Aim The aim of this study was to evaluate the shaping outcome of manual ProTaper in simulated root canals in resin blocks. Methodology 21simulated curved canals in resin blocks were prepared by one dentist in 3 sequent days. All the blocks were instrumented following the instruction. Instrument separation, aberrations and time to prepare each canal were recorded. Measurements were carried out at the beginning of the curve (BC); the apex of the curve (AC); the endpoint (EP) of the prepared canals by pre-operative and post-operative superimposed pictures. Results 7 success, 8 instruments separation and 6 ledges were noted. The most frequent instrument separation place was found at the AC to EP (6/8). F1 is the most easily separated instrument (5/8). The average time consumed for preparation is 20 minutes. Conclusions It is suggested that at least 10 simulated curved canal resin blocks practiced by the practioner and can get more successive preparations. A high incidence of instrument separation was found when using the F1.
