the aim of the present study was to evaluate and compere the shaping ability of four newly introduced nickel titanium file using cone beam tomography (CBCT) four types of Ni Ti rotary file were used in this study (protaper next, protaper gold, wave one, wave one gold).
Sixty extracted human mandibular molars were used in this study. The crowns were sectioned to the level of cemento enamel Junction. and the rots were sectioned to obtain mesial roots. all roots were positioned in a custom made holden for standardization of pre and post instrumentation images by (CBCT). Instrumentation of mesial canals by the four systems were performed according to the manufacture's recommendation. all samples were imaged used (CBCT). Canal transportation and centering ability were analyzed. the results showed that.
Result :Canal transportation Within both 3&5 mm planes, no significant difference in canal transportation was shown between the three file protaper gold, ware one gold and wave in files (P˃0.05), while protaper next transport the canals significaty (P˂0.05) more than the three files. Within 7 mm planes has no significant difference in transportation of the canal (P˃0.05) was found between all the tested files.
Centering ability: Regarding the centering ability of all tested files (protaper next, protaper gold, wave one gold and wave one files, no signifact difference wasfound between all groups (P˃0.05) at the three levels of the root canal (3.5 and 7mm)
Conclusion: Within the limitation of the present study, it was determined that all of the tested Ni Ti files caverd various level of canal transportation. Howeverprotaper gold, wave one gold and wave one Ni Ti files were found to be carve a lower degree of transportation than protaper next file.