Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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RHEOLOGICAL PROPERTIES OF RESIN COMPOSITES ACCORDING TO THE CHANGE OF MONOMER AND FILLER COMPOSITIONS

단량체 및 무기질 filler 조성 변화에 따른 복합레진의 유변학적 특성

  • Lee In-Bog (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Lee Jong-Hyuck (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Cho Byung-Hoon (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Son Ho-Hyun (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Lee Sang-Tag (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Um Chung-Moon (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
  • 이인복 (서울대학교 치과대학 치과보존학교실) ;
  • 이종혁 (서울대학교 치과대학 치과보존학교실) ;
  • 조병훈 (서울대학교 치과대학 치과보존학교실) ;
  • 손호현 (서울대학교 치과대학 치과보존학교실) ;
  • 이상탁 (서울대학교 치과대학 치과보존학교실) ;
  • 엄정문 (서울대학교 치고대학 치과보존학교실)
  • Published : 2004.11.01
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Abstract

The aim of this study was to investigate the effect of monomer and filler compositions on the rheological properties related to the handling characteristics of resin composites. Methods. Resin matrices that Bis-GMA as base monomer was blended with TEGDMA as diluent at various ratio were mixed with the Barium glass (0.7 um and 1.0 um), 0.04 um fumed silica and 0.5 um round silica. All used fillers were silane treated. In order to vary the viscosity of experimental composites, the type and content of incorporated fillers were changed, Using a rheometer, a steady shear test and a dynamic oscillatory shear test were used to evaluate the viscosity ($\eta$) of resin matrix, and the storage shear modulus (G'), the loss shear modulus (G"), the loss tangent ($tan{\delta}$) and the complex viscosity (${\eta}^*$) ofthe composites as a function of frequency ${\omega}{\;}={\;}0.1-100{\;}rad/s$. To investigate the effect of temperature on the viscosity of composites, a temperature sweep test was also undertaken. Results. Resin matrices were Newtonian fluid regardless of diluent concentration and all experimental composites exhibited pseudoplastic behavior with increasing shear rate. The viscosity of composites was exponentially increased with increasing filler volume%. In the same filler volume, the smaller the fillers were used, the higher the viscosities were. The effect of filler size on the viscosity was increased with increasing filler content. Increasing filler content reduced $tan{\delta}$ by increasing the G' further than the G". The viscosity of composites was decreased exponentially with increasing temperature.

Keywords

References

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