Restor Dent Endod.  2017 Nov;42(4):309-315. 10.5395/rde.2017.42.4.309.

Effect of water storage on flexural strength of silorane and methacrylate-based composite resins

Affiliations
  • 1Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran. mahsa.sheikh@gmail.com
  • 2Department of Periodontics, Mashhad University of Medical Sciences Faculty of Dentistry, Mashhad, Iran.

Abstract


OBJECTIVES
This study assessed the effect of water storage on the flexural strength (FS) of low shrinkage composites.
MATERIALS AND METHODS
A total of 165 bar-shaped specimens (2 × 2 × 25 mm) were fabricated of 2 low shrinkage composites (Filtek P90 [3M ESPE], GC Kalore [GC International]) and a conventional methacrylate-based composite (Filtek Z250 [3M ESPE]). The specimens were subjected to 3-point bending test at 6 time intervals, namely: immediately after curing, at 24 hours, 1 week, 1 month, 6 months, and 1 year following storage in wet and dry conditions. The FS of the specimens were measured by applying compressive load at a crosshead speed of 1.0 mm/min. Data was analyzed using 3-way analysis of variance (ANOVA) and Tukey's test.
RESULTS
Three-way ANOVA revealed significant interactions between time, type of composite, and storage condition (p = 0.001). Tukey's multiple comparison test revealed significant reductions in FS of all composites after 6 months and 1 year of storage in distilled water compared to dry condition.
CONCLUSIONS
Filtek P90 showed the highest and GC Kalore showed the lowest FS after 1 year storage in distilled water. The immediate high strength of Filtek Z250 significantly decreased at 1 year and its final value was lower than that of Filtek P90.

Keyword

Composite resins; Flexural strength; Polymers; Silorane resins; Water storage

MeSH Terms

Composite Resins*
Polymers
Silorane Resins*
Water*
Composite Resins
Polymers
Silorane Resins
Water

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