Gözde BAŞ, Elçin YÜZGÜLEÇ, Cangül KESKİN, Uğur İNAN

NORTH PROFA, RECIPROC BLUE VE ROTATE DÖNER SİSTEM NİTİ EĞELERİN ANİ APİKAL KURVATÜRLÜ KANALLARDA DÖNGÜSEL YORGUNLUK DİRENÇLERİNİN KARŞILAŞTIRILMASI

Amaç: Bu çalışmanın amacı North Profa RC Blue (25.08), Reciproc Blue (25.08) ve ROTATE (25.06) döner sistem nikel titanyum (NiTi) eğelerin ani apikal kurvatürlü kanallarda ve vücut sıcaklığında döngüsel yorgunluğa bağlı kırılma dirençlerinin karşılaştırılmasıdır. Gereç ve Yöntem: Bu çalışmada on ikişer adet North Profa RC Blue, Reciproc Blue ve ROTATE döner sistem NiTi eğeleri statik model döngüsel yorgunluk deney düzeneğinde, 90° kurvatür açısı ve 2 mm kurvatür yarıçapına sahip paslanmaz çelik yapay kanalda ve 37°C’ de kırılıncaya kadar kullanıldı. Eğelerin kırılma zamanı dijital kronometre ile kaydedildi. Kırılan parçaların uzunlukları dijital kumpas kullanılarak ölçüldü. Kırık yüzeyler kırılma tiplerinin belirlenmesi için taramalı elektron mikroskobu (SEM) ile incelendi. Eğelerin faz transformasyon sıcaklıkları ise diferansiyel taramalı kalorimetre (DSC) cihazında analiz edildi. Normal dağılım gösteren veriler tek yönlü ANOVA ve post hoc Tukey testi ile analiz edildi. Bulgular: North Profa RC Blue ve Reciproc Blue eğelerin döngüsel yorgunluk dirençleri arasında anlamlı bir fark olmadığı saptanırken (p> 0.05) her iki grubun döngüsel yorgunluk dirençleri ROTATE grubundan istatistiksel olarak anlamlı derecede yüksek bulundu (p<0.05). Kırık yüzeylerden alınan SEM görüntüleri incelenerek aletlerin döngüsel yorgunluk sonucunda kırıldığı doğrulandı. Sonuç: North Profa RC Blue ve Reciproc Blue eğelerin döngüsel yorgunluk direnci, ROTATE eğelerden daha yüksek bulundu. Eğelerin vücut sıcaklığında hangi fazda bulundukları ve kinematikleri döngüsel yorgunluk direncini etkilemektedir. Anahtar Kelimeler: Nikel titanyum; döngüsel yorgunluk COMPARISON OF CYCLIC FATIGUE RESISTANCE OF NORTH PROFA, RECIPROC BLUE AND ROTATE ROTARY NITI INSTRUMENTS IN CANALS WITH SEVERE APICAL CURVATURE ABSTRACT Aim: The aim of this study was to evaluate the cyclic fatigue resistance of North Profa RC Blue, Reciproc Blue and Rotate nickel titanium (NiTi) files in severe apical curvature at intracanal temperature. Material And Methods: In this study, 12 North Profa RC (25.08), 12 Reciproc Blue (25.08) and 12 ROTATE (25.06) rotary system NiTi files were used until fracture occurred, in static model cyclic fatigue testing device which has an artificial stainless steel canal with a 2-mm radius of curvature and a 90° angle of curvature, at an intracanal temperature of 37°C. The time to failure of the files was recorded using a digital chronometer. The lengths of the fractured fragments were measured using a digital caliper. The fractured surfaces of the files were examined under a scanning electron microscope (SEM). Phase transformation temperatures of the files were analyzed by differential scanning calorimeter (DSC) appliance. Normally distributed data were analyzed by one-way ANOVA and Tukey’s Post Hoc test. Results: No statistical difference was found between the cyclic fatigue resistance values of North Profa RC Blue and Reciproc Blue (p> 0.05). On the other hand, cyclic fatigue resistance values of both groups were higher than those of the ROTATE group, which was statistically significant(p<0.05). SEM images taken from fractured surfaces revealed that the files were fractured as a result of cyclic fatigue. Conclusion: Cyclic fatigue resistance values of North Profa RC Blue and Reciproc Blue nickel titanium files was greater than those of the ROTATE nickel titanium files. The phase transformation temperatures of the files at body temperature and their kinematics affect the cyclic fatigue resistance. Keywords: Nickel titanium; cyclic fatigue

Anahtar Kelimeler:

Nikel titanyum, döngüsel yorgunluk, Nickel titanium, cyclic fatigue

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