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Slumping resistance and viscoelasticity prior to setting of dental composites
InBog Lee1, Juhea Chang, Jack Ferracane
1Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, 28-2 Yeongeon-Dong, Jongro-Ku, Seoul 110-749, South Korea. inboglee@snu.ac.kr
Objectives:
The aim of this study was to develop a method for measuring the slumping resistance of resin composites and to evaluate the efficacy using rheological methodology.
Methods:
Two commercial hybrid composites (Z100 and Z250) and a nanofill composite (Z350) were used to make disc-shaped specimens of 2mm thickness. Three kinds of aluminum molds with triangular, circular, and square shaped cutting surfaces were pressed onto the resin discs to make standardized imprints. The imprints were light-cured either immediately (non-slumped) or after waiting for 2min at 25 degrees C (slumped). White stone replicas were made and then scanned for topography using a laser 3-D profilometer. Slumping resistance index (SRI) was defined as the ratio of the groove depth of the slumped specimen to that of the non-slumped specimen. The pre-cure viscoelasticity of each composite was evaluated by an oscillatory shear test and normal stress was measured by a squeeze test using a rheometer. Correlation analysis was performed to investigate the relationship between the viscoelastic properties and SRI.
Results:
SRI varied between the three materials (Z100
Significance:
Slumping tendency could be quantified using the imprint method and SRI. The index may be applicable to evaluate the clinical handling characteristics of composites.
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