Farklı Isıl İşlem ile Üretilmiş Nikel-Titanyum Eğelerin Vertikal Kök Kırık Direncine Etkisi

Amaç: Bu çalışmanın amacı, farklı ısıl işlem görmüş nikel-titanyum (NiTi) tellerinden üretilen döner eğeler ile prepare edilen dişlerin kırılma direncini değerlendirmektir. Gereç ve Yöntemler: Yüz adet tek kanallı mandibular premolar diş standart kök uzunluğu 13 mm olacak şekilde separe edilmiştir. Örnekler mesiodistal ve bukkolingual boyutları benzer olacak şekilde seçildi (p>0,05). Örnekler 4 çalışma grubu ve 1 kontrol grubu olacak şekilde rastgele dağıtıldı (n=20): Kontrol grubu; preparasyon ve obturasyon yapılmadı. Grup ProTaper Universal (PTU); PTU sistemi, grup Twisted File (TF); TF sistemi, grup ProTaper Next (PTN); PTN sistemi, Grup HyFlexControlled Memory (HCM); HCM sistemi kullanılarak örneklerin preparasyonu tamamlandı. Preparasyonların ardından örnekler güta perka ve kanal patı ile dolduruldu. Örneklere kırık oluşana kadar 1 mm/dk hızında vertikal yükleme yapıldı. Elde edilen verilerin istatistiksel analizi Tek yönlü varyans analizi ve Tukey testi ile gerçekleştirildi (p=0,05). Bulgular: Kontrol grubu en yüksek kırık direnci değerini gösterirken grup HCM ile aralarında istatistiksel olarak anlamlı bir fark bulunamadı (p>0,05). Çalışma gruplarının aralarında da anlamlı bir fark bulunamadı. Sonuç: Eğelere uygulanan ısıl işlemlerdeki farklılığın vertikal kök kırık direnci üzerine etkisi bulunmamaktadır.

Effect of Different Heat-treated NickelTitanium Files on Vertical Root Fracture Resistance

Objective: This study aimed to evaluate the fracture resistance of teeth instrumentedwith rotary files manufactured from different heat-treated nickel-titanium (NiTi)wires.Materials and Methods: One hundred extracted single-canal mandibular premolarteeth were sectioned, leaving a standard root length of 13 mm. Samples werematched with respect to the buccolingual-mesiodistal diameters. They wererandomly divided into four experimental groups and one control group (n=20):Control group, no preparation or obturation; ProTaper Universal (PTU) group,prepared with the PTU system as a universal NiTi; Twisted File (TF) group, preparedwith the TF system as an R-phase treatment; ProTaper Next (PTN) group, preparedwith the PTN system as an M-Wire thermal treatment; and HyFlex ControlledMemory (HCM) group, prepared with the HCM system as a CM-Wire thermaltreatment. After preparations, samples were obturated with gutta-percha andsealer. Samples were subjected to a vertical loading force of 1 mm/min untilfracture occurred. Data were subjected to statistical analysis using One-wayANOVA (p=0.05) and Tukey tests.Results: Although the control group had the highest root fracture resistance value,the differences between the control group and HCM group was not significant(p>0.05). Except for the control group, the differences among the study groupswere not significant (p>0.05).Conclusion: Different heat treatments of instruments have no effects on verticalroot fracture resistance.

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