Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites

Single-peak LED와 dual-peak LED의 출력 파장 차이가 복합 레진 미세 경도와 색 안정성에 미치는 영향

  • Park, Hye-Jung (Dept. of Conservative Dentistry, Pusan National University School of Dentistry) ;
  • Son, Sung-Ae (Dept. of Conservative Dentistry, Pusan National University School of Dentistry) ;
  • Hur, Bock (Dept. of Conservative Dentistry, Pusan National University School of Dentistry) ;
  • Kim, Hyeon-Cheol (Dept. of Conservative Dentistry, Pusan National University School of Dentistry) ;
  • Kwon, Yong-Hoon (Dept. of Dental Materials, Pusan National University School of Dentistry and Medical Research Institute) ;
  • Park, Jeong-Kil (Dept. of Conservative Dentistry, Pusan National University School of Dentistry)
  • 박혜정 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 손성애 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 허복 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 김현철 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 권용훈 (부산대학교 치의학전문대학원 치과재료학교실) ;
  • 박정길 (부산대학교 치의학전문대학원 치과보존학교실)
  • Received : 2010.09.21
  • Accepted : 2010.11.01
  • Published : 2011.03.31
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Abstract

Objectives: To determine the effect of the spectral output of single and dual-peak light emitting diode (LED) curing lights on the microhardness and color stability of commercial resin composites formulated with camphorquinone and alternative photoinitiators in combination. Materials and Methods: Three light-polymerized resin composites (Z100 (3M ESPE), Tetric Ceram (Ivoclar Vivadent) and Aelite LS Posterior (Bisco)) with different photoinitiator systems were used. The resin composites were packed into a Teflon mold (8 mm diameter and 2 mm thickness) on a cover glass. After packing the composites, they were light cured with single-peak and dual-peak LEDs. The Knoop microhardness (KHN) and color difference (${\Delta}E$) for 30 days were measured. The data was analyzed statistically using a student's t-test (p < 0.05). Results: All resin composites showed improved microhardness when a third-generation dual-peak LED light was used. The color stability was also higher for all resin composites with dual-peak LEDs. However, there was a significant difference only for Aelite LS Posterior. Conclusions: The dual-peak LEDs have a beneficial effect on the microhardness and color stability of resin composites formulated with a combination of camphorquinone and alternative photoinitiators.

연구목적: 여러 광개시제 시스템에 의해 활성화되는 복합 레진을 기존의 single-peak LED와 최신의 dual-peak LED로 광중합하였을 때의 누프 미세 경도와 수중 보관 후의 색 안정성 차이를 알아보기 위한 것이다. 연구 재료 및 방법: Camphorquinone이 광개시제로 포함되어 있는 Z100과 다른 광개시제가 포함되어 있는 것으로 알려진 Tetric Ceram과 Aelite LS Posterior를 유리판 위에서 테플론 주형(직경 8 mm, 두께 2 mm) 내로 충전하고, single-peak LED와 dual-peak LED로 광중합하였다. 중합 후 누프 미세 경도를 측정하였고 한 달 후 색 변화를 측정하였다. 광중합기간의 미세 경도와 색 변화 차이를 student t-test로 분석하였다. 결과: 모든 레진에서 dual-peak LED로 광중합하였을 때 미세 경도가 높게 나타났다. 색 안정성 역시 dual-peak LED로 광중합하였을 때 높게 나타났으나 Aelite LS Posterior에서만 통계학적으로 유의한 차이가 있었다. 결론: 다른 광개시제가 포함되어 있는 복합 레진을 dual-peak LED로 광중합한 경우 미세 경도와 색 안정성에 있어서 더 좋은 결과를 얻을 수 있었다.

Keywords

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