Authors:
Jad Rebeiz · Claire El Hachem · Nada El Osta · Marc Habib · Tamara Rebeiz · Carla Zogheib . Marc Krikor Kaloustian
Abstract:
The purpose is to evaluate canal transportation of a new heat-treated NiTi system, the Endostar E3 Azure operated in con-
tinuous rotation or reciprocation. 40 resin blocks were divided into two groups. The first was shaped in continuous rotation
while the second in reciprocation. A preoperative and two postoperative images were taken, one after the use of the 20/06
and one after the 25/06. The images were superimposed to determine canal transportation. Time required for canal shaping
was recorded. One-sample and student t tests, repeated-measure analyses of variance, univariate analyses and Bonferroni
multiple comparisons tests were used for statistical analysis. The significance level was set at p<0.05. There was no signifi-
cant difference between continuous and reciprocating motion with the 20/06 and 25/06, respectively, at 1 mm (p=0.761,
p=0.559), 2 mm (p=0.584, p=0.810) and 3 mm (p=0.651, p=0.070). The reciprocating motion showed significantly less
canal transportation at 5 mm (p=0.049, p<0.001) and 7 mm (p<0.001, p<0.001) for the 20/06 and 25/0.6. Continuous
rotation was more time-consuming than reciprocation (p<0.001). The Endostar E3 Azure in reciprocation respected the
original canal curvature better than in continuous rotation at all levels, and required less time to prepare artificial curved
canals. Endodontists should know the shaping abilities of novel heat-treated NiTi files, regarding canal transportation and
its relation with the instruments’ motion and apical diameter enlargement.