FARKLI NİKEL-TİTANYUM DÖNER ALET SİSTEMLERİNİN FARKLI KİNEMATİKLERDE KULLANIMININ ENDODONTİK TEDAVİ GÖRMÜŞ KÖKLERİN KIRILMA DİRENCİNE OLAN ETKİSİNİN İNCELENMESİ

Amac. Calismamizin amaci ProTaper Universal (PTU), ProTaper Gold (PTG), Twisted File Adaptive (TFA) ve WaveOne (WO) NiTi Doner Alet sistemlerini farkli kinematiklerde kullanarak yapilan kok kanal sekillendirilmesinin dislerin kirilma direnclerine olan etkisini arastirmaktir. Gerec ve Yontem. Tek koklu ve tek kanalli 160 adet alt kesici disler secildi. Disler mine-sement birlesim yerinden ayrildiktan sonra ornekler 8 gruba bolundu (n=20). Grup 1 haric diger gruplarda 10 K-tipi ege kok kanallarinda ilerletildi ve bu boydan 1 mm cikartilarak calisma uzunlugu belirlendi. 15 K-tipi ege ile kayma yolu olusturuldu. Kontrol grubunda koklere hicbir sekillendirme islemi yapilmadi. WO egeleri sadece resiprokasyon hareketinde kullanildi. Diger egeler ise hem uretici talimatlarindaki hareketle hem de resiprokasyon hareketiyle kullanildilar. Orneklere periodontal ligamentleri taklit etmesi amaciyla elastomerik olcu maddesi kullanildi. Daha sonra Universal test cihazinda 1mm/ dakika hizla orneklere kuvvet uygulandi. Orneklerde kirilmaya neden olan maksimum kuvvet degerleri ( F-Max) belirlendi ve sonuclar tek yonlu varyans analizi (ANOVA) ve post-hoc LSD testleri kullanilarak istatistiksel degerlendirilmeye tabi tutuldu. (P 0.05). Sonuc. Calismamizda rotasyon veya resiprokasyon hareketiyle kok kanallari genisletilmesinin dislerin kirilma direncinde bir fark yaratmadigi gorulmustur fakat PTU ve PTG gruplarinin dislerin kirilma direnclerini azalttigi sonucuna varilmistir. Anahtar Kelimeler: ProTaper, Adaptive hareket, Rotasyon, Resiprokasyon Evaluation of the Effect of Different Nickel-Titanium Systems by Using Different Kinematics on the Fracture Resistance of Endodontically Treated Roots ABSTRACT Aim. The aim of our study is to investigate the effect of the preparation on the fracture resistance of teeth by using ProTaper Universal (PTU), ProTaper Gold (PTG), Twisted File Adaptive (TFA) and WaveOne (WO) NiTi rotary instrument systems in different kinematics. Material and methods. 160 mandibular incisor teeth with single root and single canal were chosen. After the teeth were separated from the cementoenamel junction, the roots were divided into eight groups (n=20). All groups except for group 1, the working length of the root canals were determined by inserting a size 10 K-type file into the root canal terminus and subtracting 1 mm from this measurement. A glide path was done via a size 15 K-type file. In the control group, the root canals were not prepared. WO files were used only in the reciprocating motion. Other files were used both with the movement in the manufacturer's instructions and with the reciprocating movement. The periodontal ligament was simulated by using elastomeric impression material. Vertical loading was carried out with a universal testing machine at 1 mm/min crosshead speed. The maximum force at fracture (F-max) was recorded for each root and the data were analyzed statistically by one way analysis of variance (ANOVA) and post-hoc LSD tests (P 0.05). Conclusion. In our study, it was observed that the root canal preparation did not make a difference in the fracture resistance of the teeth by rotation or reciprocation movement, but it was concluded that PTU and PTG groups reduced the fracture resistance of the teeth. Key Words: ProTaper, Adaptive motion, Rotation, Reciprocation