Characterization of water sorption, solubility and filler particles of light-cured composite resins

Abstract

The goals of this study were to measure the water sorption (WS) and solubility (SO) of 3 composite resins containing different filler contents. Additionally, the size, shape, type and other characteristics of fillers were analyzed by scanning electron microscopy (SEM). Three composites, classified according to filler size, were selected: Filtek Supreme nanofill (3M/ESPE), Esthet-X minifill (Dentsply/Caulk) and Renamel microfill (Cosmedent Inc.). Ten disk-shaped specimens of each resin composite were made and stored in desiccators until constant mass was achieved. Specimens were then stored in water for 7 days, and the mass of each specimen was measured. The specimens were dried again and dried specimen mass determined. The WS and SO were calculated from these measurements. Data analyzed by one-way ANOVA and Tukey's post-hoc test (alpha=0.05). Composite filler particles were observed under SEM after removal of resin matrix by organic solvents. WS values were not significantly different among the resins; however, SO values were lower for Filtek Supreme. The materials presented differences in filler contents (e.g. particle size and shape). The composite resins had similar WS, while the SO was lower for the nanofill than for mini and microfill resins. The filler characteristics varied and were different among the materials.

Water sorption and solubility of core build-up materials

“…In this study Grandio Core had a significantly lower water sorption and solubility than the other materials that may be due to a more cross-linked polymer network. Filler content is believed to affect the solubility of resin-composites [24] that is in agreement with our study as there was a strong positive correlation between filler loading and sorption and solubility for Grandio Core, Core.X Flow and Bright Flow Core.…”

Addition of silver nanoparticles reduces the wettability of methacrylate and silorane-based composites

“…There is also a correlation between filler load and water sorption. 19 The flowable composite used in the study of Bürgers et al (X-flow) contains 38% by volume silicon dioxide filler particles, whereas the Z250 composite is filled to 60% by volume with zirconia/silica particles, and Filtek Silorane contains 76% by volume quartz and yttrium fluoride filler particles. The contact angle of the flowable composite used in the study of Bürg-ers et al 11 was 66°, which increased upon the addition of silver particles.…”

Monomers used in resin composites: degree of conversion, mechanical properties and water sorption/solubility

“…Also, the filler bonding agent can also degrade (10). All these factors together cause material degradation, with significant decrease of mechanical properties, ultimately leading to restoration failure (11).…”