Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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Investigation of the Shear Bond Strength of Orthodontic Buttons by Light Curing Using an Extended Optic Fiber

광섬유를 이용한 광중합에 따른 교정용 버튼의 전단결합강도에 관한 연구

  • Yoon, Garam (Department of Pediatric Dentistry, School of Dentistry, Chosun University) ;
  • Lee, Nanyoung (Department of Pediatric Dentistry, School of Dentistry, Chosun University) ;
  • Lee, Sangho (Department of Pediatric Dentistry, School of Dentistry, Chosun University) ;
  • Jih, Myeongkwan (Department of Pediatric Dentistry, School of Dentistry, Chosun University) ;
  • Choi, Wonseok (Department of Pediatric Dentistry, School of Dentistry, Chosun University) ;
  • Sung, Minah (Department of Pediatric Dentistry, School of Dentistry, Chosun University)
  • 윤가람 (조선대학교 치과대학 소아치과학교실) ;
  • 이난영 (조선대학교 치과대학 소아치과학교실) ;
  • 이상호 (조선대학교 치과대학 소아치과학교실) ;
  • 지명관 (조선대학교 치과대학 소아치과학교실) ;
  • 최원석 (조선대학교 치과대학 소아치과학교실) ;
  • 성민아 (조선대학교 치과대학 소아치과학교실)
  • Received : 2020.09.29
  • Accepted : 2020.11.04
  • Published : 2021.02.28
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Abstract

The objective of this study is to analyze the shear bond strength of orthodontic buttons according to light tip distance and optic fiber diameter when an extended optic fiber was applied to the tip of a curing light unit. In this study, 315 extracted premolar teeth were divided into 3 groups. Orthodontic buttons were attached using no optic fibers (Group I), 3.0 mm diameter optic fibers (Group II), or 5.0 mm diameter optic fibers (Group III). Each group was divided into subgroups A - C (5.0, 10.0, and 15.0 mm light tip distance), respectively. Shear bond strength was then measured while varying the light tip distance. In group I, shear bond strength significantly decreased as the light tip distance increased. When the shear bond strength was evaluated according to the optic fiber diameter, no statistical significance was observed in group of 5.0 mm light tip distance. Compared with group IB, group IIIB showed significantly greater shear bond strength. Compared with group IC, all groups using 3.0 or 5.0 mm diameter optic fibers showed significantly greater shear bond strength. Therefore, when a curing light unit has poor accessibility, optic fibers with a large diameter should be considered.

이 연구의 목적은 광중합기의 조사단에 광섬유를 적용하였을 때, 조사단과 교정용 버튼의 베이스 사이의 거리와 광섬유 직경에 따른 교정용 버튼의 전단결합강도를 평가하는 것이다. 발치된 소구치 315개를 I, II, III군으로 나누어 광섬유를 사용하지 않거나 3.0, 5.0 mm 직경의 광섬유를 사용하였고 각 군을 A, B, C의 하위군으로 분리하여 5.0, 10.0, 15.0 mm 깊이로 조사단과의 거리를 설정하여 전단결합강도를 측정하였다. 거리 증가에 따라 I군의 전단결합강도가 유의하게 감소하였다. 광섬유 직경에 따른 전단결합강도를 평가했을 때 거리가 5.0 mm인 경우 군 간에 유의성이 관찰되지 않았고 10.0 mm인 경우 IB군에 비해 IIIB군에서 유의하게 높은 전단결합강도를 보였고 15.0 mm인 경우 IC군에 비해 IIC, IIIC군 모두 유의하게 높은 전단결합강도를 보였다. 고로 광중합기의 접근성이 떨어질 때, 광섬유 사용이 추천되며 직경이 큰 광섬유가 성공적인 버튼 부착에 도움이 될 것으로 사료된다.

Keywords

Acknowledgement

This study was supported by research fund from Chosun University Dental Hospital, 2021.

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