@article{article_272635, title={Effect of ozone application on the shear bond strength of resin cements to nonvital bleached dentin}, journal={Selcuk Dental Journal}, volume={1}, pages={59–65}, year={2014}, DOI={10.15311/1441.272635}, author={Özçopur, Betül and Alkan, Özer and Eraslan, Öznur and Ayhan Alkan, Eylem and Eskitaşçıoğlu, Gürcan}, keywords={Nonvital bleached dentin, rezin siman, ozone, shear bond strength}, abstract={Background: The aim of this study was to evaluate the bond strengths of two resin based cements bonded to ozon-treated or non-treated nonvital bleached dentin.Methods: Eighty freshly extracted sound human maxillary incisor crowns were assigned to eight groups (n = 10): (G1, G2) bleached (10% carbamide peroxide, Opalescence Boost %38 Hydrogen peroxide) without or (G3,G4) with application of gaseous ozone (40%, 50 second, CR probe, Biozonix; High-Frequency Ozone Generator, Germany), (G5, G6) ozon treated without bleaching and (G7, G8) untreated control groups. The crowns were embedded in acrylic resin and dentin surfaces were exposed. Specimens were bonded with one of the two resin cements: Secure Cement (Sun Medical) (G1, G3, G5, G7); Clearfil Esthetic Cement (Kuraray) (G2, G4, G6, G8). 3 x 3 build-ups were created with the Resin cements and allowed to set (37ºC, 100% humid, 24 hrs) and then tested to failure for shear bond strength ( 0.5 mm/minute). The data was calculated as MPa and analyzed using Kruskal-Wallis test (P < 0.05).Results: Combination of ozone treatment and bleaching resulted in increased bond strength on both Secure cement (G3) and Clearfil Esthetic cement (G4) specimens (p > 0.05). Secure cement specimens treated with ozone (G5) demonstrated significantly lower shear bond strengths than G1, G3, and G7 (P < 0.05). Significant increase in shear bond strength was detected in Clearfil Esthetic cement group (G4) when compared to untreated control group (G8).Conclusion: Pretreatment with ozone prior to bonding procedure may decrease the effect of residual peroxide-induced reduction in resin bond strength. Thus, ozone application on nonvital bleached dentin surfaces can improve resin cement bonding to dentin surfaces.}, number={2}, publisher={Selcuk University}