bone, tibia and blood from their hearts were taken. The components of the extracted blood were biochemically analyzed and non-decalcified grinding resin sections for maxillary bone and tibia were made. The sections were examined with a polarization microscope, and fluorescent microscope. Smaller concentrations of Ca and P, the inorganic substances closely related to bone density, were found in the extracted blood of the OS group. Both OS and SS groups showed a possibility of bone remodeling with a high concentration of ALP after 7 days. An increase in bone density on the tension and compression sides of the microscrew and the tension side of the tooth for both OS and SS groups was confirmed with a polarization microscope. However, the bone density of the pressure side of the tooth and apical side was decreased. More deposits of Alizarin red S in the bone after 7 days rather than 3 days seen with a fluorescent microscope suggested the existence of new bone formation.

중년 이후의 여성의 경우 칼슘 섭취가 부족하거나, 인위적인 난소 적출 또는 폐경 등으로 인하여 골밀도가 감소하는 경향이 있다. 이 경우 교정 치료 시, 골내 고정원으로 마이크로스크류를 이용할 수 있는지를 알아보기 위하여, 생후 4개월 된 Sprague-Dawley계 백서를 실험군으로 난소 적출(Ovariectomy Screw, OS)군, 대조군으로 Sham operation 시행한(Sham operation Screw, SS) 군의 두 군으로 나누었다. OS군과 SS군 모두 상악 대구치 사이 구개골에 마이크로스크류를 식립하였고, NiTi coil spring을 이용하여, 상악 중절치 2개를 견인하였다. 각 군당 3일, 7일 후 7마리씩 희생시켰다. 희생 3일전 Alizarin red S를 주입하고, 상악골, 장골, 심장혈을 채득한 후, 심장혈을 성분분석하고, 상악골과 장골은 비탈회 레진표본을 제작하여, 편광현미경, 형광현미경으로 관찰하였다. 심장혈을 통한 성분 조사 결과 OS군, SS군 모두 7일째 alkaline phosphatase (ALP)의 농도가 높게 나타나 골개조의 가능성을 보였고, 편광현미경 사진에서 SO, SS군에서 모두 마이크로스크류의 압박측, 긴장측, 치아의 긴장측에서 3일 보다 7일에서 기존골에 비하여 골밀도가 낮은 영역이 적었고, 치아의 압박측에서는 골밀도가 낮은 영역이 증가하였다. 형광 현미경 관찰결과는 3일째 보다 7일째에 더 Alizarin red S로 침착된 골이 나타난 것으로 보아, 새로운 골의 형성이 있었음을 나타내었다. 골다공증이 유도된 백서에서 계속된 골의 흡수보다는 골개조의 가능성이 증가하고, 신생골의 형성이 증가함을 확인할 수 있었고, 이는 골다공증에서도 마이크로스크류의 식립으로 고정원 확보가 가능한 것으로 생각한다.

Keywords

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