Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Optical characteristics of resin composite before and after polymerization

광중합 전후 복합레진의 광학적 특성

  • Eom, Ah-Hyang (Department of Conservative Dentistry, Graduate of Kyung Hee University) ;
  • Kim, Duck-Su (Department of Conservative Dentistry, Graduate of Kyung Hee University) ;
  • Lee, Soo-Hee (Department of Conservative Dentistry, Graduate of Kyung Hee University) ;
  • Byun, Chang-Won (Department of Conservative Dentistry, Graduate of Kyung Hee University) ;
  • Park, Noh-Hoon (Department of Conservative Dentistry, Graduate of Kyung Hee University) ;
  • Choi, Kyoung-Kyu (Department of Conservative Dentistry, Graduate of Kyung Hee University)
  • 엄아향 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 김덕수 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 이수희 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 변창원 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 박노훈 (경희대학교 대학원 치의학과 치과보존학교실) ;
  • 최경규 (경희대학교 대학원 치의학과 치과보존학교실)
  • Received : 2011.03.30
  • Accepted : 2011.05.06
  • Published : 2011.05.31
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Abstract

Objectives: The aim of this study was to evaluate the optical characteristics such as color and translucency changes before and after light curing, to quantify the CQ and to measure refractive indices of body and opaque shade of resin composites materials. Materials and Methods: Resin composites used in this study were A2 body and A2 opaque shade of Esthet-X, Filtek supreme, Gradia Direct, Clearfil Majesty and Beautifil II. Color and translucency changes before and after light curing were evaluated by colorimeter, the CQ was quantified by GC-MS and refractive index changes were measured by spectroscopic ellipsometer. Results: Translucency parameter (TP) was significantly increased after curing. The CQ content of body shades are higher than that of opaque shades in all resin composites. Refractive index increased after polymerization in all materials and significant difference in ${\Delta}$refractive index was found between body and opaque shade (significance level 0.05). Conclusions: For an accurate shade match, direct shade matching of resin composite should be performed by using the cured material.

연구목적: 복합레진의 광중합 전후에 일어나는 색과 투명도 변화를 측정하고, CQ의 함량을 정량하였으며, 광중합 전후 복합 레진의 굴절률을 측정해 이들의 상관 관계를 알아보고자 하였다. 연구 재료 및 방법: Esthet-X, Filtek supreme, Gradia Direct, Clearfil Majesty, Beautifil II에 대하여 Colorimeter NF999를 이용하여 광중합 전후의 색과 투명도를 각각 측정하고, GC-MS를 이용해 각 복합레진의 CQ 함량을 측정하였으며, spectroscopic ellipsometer를 이용해 광중합 전후의 굴절률을 측정하였다. 결과: 투명도는 광중합 후에 증가하였고, body shade에서 opaque shade보다 투명도 차이가 크게 나타났다. 모든 레진에서 body shade의 CQ 함량이 opaque shade의 CQ 함량보다 높았다. 굴절률은 광중합 후에 모든 레진에서 증가하였으며, body shade와 opaque shade간에 굴절률의 변화는 유의한 차이가 있었다. 결론: 광중합 후에는 복합레진의 색과 투명도가 상당한 차이를 나타낸다. 따라서 임상에서 direct shade matching을 시행할 때는 중합된 레진을 사용하여야 한다.

Keywords

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