The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Changes in surface roughness of bracket and wire after experimental sliding - preliminary study using an atomic force microscopy

브라켓과 탄선 간의 마찰 전후 표면 변화 분석 - 원자현미경을 이용한 예비연구

  • Lee, Tae-Hee (Department of Orthodontics, Kyung-Hee University School of Dentistry) ;
  • Park, Ki-Ho (Department of Orthodontics, Kyung-Hee University School of Dentistry) ;
  • Jeon, Ji-Yun ;
  • Kim, Su-Jung (Department of Orthodontics, Kyung-Hee University School of Dentistry) ;
  • Park, Hun-Kuk (Department of Biomedical Engineering, Kyung-Hee University School of Medicine) ;
  • Park, Young-Guk (Department of Orthodontics, Kyung-Hee University School of Dentistry)
  • 이태희 (경희대학교 치의학전문대학원 교정학교실) ;
  • 박기호 (경희대학교 치의학전문대학원 교정학교실) ;
  • 전지윤 ;
  • 김수정 (경희대학교 치의학전문대학원 교정학교실) ;
  • 박헌국 (경희대학교 의학전문대학원 의공학교실) ;
  • 박영국 (경희대학교 치의학전문대학원 교정학교실)
  • Received : 2009.11.02
  • Accepted : 2010.02.17
  • Published : 2010.06.30
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Abstract

Objective: The surface roughness of orthodontic materials is an essential factor that determines the coefficient of friction and the effectiveness of tooth movement. The aim of this study is to evaluate the surface roughness change of the brackets and wires after experimental sliding quantitatively. Methods: Before and after experimental sliding tests, the surface roughness of stainless steel brackets, ceramic brackets, stainless steel wires, and beta-titanium (TMA) wires were investigated and compared using atomic force microscopy (AFM). Results: After sliding tests, changes in the surface of the wire were greater than changes in the bracket slot surface. The surface roughness of the stainless steel bracket was not significantly increased after sliding test, whereas the roughness of ceramic brackets was decreased. Both the surface roughness of stainless steel and TMA wires were increased after sliding test. More changes were observed on the ceramic bracket than the stainless steel bracket. Conclusions: AFM is a valuable research tool when analyzing the surface roughness of the brackets and wires quantitatively.

브라켓과 호선 간에 발생하는 마찰은 치아 이동의 효율에 상당한 영향을 미친다. 마찰력에 기여하는 요소 중 특히 브라켓과 호선의 표면조도는 중요한 요소이다. 본 연구는 브라켓과 탄선을 실험적으로 마찰시킨 후, 원자현미경 (atomic force microscope, AFM)을 사용하여 브라켓 슬롯과 교정용 탄선의 표면 조도 변화를 정성적, 정량적으로 측정하고 비교 평가하여 브라켓과 호선 간의 마찰이 각각의 표면 변화에 미치는 영향을 규명하고자 시행되었다. 스테인리스 스틸 브라켓과 세라믹 브라켓에 각각 스테인리스 스틸 탄선과 TMA 탄선을 실험적으로 활주마찰시킨 후 각각을 원자현미경을 이용하여 표면을 관찰하였다. 실험결과 브라켓보다는 교정용 탄선에서 활주마찰 후에 더 많은 표면 변화가 나타났다. 또한 활주마찰 후에 스테인리스 스틸 브라켓은 표면 조도의 유의한 변화가 없었으나 세라믹 브라켓은 표면 조도가 감소하였다. 그리고 교정용 탄선은 모두 활주마찰 후에 표면 조도가 증가하였으며 이러한 표면 변화는 스테인리스 스틸 브라켓보다 세라믹 브라켓과의 활주마찰 후에 더 큰 것으로 관찰되었다. 본 실험으로 원자현미경은 브라켓 슬롯과 탄선의 표면 조도를 정량적으로 측정하는 데에 유용한 수단임을 알 수 있었다.

Keywords

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