مقايسه ميزان تغيير شكل نهايي و زمان آماده سازي كانال دندان با استفاده از فايل دستي استنلس استيل و سيستم هاي چرخشي نيكل تيتانيوم

A comparison of transportation and time of canal preparation with stainless steel hand instruments and Ni- Ti rotary systems (In - Vitro)

Background and Aim: Canal preparation, as a basis for a successful endodontic treatment, is a big challenge in curved canals. The aim of this study was to evaluate canal transplantation and time of its preparation with stainless steel hand instrument (k - Type) and Ni-Ti rotary systems: Profile and Hero 642. Materials and Methods: In this interventional study, forty - two extracted curved (20°-50°) human mandibular molars were divided into three groups. Canal preparations were performed with stainless steel hand instruments and Ni-Ti rotary systems: profile and Hero 642. Pre and post instrumentation radiographic images were superimposed. Mercury was injected pre and post instrumentation for canal shape recognition. A computer - based software (Core! Draw 7) was used for the analysis of canal transportation. Time of canal preparation was also recorded. Data was subjected to ANOVA statistical test. Results: Stainless steel hand instrument (k - Type) shaped significantly greater canal transportation both mesiodistally and buccolingually than profile and Hero642 (P<0.05). Time of canal preparation with Ni-Ti rotary systems was significantly less than that of hand file (P<0.05). Conclusion: Canal transportation and time of canal preparation in Ni-Ti rotary systems . were significantly less than stainless steel hand file.