Monomer release from nanofilled and microhybrid dental composites after bleaching.

Autor:	Tabatabaee MH; Associate Professor, Dental Research Center Dentistry Research Institute, Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran., Arami S; Assistant Professor, Department of Operative Dentistry, School of Dentistry Tehran University of Medical Sciences, Tehran, Iran., Ghavam M; Associate Professor, Dental Research Center Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran., Rezaii A; Dentist.
Jazyk:	angličtina
Zdroj:	Journal of dentistry (Tehran, Iran) [J Dent (Tehran)] 2014 Jan; Vol. 11 (1), pp. 56-66. Date of Electronic Publication: 2014 Jan 31.
Abstrakt:	Objective: The aim of this study was to assess the effect of bleaching on elution of monomers from nanofilled and microhybrid composites. Materials and Methods: 80 samples (5mm diameter and 3mm thickness) of each composite were prepared. After curing, half of them were randomly polished. Each group was divided into 8 subgroups and immersed in water or 10%, 20% and 30% H2O2 for 3 or 8 hours. Eluted Bis-GMA (Bis-phenol A Glycidyl Dimethacrylate), TEGDMA (Triethyleneglycol Dimethacrylate), UDMA (Urethane Dimethacrylate) and BisEMA (Bis-phenol A ethoxylate Dimethacrylate) were quantified by high performance liquid chromatography and the results were analyzed by univariate ANOVA and t-test (P<0.05). Results: Bleach significantly increased the overall release of monomers (P<0.001); TEGDMA was released more than Bis-GMA (P<0.001). Supreme released more TEGDMA compared to Z250 (P<0.001). Bleaching increased the release of this monomer (P<0.001). Increasing both the concentration of H2O2, and the immersion time, increased the release of TEGDMA (P<0.001). Polishing had no effect on release of this monomer (P=0.952). Supreme released more Bis-GMA than Z250 (P=0.000). The more concentrated H2O2 caused more elution of Bis-GMA (P= 0.003); while the effect of immersion time was not significant (P=0.824). Polishing increased the release of Bis-GMA (P=0.001). Neither the type of composite nor Bleaching had any effect on release of UDMA (P=0.972) and (P=0.811) respectively. Immersion duration increased the release of UDMA (P=0.002), as well as polishing (P=0.024). Conclusion: Bleaching increased the release of monomers. Nanofilled composites released more monomer than the microfilled.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu