Betül ÖZÇOPUR, ÖZER ALKAN, Öznur ERASLAN, EYLEM AYHAN ALKAN, Gürcan ESKİTAŞCIOĞLU

Ozon uygulamasının devital ağartma yapılan dentinde rezin simanın shear bağlanmadayanımına etkisi

Amaç: Ozon uygulanan ve uygulanmayan devital ağartma yapılmış dentine iki rezin simanın bağlanma dayanımının incelenmesi Gereç ve Yöntemler: : Seksen yeni çekilmiş sağlam insan maksiller kesici kuronları sekiz gruba ayrıldı (n=10): (G1, G2). Ağartmayı takiben ozon uygulanmayan (10% carbamide peroxide, Opalescence Boost %38 Hydrogen peroxide) veya uygulanan gruplar (G3, G4) (40%, 50 second, CR probe, Biozonix; High-Frequency Ozone Generator, Germany), ozonun ağartma yapılmadan uygulandığı gruplar (G5, G6) ve herhangi bir işlem uygulanmayan kontrol grupları (G7, G8). Kuronlar akrilik rezin içine dentin yüzeyleri açıkta kalacak şekilde yerleştirildi. Örneklerde iki rezin simandan biri kullanıldı: Secure Cement (Sun Medical) (G1, G3, G5, G7); Clearfil Esthetic Cement (Kuraray) (G2, G4, G6, G8). 3 x 3 boyutunda rezin siman oluturulan gruplar setleşme süresinden (37ºC, 100% nemli, 24 saat) sonra shear bağlanma dayanımı ile test edildi ( 0.5 mm/minute). Veriler MPa olarak hesaplandı ve Kruskal-Wallis testi ile analizler yapıldı (P < 0.05). Bulgular: Ağartma işleminin ozon uygulaması ile kombine kullanımı hem Secure siman (G3) hem de Clearfil Esthetic simanın (G4) bağlanma dayanımını artırdı (p > 0.05). Ozon uygulanan Secure siman örnekleri (G5), G1, G3, ve G7 gruplarından anlamlı derecede daha düşük bağlanma dayanımı gösterdi (P < 0.05). Clearfil Esthetic siman grubu (G4) kontrol grubundan (G8) anlamlı derecede daha yüksek bağlanma dayanımı gösterdi. Sonuç: Bonding işlemleri öncesinde ozon uygulaması ağartma sonrası geride kalan peroksitin etkisini azaltabilir. Devital ağartma sonrası ozon uygulaması rezin simanın dentin yüzeyine bağlantısını artırabilir.

Effect of ozone application on the shear bond strength of resin cements to nonvital bleached dentin

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.

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