Amaç: Bu in vitro çalışmada; yüzey işlemlerinin, farklı ışık geçirgenlik özellikleriyle karakterize edilmiş olan yeni geliştirilen zirkonya seramiklerin rezin siman ile olan bağlantısına etkisinin değerlendirilmesi amaçlanmıştır. Gereç ve Yöntemler: Üç farklı zirkonya bloktan [Vita YZ HT (HT), Vita YZ ST (ST) ve Vita YZ XT (XT)] 15,0 mm çapında ve 3.0 mm kalınlığında 96 örnek hazırlandı. Örnekler dört alt gruba ayrıldı (n=8). Bunlar; kontrol (A), kumlama (B), glazür+HF asit uygulaması (C) ve zirkonya primer (D)'dir. Örneklerin makaslama bağlanma dayanımı, universal test cihazında 0,5 mm/dk hız ile test edildi. Elde edilen veriler iki yönlü varyans analizi ve Tukey HSD post hoc testi kullanılarak istatistiksel olarak karşılaştırıldı. İstatistiksel anlamlılık düzeyi p<,05 olarak belirlendi. Bulgular: Bu çalışmada, farklı yüzey işlemlerinin bağlanma dayanımı değerlerini etkilediği belirlendi. En yüksek ortalama bağlanma dayanım değeri kumlama grubunda elde edilirken (15,06 MPa), en düşük bağlanma dayanım değeri kontrol grubunda (5,06 MPa) saptandı. Bloklar arası yapılan istatistiksel karşılaştırmada; test edilen yüzey işlemleri açısından; kontrol ve kumlama gruplarında anlamlı farklar saptanmaz iken (HT, ST ve XT), glazür+HF asit veya zirkonya primer uygulanan ST blokların diğer bloklardan (HT ve XT) anlamlı düzeyde düşük bağlanma dayanım değerleri gösterdiği bulundu. Sonuç: Seçilen yüzey hazırlığı ve zirkonya blok tipi, rezin siman ile zirkonya arasındaki bağlanma dayanımını etkilemektedir. Simantasyon öncesi yüzey hazırlığı, zirkonya ile rezin siman arasındaki bağlanma dayanımını artırabilmektedir.
Anahtar Kelimeler: Bağlanma dayanımı; yüzey işlemi; zirkonya
Objective: The purpose of this in vitro study was to evaluate the effect of surface treatments on the bond strength of resin cement to newly developed zirconia ceramics characterized by different light transmisson properties. Material and Methods: 96 samples were prepared from 3 different zirconia blocks [Vita YZ HT (HT), Vita YZ ST (ST) and Vita YZ XT (XT)] with a diameter of 15.0 mm and a thickness of 3.0 mm. The specimens were divided into 4 subgroups (n=8) according to the surface treatment; control (A), airborne-particle abrasion (B), glaze+HF acid application (C) and zirconia primer (D). The shear bond strength was tested in a universal testing machine at a cross-head speed of 0.5 mm/min. The obtained data were statistically compared using two-way analysis of variance and Tukey HSD post-hoc test. Statistical significance was set at p<.05. Results: In the present study, the bond strength values were affected by the different surface treatments. The highest mean bond strength was obtained in the airborne-particle abrasion group (15.06 MPa) and the lowest bond strength was obtained in the control group (5.06 MPa). Statistical comparison between the tested blocks revealed no significant difference in the control and airborne-particle abrasion groups (HT, ST and XT), while significant differences were obtained among the blocks in the Glaze+HF acid or zirconia primer groups. Conclusion: The selected surface treatment method and zirconia block type affect the bond strength between zirconia and resin cement. Applying surface treatments to zirconia before cementation may increase bond strength between zirconia and resin cement.
Keywords: Shear bond strength; surface treatment; zirconia
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