J Korean Acad Conserv Dent.  2009 Mar;34(2):130-136. 10.5395/JKACD.2009.34.2.130.

Slumping tendency and rheological property of flowable composites

• Lee IB
• Min SH
• Kim SY
• Cho BH
• Back SH

• KMID: 2294354
• DOI: http://doi.org/10.5395/JKACD.2009.34.2.130

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 25degrees 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 < FF < DF < TF < RV). 2. Flowable composites exhibited pseudoplasticity in which the complex viscosity decreased with increasing frequency (shear rate). AF was the most significant, RV the least. 3. The slumping tendency was strongly related with the complex viscosity. Slumping resistance increased with increasing the complex viscosity. The slumping tendency could be quantified by measuring the aspect ratio of slumped flowable composites. This method may be applicable to evaluate the clinical handling characteristics of flowable composites.

Keyword

Slumping tendency; Rheological property; Flowable composite; Complex viscosity; Dynamic oscillatory shear test

MeSH Terms

Composite Resins
Glass
Handling (Psychology)
Light
Syringes
Viscosity
Composite Resins

Figure

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  Figure 1 Schematic diagram of composite loading device.

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  Figure 2 a) Lateral view of cured flowable composites after slumping for 10 s at 25℃. b) Aspect ratio (height/base diameter) of cured slumped composite was measured to compare the slumping tendency among composites.

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  Figure 3 Aspect ratio of slumped flowable composites. Higher aspect ratio means that the material has higher slumping resistance.

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  Figure 4 Representative curves of complex viscosity of composites as a function of angular frequency in a dynamic oscillatory shear - frequency sweep test. The viscosity very rapidly decreased with increasing frequency (a: logarithmic plot, b: linear plot).

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  Figure 5 Regression analysis showed that the aspect ratio of composites as a function of complex viscosity η*ω=0.1 rad/s is well fitted to a nonlinear curve y=ln(a+bx)(y: aspect ratio, x: complex viscosity η*) (R=0.978).

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