Therefore , the rotary NiTi Hero 642 and K3 files demonstrated comparable shaping abilities and maintenance of working length
The aim of the present study was to compare the root canal preparation ability of rotary nickel-titanium ( NiTi ) Hero 642 and K3 files in curved m and ibular or maxillary molars .
A comparison of Profile, Hero 642, and K3 instrumentation systems in teeth using digital imaging analysis.
OBJECTIVE To evaluate the changes in cross-sectional area morphology of curved canals after instrumentation with Profile((R ) ) , Hero 642((R ) ) , and K3((R ) ) using digital imaging analysis . Study design Thirty mesial m and ibular curved canals were used ( 25 - 40 degrees ) . The molars were embedded in resin and the roots were sectioned transversely at three levels : apical , middle , and coronal . The canals were r and omly distributed into 3 groups for instrumentation using Profile.04 and .06 , Hero 642 , and K3 . The pre- and postinstrumentation sections were digitized and areas corresponding to the canals were measured with image-processing software . RESULTS Hero  eliminated significantly more dentine than K3 and Profile in all 3 sections ( P < .01 , ANOVA test ) , with no differences observed between the latter 2 systems ( P > .05 , Student-Newman-Keuls test ) . All 3 systems yielded a rounded canal morphology in the coronal , middle , and apical thirds . CONCLUSION Hero rotary instruments produced more changes in cross-sectional area of the root canal
Therefore , the rotary NiTi Hero 642 and K3 files demonstrated comparable shaping abilities and maintenance of working length
The aim of the present study was to compare the root canal preparation ability of rotary nickel-titanium ( NiTi ) Hero 642 and K3 files in curved m and ibular or maxillary molars .