مقایسه آماده‌سازی کانال ریشه با استفاده از فایل‌های نیکل تیتانیومی دستی و روتاری Race

Introduction: Successful treatment of root depends on complete elimination of debris and bacteria’s from root canal system and appropriate shaping of canal in obturation canal preparation is the most difficult and time consuming stage during root canal treatment. This stage especially in curved and narrow canals always causes some problems for students, general dentist and specialist. Following placement of file in curved root canals, some faces are introduced to instrument which tends to straighten it. This leads to removing of much dentin from curvature of canal. Then a phenomenon which is called “apical displacement” will take place and canal will be widened more than usual. Objective: The aim of this study is comparison of preparation of root canal using NiTi hand & Race rotary instrument. Materials & Methods: In this study 40 acrylic blocks with canal curvature 75 degree divided in two groups of 20 in each were used with passive step back technique. Canals in first group were cleaned and shaped using NiTi hand files and second group with Race rotary ones. Rate of transportation in 1/3 apical of root and file fracture was under investigation and statistical analyzed. Results: In this investigation there was no relationship between transportation and file fracture during two methods of preparation. This study showed that the canal preparation using Race rotary file can be as efficient as NiTi hand files.