Hygroscopic/Hydrolytic Kinetics of Two Bulk-fill Resin Composite Restorative Materials Stored in Different Media: An inVitro Comparative Study | ||||
| Egyptian Dental Journal | ||||
| Article 30, Volume 64, Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), October 2018, Page 3823-3831 PDF (382.53 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2018.79357 | ||||
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| Author | ||||
| Nadia M. Zaghloul | ||||
| Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Mansoura University. | ||||
| Abstract | ||||
| Objectives: The aim of this study was to determine the effect of different storage media on Sorption/solubility kinetics of two bulk-fill resin composites, Venus bulk fill flowable resin composite (VF) and Sonic Fill bulk fill resin composite (SF), stored in different media (alkaline water Aw, 75% ethyl alcohol EA and lemon juice LJ). Materials and Methods: One hundred and twenty disc specimens were fabricated and divided into two main groups (n=60) involve two bulk-fill resin composites, depending on their low viscosity. The specimens in each group were divided into three subgroups according to the storage media (n=20) i.e. alkaline drinking water, 75% ethyl alcohol and lemon juice. All specimens were desiccated before storage to obtain a constant mass (m1) and volume (V) in mm3. Specimens were subjected to 4 weeks immersion, then dried and reweighed again to obtain (m2). The specimens were desiccated again to obtain constant mass (m3). Sorption and solubility’s properties’ in water were calculated according to proposed formula by ISO 4049- 2009. Results: Two-way ANOVA indicated significant difference in sorption and solubility kinetics for both factors, resin composites and immersion media (p<0.05). Tukey’s test showed that VF significantly absorb fluids than SF, regardless the storage media. The mean weight changes in the VF resin composite showed increasing fluid sorption after storage in AW, EA and LJ. There were significant differences between either AW or EA and LJ. For SF, fluid sorption is increased from AW, followed by EA and LJ. Solubility of VF was significantly higher than SF, when stored in each immersion medium. The mean weight loss in the VF resin composite showed insignificant increasing solubility after immersion in AW , LJ and EA. The mean weight loss for SF revealed increasing solubility after immersion in AW, LJ and EA. VF revealed higher significant fluid solubility when stored in water, than in EA or LJ. EA cause significantly higher solubility of SF resin composite, than AW or LJ storage media, Conclusions: Within the conditions of this in-vitro study, the following conclusions were drawn: The sorption and solubility behaviour of the resin composites is material dependent, as Venus flow bulk-fill resin composite tested in this study showed higher fluids sorption/solubility tendency than that of Sonicfill bulk-fill resin composite. Regarding to the storage media, pH of the solutions seems to have an influence on the sorption/solubility behavior of composite resin materials. Both acidic and alkaline media increase sorption/solubility behaviour of the resin composites. | ||||
| Keywords | ||||
| Bulk-Fill resin composite; storage media; Sorption/solubility behavior | ||||
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