Effect of external tooth bleaching on the surface of resin composites – An in vitro study
| Autor: | Manuela Lopes, Catarina Coito, Helena Maria Gorgulho Pitacas, Alexandre Cavalheiro, Ana Maria Silva, Raquel Eira |
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| Rok vydání: | 2015 |
| Předmět: |
Tooth whitening
Branqueamento dentário Surface analysis Materials science Restaurações dentárias Scanning electron microscope business.industry Resin composite Composite number Sem analysis Dentistry Composite Análise de superfície Dental restorations Silicon mold Distilled water Compósito In vitro study Surgery Tooth whitening/bleaching business General Dentistry Nuclear chemistry |
| Zdroj: | Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurgia Maxilofacial. 56(3):149-155 |
| ISSN: | 1646-2890 |
| DOI: | 10.1016/j.rpemd.2015.08.002 |
| Popis: | Objectives To evaluate the effects of external tooth whitening on the surface of two types of resin composites, by scanning electron microscopy (SEM). Methods Eighteen (N = 18) specimens were assigned into six groups using two composites: a nanohybrid (Tetric EvoCeram®) and a nanofill (Filtek Supreme XT®); and three protocols: 10% carbamide peroxide (CP) whitening (TW10 and FW10); 22% CP whitening (TW22 and FW22); control group (TC and FC). For each group, the resin composite was introduced into a silicon mold and light-cured according to manufacturer's instructions. Specimens were stored in distilled water (37 °C, 24 h), polished, and then randomly divided into the mentioned groups. Specimens from the whitening groups were exposed to the CP gels (White Dental Beauty®) for 6 h per day. TC and FC specimens were exposed to distilled water. All specimens were stored in an incubator (37 °C, 14 days) and observed by SEM. It was measured the hydrogenionic potential (pH) of the CP gels. Results SEM analysis of both composites exposed to the CP gels showed surface changes, namely superficial cracks and numerous porous, highlighting a real separation between the resin matrix and the composite fillers, regardless of the gel concentration. These changes were more notorious in the nanohybrid composite. 10% and 22% CP gels have a pH value of 6.71 and 7.42, respectively. Conclusion The 10% and 22% CP led to changes on both surface composites. These alterations are pronounced in the nanohybrid composite and are independent of the concentrations used. |
| Databáze: | OpenAIRE |
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