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J Esthet Restor Dent. 2015 Sep-Oct;27(5):300-6. doi: 10.1111/jerd.12119. Epub 2014 Aug 21.

Water Sorption, Solubility, and Color Stability of Giomer Restoratives.

Author information

1
Department of Restorative Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey.
2
Department of Pediatric Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey.

Abstract

OBJECTIVES:

This study compared the color stability, water sorption, and solubility of a giomer composite and two nanohybrid composite resins.

MATERIALS AND METHODS:

Disc-shaped specimens (1-mm thickness × 15-mm diameter) of a giomer (Beautifil II, Shofu, Kyoto, Japan) and two nanohybrid (Filtek Z550, 3M ESPE, St. Paul, MN, USA; Tetric N-Ceram, Ivoclar Vivadent, Schaan, Liechtenstein) composites (N = 10) were prepared. Baseline color measurements were taken, and specimens were immersed in water for 28 days. Following immersion, color values were remeasured, and color-change values (ΔE) were calculated. Water sorption and solubility were assessed by mass gain or loss after storage in water for 28 days. Data were analyzed with one-way analysis of variance and Tukey's post-hoc tests (p = 0.05). Pearson's correlation test was used to assess possible correlations between water sorption and solubility, water sorption and color stability, and solubility and color stability (p = 0.05).

RESULTS:

Water sorbtion (%) and color change (ΔE) varied significantly among groups, with Beautifil II exhibiting the highest values (p < 0.001). No statistically significant differences were observed in water solubility values among the groups (p = 0.661); however, a linear, positive correlation was detected between solubility and discoloration (r = 0.368, p = 0.046).

CONCLUSION:

Water sorption and discoloration values of the giomer composite group were significantly higher than those of the nanohybrids tested.

CLINICAL SIGNIFICANCE:

The high levels of water sorption and discoloration of giomer composites are likely to have an adverse effect on esthetic restorations.

PMID:
25145876
DOI:
10.1111/jerd.12119
[Indexed for MEDLINE]

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