fa SHAPING ABILITY OF NICKEL-TITANIUM ROTARY INSTRUMENTS IN CURVED ROOT CANALS اندودانتیکس Endodontics پژوهشي Research <p> <strong>Introduction:</strong></p><p>  Disinfection and subsequent obturation of the root canal space require adequate mechanical enlargement of the canals. The purpose of this in vitro study was to compare the shaping ability of Mtwo, RaCe and Medin rotary instruments during the preparation of curved root canals. <strong></strong></p><p> <strong>Materials and Methods:</strong> </p><p> Sixty mesiobuccal root canals of mandibular molars with severe curvatures between 25-35° and radius of 4-9 mm were randomly divided into three groups of 20 canals each. Using pre- and post-instrumentation radiographs, straightening of the canal and the apical transportation were determined with AutoCAD software. The data were analyzed using Chi square, analysis of variance, and post-hoc tests and the significance level was set at P<0.05. </p><p> <strong>Results:</strong> </p><p> Mtwo instruments maintained the canal curvature significantly better than Race and Medin instruments (P<0.05). There was significant difference between the rotary instruments for iatrogenic transportation of the major foramen (P>0.05). </p><p> <strong>Conclusions:</strong></p><p>  Under the conditions of this in vitro study, Mtwo instruments seemed superior to the two other rotary instruments. </p><hr><p></p><p> <strong>Source: </strong>Iranian Endodontic Journal </p><p> <a href="http://journals.sbmu.ac.ir/index.php/iej/article/view/3609" target="_blank"><font color="#0000ff">Full Text</font></a></p> Dental Instruments; NiTi Alloy; Root Canal; Root Canal Preparation 0 0 http://idai.ir/browse.php?a_code=A-10-32-2071&slc_lang=fa&sid=1 Ali Talati 10031947532846009707 10031947532846009707 No Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran Saeed Moradi moradis@mums.ac.ir 10031947532846009708 10031947532846009708 Yes Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran Maryam Forghani 10031947532846009709 10031947532846009709 No Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran Ali Monajemzadeh 10031947532846009710 10031947532846009710 No Department of Endodontics, Ahvaz University of Medical Sciences, Ahvaz, Iran