Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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SLUMPING TENDENCY AND RHEOLOGICAL PROPERTY OF FLOWABLE COMPOSITES

Flowable 복합레진의 slumping 경향과 유변학적 성질

  • Lee, In-Bog (Department of Conservative Dentistry, School of Dentistry, Seoul National University) ;
  • Min, Sun-Hong (Department of Conservative Dentistry, School of Dentistry, Seoul National University) ;
  • Kim, Sun-Young (Department of Conservative Dentistry, School of Dentistry, Seoul National University) ;
  • Cho, Byung-Hoon (Department of Conservative Dentistry, School of Dentistry, Seoul National University) ;
  • Back, Seung-Ho (Department of Conservative Dentistry, School of Dentistry, Seoul National University)
  • 이인복 (치과보존학교실, 서울대학교 치의학대학원) ;
  • 민선홍 (치과보존학교실, 서울대학교 치의학대학원) ;
  • 김선영 (치과보존학교실, 서울대학교 치의학대학원) ;
  • 조병훈 (치과보존학교실, 서울대학교 치의학대학원) ;
  • 백승호 (치과보존학교실, 서울대학교 치의학대학원)
  • Published : 2009.03.31
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Abstract

The aim of this study was to develop a method for measuring the slumping resistance of flowable resin composites and to evaluate the efficacy using rheological methodology. Five commercial flowable composites (Aelitefil flow:AF, Filtek flow:FF, DenFil flow:DF, Tetric flow:TF and Revolution:RV) were used. Same volume of composites in a syringe was extruded on a glass slide using a custom-made loading device. The resin composites were allowed to slump for 10 seconds at $25^{\circ}C$ and light cured. The aspect ratio (height/diameter) of cone or dome shaped specimen was measured for estimating the slumping tendency of composites. The complex viscosity of each composite was measured by a dynamic oscillatory shear test as a function of angular frequency using a rheometer. To compare the slumping tendency of composites, one way-ANOVA and Turkey's post hoc test was performed for the aspect ratio at 95% confidence level. Regression analysis was performed to investigate the relationship between the complex viscosity and the aspect ratio. The results were as follows. 1. Slumping tendency based on the aspect ratio varied among the five materials (AF

본 연구의 목적은 flowable 복합레진의 조작성과 큰 연관이 있는 slumping 경향을 측정하는 방법을 제시하고 이와 관련이 있는 복합레진의 유변학적 특성을 고찰하였다. 5 종의 flowable 복합레진 (Aelitefil flow:AF, Filtek flow:FF, DenFil flow:DF, Tetric flow:TF and Revolution:RV)이 사용되었다. 주사기에 담긴 일정량의 복합레진을 일정 한 속도로 가압할 수 있는 장치를 이용하여 슬라이드글라스 위에 사출 한 후 $25^{\circ}C$의 실온에서 10 초 동안 slumping이 일어나도록 방치한 후 광중합 하였다. 복합레진의 slumping경향을 평가하기 위해 원뿔 형 혹은 동형으로 경화된 시편의 aspect ratio (밑면의 지름에 대한 높이의 비)를 구하였다. Slumping 경향과 복합레진의 유변학적 성질과의 관련성을 알아보기 위해 Rheometer를 사용하여 각진동수 ${\omega}=0.1-100$ rad/s의 범위에서 동적진동전단시험을 시행하여 복합레진의 복소점도를 구하였다. 복합레진의 slumping경향을 비교하기 위해 일원분산분석 및 Turkey's post test를 시행하였고 (${\alpha}<0.05$), 복소점도와 aspect ratio사이의 관련성을 알아보기 위해 회귀분석을 시행하였다 결과는 다음과 같다. 1. Slumping 후 aspect ratio를 측정하여 비교한 flowable 복합레진의 slumping 경향은 제품에 따라 큰 차이를 보였다(AF

Keywords

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