Effect of water storage on flexural strength of silorane and methacrylate-based composite resins
Panahandeh Narges, Torabzadeh Hassan, Naderi Hani, Sheikh-Al-Eslamian Seyedeh Mahsa,
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( Panahandeh Narges ) - Shahid Beheshti University of Medical Sciences Research Institute of Dental Sciences Dental Research Center
( Torabzadeh Hassan ) - Shahid Beheshti University of Medical Sciences Research Institute of Dental Sciences Dental Research Center
( Naderi Hani ) - Mashhad University of Medical Sciences Faculty of Dentistry Department of Periodontics
( Sheikh-Al-Eslamian Seyedeh Mahsa ) - Shahid Beheshti University of Medical Sciences Research Institute of Dental Sciences Dental Research Center
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.
키워드
Composite resins; Flexural strength; Polymers; Silorane resins; Water storage
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