الفهرس 
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Abstract
The purpose of this study was to compare the cleaning and shaping abilities of the XP-endo Shaper and iRaCe files, regarding; canal cleanliness, canal curvature, and centering ability, by using stereomicroscope and CBCT.
Sixty extracted human permanent molars were collected for this study; thirty maxillary first and second molars (30 distobuccal canals) for the assessment of cleaning effectiveness by using stereomicroscope, and thirty mandibular first and second molars (30 mesiobuccal canals) for the evaluation of shaping ability by using CBCT. The samples were further divided into two equal groups according to the rotary file used (n=15); (group I) was instrumented with XP-endo Shaper and (group II) was instrumented with iRaCe sequence. After root canal instrumentation, the distobuccal roots of maxillary molars, were split longitudinally, for stereomicroscopic investigation at magnification of 40X. Images were captured then transferred to a computer to be analyzed by ImageJ software, to calculate debris percentage. The mandibular molars were put inside a mold, preparing for pre-and post-instrumentation CBCT scanning of the mesiobuccal canals, to evaluate changes in canal curvature, canal transportation, and centering ratio.
No statistically significant differences were observed between the 2 groups in percentage of debris, post instrumentation canal curvature, percentage of change of canal curvature, transportation, and centering ability (p>0.05). No statistically significant differences were observed between different canal levels within each group, regarding percentage debris, transportation, and centering ability (p>0.05), with only statistically significant differences were found between the apical third and the other canal thirds (p ≤ 0.05), regarding percentage of debris.