الفهرس 
Assessment of shaping ability of one curve single file in comparison to multiple-files protaper next rotary system : A comparative in vitro study d
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Abstract
Aim: The aim of this study was to evaluate the shaping ability of One Curve single file in comparison
to ProTaper Next system in curved mesiobuccal canals of human mandibular molars using CBCT
scanning.
Materials and methods: Thirty mesiobuccal root canals of extracted human mandibular first and
second molars with the angle of curvature ranging 20-45 ͦ(according to Schneider) were randomly
allocated into two equal groups; One Curve (OC) and ProTaper Next (PTN) groups. Samples were
mounted in two acrylic resin molds after access cavity preparation, working length determination and
sectioning of the distal roots with its respective part of the crowns. Then root canal preparation was
carried out in accordance with the manufacturer’s recommendations. Pre- and post-instrumentation
CBCT imaging was performed, and scans were superimposed using OnDemand 3D software to assess
the centering ability, canal transportation, and remaining dentin thickness of the tested instruments at
the determined root canal levels (3, 5 and 8 mm).
Results: Regarding the results of canal transportation and centering ability, there was no statistically
significant difference mesiodistally and buccolingually among the two groups at 3, 5, and 8mm
(P>0.05).Regarding remaining dentin thickness bucco-lingually, at 3, 5, and 8 mm, there was a statistically
significant difference (P0.05) between the two systems. Within PTN group, there was a statistically
significant difference between the coronal and each of middle and apical groups. While within OC
group there was statistically significant difference between 3-, 5- and 8-mm groups.
Mesio-distally, there was no statistically significant difference between the two groups at 3, 5 and 8
mm. Regarding PTN system, there was a statistically significant difference between coronal and each
apical and middle groups. While OC system showed a statistically significant difference between 3, 5,
8 mm mesially, and there was a statistically significant difference between the coronal with each apical
and middle groups distally.
Conclusion: The canal transportation values of the two tested rotary systems are considered acceptable.
Both systems were not able to achieve perfect centering ability during root canal preparation. There was
a statistically significant difference between two systems regarding remaining dentin thickness.