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KMID : 0362320090340020130
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Journal of Korean Academy of Operative Dentistry
2009 Volume.34 No. 2 p.130 ~ p.136
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SLUMPING TENDENCY AND RHEOLOGICAL PROPERTY OF FLOWABLE COMPOSITES
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Lee In-Bog
Min Sun-Hong
Kim Sun-Young
Cho Byung-Hoon
Baek Seung-Ho
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Abstract
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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℃ 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
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KEYWORD
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Slumping tendency, Rheological property, Flowable composite, Complex viscosity, Dynamic oscillatory shear test
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