Selen KÜÇÜKKAYA EREN, Ahmet KELEŞ, Sevinc ASKERBEYLİ ÖRS, Hacer AKSEL

Kloroformun farklı nikel-titanyum retreatment eğe sistemlerinin döngüsel yorgunluk direncine etkisi

Amaç: Bu çalışmanın amacı, kloroformun dört farklı retreatment eğe sisteminin döngüsel yorgunluk direncine etkisini değerlendirmektir. Gereç ve Yöntemler: Bu çalışmada toplam 120 adet ProTaper D3, D-Race DR2, Mtwo R2 ve R-Endo R3 retreatment eğeleri kullanıldı. Her sistemden 30 adet eğe, rastgele 2 gruba ayrıldı (n=15); Grup 1: kloroformda bekletilme yapılmadı ve Grup 2: 5 dakika boyunca kloroformda bekletildi. Eğeler kırılana kadar döngüsel yorgunluk direnci test cihazında çalıştırıldı. Kırılana kadar olan döngü sayısı ve kırık parçaların uzunluğu kaydedildi. Taramalı elektron mikroskobu ile görüntüler incelendi. Elde edilen verilerin istatistiksel analizi iki yönlü varyans analizi ve Tukey testleri ile yapıldı (p=0,05).Bulgular: ProTaper D3 ve R-Endo R3 eğeleri kloroformda bekletilse de bekletilmese de en yüksek döngüsel yorgunluk direncini gösterdi (p>0,05). Kloroformda bekletme, eğelerin döngüsel yorgunluk direncini etkilemedi (p>0,05). Mtwo R2 eğeleri, kloroform uygulamasından önce de, sonra da D-Race DR2 eğelerinden anlamlı olarak döngüsel yorgunluğa daha dirençliydi (p<0,05). Sonuç: Kloroform, retreatment eğelerinin döngüsel yorgunluk direncini etkilemedi. Kloroform uygulamasından bağımsız olarak, ProTaper D3 ve R-Endo R3 eğeleri diğer eğe sistemlerinden anlamlı olarak daha yüksek döngüsel yorgunluk direnci gösterdi. Anahtar Kelimeler: döngüsel yorgunluk, endodonti, kloroform, nikel-titanyum, yenileme

Anahtar Kelimeler:

döngüsel yorgunluk, endodonti, kloroform, nikel-titanyum

Effect of chloroform on the cyclic fatigue resistance of nickel-titanium retreatment instruments

Background: The purpose of this study was to evaluate the cyclic fatigue resistance of 4 different rotary nickel-titanium (NiTi) retreatment instruments after immersion in chloroform solution. Methods: A total of 120 ProTaper D3, R-Endo R3, D-Race DR2 and Mtwo R2 retreatment instruments were used. Thirty instruments of each system were randomly divided into 2 groups (n=15); Group 1: no immersion and Group 2: immersion in chloroform for 5 min. The instruments were operated in a dynamic cyclic fatigue test device until fracture occurred. The number of cycles to fracture and length of the fractured fragment for each instrument were recorded. Representative samples were examined under a scanning electron microscope. Data were analyzed by using 2-way analysis of variance and Bonferroni tests. Results: The ProTaper D3 and R-Endo R3 instruments showed the highest cyclic fatigue resistance whether or not immersed in chloroform (p<0.05). The immersion in chloroform did not affect the cyclic fatigue resistance of the instruments (p>0.05). The Mtwo R2 instruments were more resistant to cyclic fatigue than the D-Race DR2 instruments before and after immersed in chloroform (p<0.05).Conclusion: The immersion in chloroform had no effect on the cyclic fatigue resistance of retreatment instruments. The ProTaper D3 and R-Endo R3 instruments were more resistant to cyclic fatigue than other retreatment instruments regardless of chloroform exposure. Keywords: chloroform, cyclic fatigue, endodontics, nickel-titanium, retreatment

Keywords:

chloroform cyclic fatigue, endodontics, nickel-titanium, retreatment,

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