BT-Race ve HyFlex CM döner alet sistemlerinin dönme yorgunluğu dayanımlarının değerlendirilmesi

Amaç: Bu çalışmanın amacı, özel ısıl işlemden üretilen HyFlex CM ve elektro-kimyasal yüzey işlemi yapılan BT-Race döner alet sistemlerinin dönme yorgunluğu dayanımlarının karşılaştırılarak değerlendirilmesidir.Gereç ve yöntem: Toplamda 36 adet döner alet kullanılmıştır. BT-Race ve HyFlex CM döner alet sitemlerinin kullanıldığı 2 deney grubunda da üçgen kesite sahip, ISO 35,04 ve 25 mm uzunluktaki eğeler kullanılmıştır. Dönme yorgunluğu testi, 45o eğim açısı, 5 mm eğim yarıçapı ve 1,5 mm iç çapa sahip paslanmaz çelik yapay bir kanal düzeneğinde yapılmıştır. Eğelerin kırılmasına kadar geçen süre bir kronometre ile saniye cinsinden kaydedilmiş ve elde edilen değere göre kırılma anındaki dönme sayısı hesaplanmıştır. Verilerin değerlendirilmesinde bağımsız t testi kullanılmıştır. Sonuçlar, anlamlılık p

Comparison of cyclic fatique resistance of BT-Race and HyFlex CM instruments

Aim: The aim of this study is to compare the cyclic fatique resistance of HyFlex CM and BT-Race.Materials and Methods: Two types of NiTi instruments with similar size 35, .04 taper and 25 mm length with triangular cross-section were selected: BT-Race and HyFlex CM. Totally thirty-six files were tested in a stainless steel block with a 1,5 mm-wide simulated canal with a curvature of 45o and a radius of 5 mm. The time to fracture was recorded in seconds for each instrument and the number of cycles to failure was calculated. Data were analyzed with t-test and p<0,05 was considered to be statistically significant. Results: The number of cycles to failure for HyFlex CM (532.36±76.60) was significantly higher than BT-Race (294.72±66.17) (p=0.0001).Conclusions: The results showed that the HyFlex CM instrument, which is made of special 'controlled memory' alloy, had higher cyclic fatique resistance than electropolished BTRace instrument.

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