Farklı asitleme işlemlerinin lityum disilikat seramiklerin yüzey pürüzlülüğü ve bağlanma dayanımı üzerine etkisi

Amaç: Bu çalışmanın amacı hidroflorik (Hf) asit ve ısıyla uygulanan deneysel sıcak asit ile pürüzlendirilmiş lityum disilikat seramiklerin rezin siman ile mikro gerilim bağlanma dayanımlarını değerlendirmektir. Gereç ve yöntem: Bu çalışmada 24 adet çürüksüz insan üçüncü molar diş kullanıldı. Dişler akrilik rezin bloklara mine-sement sınırının 2 mm aşağısında olacak şekilde gömüldü. Dişler üzerinde parallelometre yardımıyla sınıf I inley kaviteler açıldı. Lityum disilikat seramik restorasyonlar üretici firma talimatına göre üretildi. Örnekler 2 gruba ayrıldı. 1) % 9’luk Hf asit 20 sn, 2) deneysel sıcak asit 30 dk. Seramik yüzeylerin yüzey pürüzlülüğü AFM altında değerlendirildi (n=12). Dual şertleşen rezin siman ile simantasyondan sonra örnekler termal siklusa (5000 siklus) tabi tutuldu ardından elmas separe ile seramik ve dişten oluşan 1.2 mm2 ’lik mikrobarlar elde edildi. Her grup için her dişten en uygun iki mikrobar mikrogerilim testi için kullanıldı (n=24). Sonrasında örneklere 1 mm/dk hızla mikro gerilim bağlanma testi uygulandı. Elde edilen değerlere bağımsız örneklem T testi yapıldı (P=0.05). Yüzey pürüzlülüğü ve mikro gerilim bağlanma değerleri arasındaki ilişkiyi analiz etmek amacıyla Pearson korelasyon katsayısıyla korelasyon testi yapıldı (P=0.01). Bulgular: Deneysel sıcak asit uygulanan grubun ortalama değerleri Hf asit uygulanan gruptan istatistiksel olarak anlamlı derecede düşüktür (P

Effects of different etching processes on surface roughness and bond strength of lithium disilicate ceramic systems

Background: The aim of this study was to evaluate the microtensile bond strengths of resin cement, and lithium disilicate ceramics etched with hydrofluouric (Hf) acid and experimental hot etching acid. Methods: In this study, 24 non-carious human third molar teeth were used. Teeth were embedded in chemically cured acrylic resin blocks up to 2 mm below the cemento-enamel junction. Class I inlay cavity was prepared using a milling machine. Lithium disilicate restorations were prepared to manufacturer’ s instructions. Specimens were divided into 2 groups. 1) etched with % 9 Hf (20 sec), 2) experimental hot etching (30 min). Ceramic surfaces were evaluated under an AFM (n=12). After dual cure resin cement cementation process, the specimens were thermal cycled (5000 cycles). The top half consisting of ceramic and the bottom half consisting of dentin microbars were sectioned into 1.2 mm2 wide sections. For each group most suitable 2 microbars were used for microtensile test (n=24). Then 1mm/min speed microtensile bond strength test was applied. Sample T-test was used to analyze surface roughness and microtensile bond strength values of variance (P=0.05). Correlation test was used to analyze relationship between the Surface roughness and microtensile bond strength values (P=0.01). Results: Mean values of experimental hot acid treated group were significantly lower than Hf acid treated group (P

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