Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547

This article has now been updated. Please use the final version.

Rheological approach for determining yield stresses in flowable resin composites prior to setting
Masaki ASAKURATatsuhide HAYASHIShozo TSURUTAMitsunori YAMAMOTOShuichiro KOBAYASHIAkimichi MIEKITatsushi KAWAI
Author information
JOURNAL FREE ACCESS Advance online publication

Article ID: 2016-164

Details
Abstract

The purpose of this study is to develop a method for quantifying the fluidity of flowable resin composites using determinations of yield stress. Five commercially available composites (AliteFlo LV, Flow-it ALC, Venus flow, Tetric N-flow, Revolution Formula2) were investigated. Yield stress values were obtained by plotting shear stresses for a range of shear rates, followed by fitting of Casson fluid models to flow curve data and extrapolation to the stress axis. To confirm that yield stress reflected fluidity, apparent viscosity at the lower shear rate (0.2 s−1) was calculated from flow curves. Yield stresses ranged from 5.4 to 43.1 Pa, and were found to capture differences in the fluidity of composites that were not captured by viscosity measurement at the low shear rate. Yield stress is directly proportional to fluidity, and could serve as a simple and precise indicator for selecting flowable resin composites for use in various clinical applications.

Content from these authors
© 2017 The Japanese Society for Dental Materials and Devices
feedback
Top