Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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Evaluation of Shear Bond Strength and Microleakage of Bulk-fill Resin Composites

Bulk-fill 복합레진의 상아질 전단결합강도 및 미세누출

  • Lee, Hanbyeol (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Seo, Hyunwoo (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Lee, Juhyun (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Howon (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University)
  • 이한별 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 서현우 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 이주현 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소) ;
  • 박호원 (강릉원주대학교 치과대학 소아치과학교실 및 구강과학연구소)
  • Received : 2015.04.06
  • Accepted : 2015.06.24
  • Published : 2015.11.30
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Abstract

The aim of this study was to evaluate shear bond strength (SBS) of bulk-fill resin composites (RCs) to dentin and their micro-leakage. One high-viscosity bulk-fill RC and 2 low-viscosity bulk-fill RCs were compared with 1 conventional RC. 7thgenerationbondingagentswereused. In order to evaluate SBS values, 40 permanent molars were selected and divided into 4 groups. The bulk-fill RCs were applied in 4 mm thickness, whereas the conventional RC was applied in 2 mm thickness. In order to evaluate micro-leakage, class I cavities ($5{\times}2{\times}4mm$) were prepared in 32 permanent molars. The teeth were divided into 4 groups and restored with resin composites in an increment of 4 mm for the bulk-fill RC and in 2 horizontal increments of 2 mm for the conventional RC. The mean SBS value of conventional RC showed no statistically significant difference when compared with those of low-viscosity bulk-fill RCs. However, the mean SBS value of high-viscosity bulk-fill RC was significantly lower than that of conventional RC (p < 0.05). There were no statistically significant differences in micro-leakage between the 4 groups. For SBS and micro-leakage, the use of low-viscosity bulk-fill RCs might help clinicians simplify the procedure.

본 연구의 목적은 bulk-fill 복합레진의 상아질 전단결합강도 및 미세누출을 평가함에 있다. 실험군으로 1종의 고점도 bulk-fill 복합레진과 2종의 저점도 bulk-fill 복합레진을 사용하였고 대조군으로 1종의 conventional 복합레진을 사용하였다. 상아질 접착제는 7세대를 사용하였다. 영구치를 4군으로 나눈 후 전단결합강도 측정을 위해 레진블록을 실험군은 4 mm, 대조군은 2 mm 두께로 축조하였고, 미세누출을 평가를 위해 실험군은 4 mm 단일층 충전, 대조군은 2 mm씩 2회 적층충전을 시행하였다. 전단결합강도와 관련하여 대조군과 비교하였을 때 저점도 bulk-fill 복합레진에서는 통계적으로 유의한 차이가 존재하지 않았으나, 고점도 bulk-fill 복합레진에서는 유의하게 낮은 값이 관찰되었다(p < 0.05). 미세누출과 관련하여 4군 사이에 통계적으로 유의한 차이가 존재하지 않았다.

Keywords

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