Comparison of apical transportation by Neo NiTi, reciproc rotary files and conventional hand instruments (in vitro study)

Introduction:Preserving the apical root structure during cleaning and shaping of the canal has always been a challenge in endodontics particularly when the root canals are curved. The purpose of this in vitro study was to compare the apical transportation induced by the R25 Reciproc and Neo-NiTi rotary systems in preparing the mesiobuccal root canal of the human maxillary molars. Materials & Methods:150 maxillary molar mesiobuccal canal having a 25-30 degree curvature and a radius of 3.5-10 mm were chosen. After disinfection the mesiobuccal roots were amputated from the crown and then mounted on a Acrylic block. Then devided in to 3 groups of A,B,C. Group A were prepared using R25 reciproc files, group B by Neo-NiTi and group C by K- files. And in the end the final radiographs were compared to the primary ones by Auto CAD software. And the data was transfered to Spss 18 and analysed. Results:The maximum apical transportation occurred in the k- file group at 0.5 mm from the radiographic apex and the minimum occurred for reciproc group at 0.5 mm from radiographic apex. By comparing all groups to each other, There are significant differece between Neo-niti and R25 reciproc and hands file in radiographic apex and reciproc and k-files in the apical 3mm(p