Abstract
The present study compared the shaping efficiency of universal system F2 one file NiTi to one NiTi file gold system with reciprocating motion in curved mesiobuccal roots of maxillary first molars, were randomly divided into two groups, each one 15 roots according to the NiTi system using during shaping the roots, after use of each instrument, the canal was flushed with 5 ml of NaOCL and final rinse with EDTA 17% for 1 minute. Parameter were evaluated: Straighten the curved canals, pre and post canals curvatures images were taken using Standarization technique and analyzed using digital radiography (Digora system), the significant level was set at P<0.05. The result showed that NiTi universal Protaper file produced higher amount and percentage of reduction of canal curvature than gold NiTi file system.
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