Efficacy of three Ni–Ti rotary systems for removal of filling materials from root canal system of extracted teeth》.pdf

+ MODEL HOSTED BY Available online at ScienceDirect Tanta Dental Journal xx (2015) 1e6 /locate/tdj Efficacy of three NieTi rotary systems for removal of filling materials from root canal system of extracted teeth Maram Farouk Obeid*, Abeer Abdelhakim Elgendy 1 Department of Endodontics, Faculty of Dentistry, Ain Shams University, Abbasseya, Cairo, Egypt Received 20 June 2015; revised 3 July 2015; accepted 1 August 2015 Abstract Objectives: The aim of the present laboratory study was to evaluate the efficacy of ProTaper Next (PTN) in removing root canal fillings and comparing it with ProTaper Universal (PTU) and ProTaper Retreatment (PTR). Methods: Root canals in 60 single-rooted teeth were instrumented and obturated with gutta-percha and MTA Fillapex sealer then stored for one week. After that, the samples were divided randomly into three groups according to the instrument used in retreatment. Group 1, retreatment was done using ProTaper Retreatment (PTR), Group 2, retreatment was done using ProTaper Universal (PTU), and Group 3, retreatment was done using ProTaper Next (PTN). The total time required to achieve the end-point of root filling removal was recorded for each sample. Roots were split longitudinally, canals were observed using a stereomi- croscope at 10 . The images were subjected to morphometric analysis to assess the amount of remaining root filling material. Statistical analysis was performed by ANOVA and Tukeys honest significance difference post hoc tests were run on the data to