Performance of the experimental resins and dental nanocomposites at varying deformation rates
Version of Record online: 14 JUN 2013
© 2013 Wiley Publishing Asia Pty Ltd
Journal of Investigative and Clinical Dentistry
Volume 5, Issue 3, pages 237–242, August 2014
How to Cite
Kumar, N. and Shortall, A. (2014), Performance of the experimental resins and dental nanocomposites at varying deformation rates. Journal of Investigative and Clinical Dentistry, 5: 237–242. doi: 10.1111/jicd.12043
- Issue online: 6 AUG 2014
- Version of Record online: 14 JUN 2013
- Manuscript Accepted: 3 FEB 2013
- Manuscript Received: 29 DEC 2012
- bi-axial flexure strength;
- deformation rate;
- resin-based composite;
- storage regime;
- unfilled resin
The aim of the present study was to evaluate the bi-axial flexural strength of experimental unfilled resins and resin-based composites at varying deformation rates following 1-week dry, 1-week wet, and 13-week wet storage regimes.
A total of 270 disc-shaped specimens (12 mm diameter, 1 mm thickness) of either unfilled resins or experimental resin-based composites comprising of three groups (n = 90) were fabricated. Three groups of each unfilled resin and resin-based composites (n = 90) were stored for 1 week under dry conditions, and at 1 and 13 weeks under wet conditions (37 ± 1°C) before testing. The bi-axial flexural strength of each unfilled resin and resin-based composites group was determined at a 0.1, 1, and 10 mm/min deformation rate (n = 30).
The unfilled resins revealed a deformation rate dependence following all storage regimes; however, the addition of fillers in the unfilled resins modified such reliance following the 1-week dry and 13-week wet storage regimes. In contrast, a lower bi-axial flexural strength of the 1-week wet resin-based composites specimens at a 0.1 mm/min deformation rate was identified.
A lower bi-axial flexural strength of the 1-week wet resin-based composites specimens at a low deformation rate suggests that premature failure of resin-based composites restorations might occur in patients with parafunctional habits, such as bruxism.