발광 다이오드 광중합기의 복합레진 중합 평가
Evaluation of New LED Curing Light on Resin Composite Polymerization
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초록
최근 도입된 광범위 스펙트럼의 발광 다이오드 광중합기는 4개의 램프로 구성되어 있으며 다양한 중합 모드를 가지고 있다. 이 연구는 광범위 스펙트럼 발광 다이오드(VALOⓇ, Ultradent, USA) 광중합기와 기존의 발광 다이오드 광중합기(EliparTM Freelight 2, 3M ESPE, USA)의 효율을 미세경도 시험을 통해 비교하였다. 연구에 사용한 광중합기는 VALOⓇ와 EliparTM Freelight 2이며 중합 시간은 제조사의 지시에 따랐다. 37℃의 생리식염수에 중합된 레진 시편을 24시간 동안 보관한 후 미세경도 시험을 시행하였다. 시편 상부와 하부의 복합레진 미세경도는 공분산분석을 시행하였다. 광범위 스펙트럼의 발광 다이오드 광중합기를 이용하여 고성능 모드에서 4초, 플라즈마 모드에서 20초 광중합을 실시한복합레진 시편의 상부는 기존의 발광 다이오드 광중합기에 비해 미세경도가 증가하였으나(p < 0.05), 시편의 하부에서는 실험에 사용된 광중합기 간에 유의성 있는 차이를 보이지 않았다.
Abstract
The purpose of this study is to compare efficiency of broad spectrum LEDs (VALOⓇ, Ultradent, USA) withconventional LED curing lights (EliparTM Freelight 2, 3M ESPE, USA) using a microhardness test. The light curing units used were VALOⓇ in three different modes and EliparTM Freelight 2. The exposure timewas used according to the manufacturer's instructions. After cured resin specimens were stored in physiologicalsaline at 37℃ for 24 hours, microhardness was measured using Vickers microhardness tester. The microhardnessof upper and lower sides of the specimens were analyzed separately by the ANOVA method (Analysis ofVariance) with a significance level set at 5%. At upper side of resin specimens, an increased microhardness was observed in the broad spectrum LED curinglight unit with a high power mode for 4 seconds and plasma emulation mode for 20 seconds (p < 0.05). However, at the lower side of resin specimens, there were no significant differences in microhardness betweenbroad spectrum LED curing light unit and conventional LED curing light unit.
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