Effect of water storage on flexural strength of silorane and methacrylate-based composite resins.
10.5395/rde.2017.42.4.309
- Author:
Narges PANAHANDEH
1
;
Hassan TORABZADEH
;
Hani NADERI
;
Seyedeh Mahsa SHEIKH-AL-ESLAMIAN
Author Information
1. Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran. mahsa.sheikh@gmail.com
- Publication Type:Original Article
- Keywords:
Composite resins;
Flexural strength;
Polymers;
Silorane resins;
Water storage
- MeSH:
Composite Resins*;
Polymers;
Silorane Resins*;
Water*
- From:Restorative Dentistry & Endodontics
2017;42(4):309-315
- CountryRepublic of Korea
- Language:English
-
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.
