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ENDODONTIA MODERNA OBJETIVANDO RESULTADOS CLÍNICOS

ENDODONTIA MODERNA OBJETIVANDO RESULTADOS CLÍNICOS
EEC

domingo, 1 de julho de 2012

JOE July 2012 - Geometric Analysis of Root Canals Prepared by Four Rotary NiTi Shaping Systems


Geometric Analysis of Root Canals Prepared by Four Rotary NiTi Shaping Systems 


Ahmed Abdel Rahman Hashem, BDS, MSc, PhD,* Angie Galal Ghoneim, BDS, MSc, PhD,† Reem Ahmed Lutfy, BDS, MSc, PhD,† Manar Yehia Foda, BDS, MSc, PhD,† and Gihan Abdel Fatah Omar, BDS, MSc, PhD‡



Abstract
Introduction: A great number of nickel-titanium (NiTi) rotary systems with noncutting tips, different cross- sections, superior resistance to torsional fracture, varying tapers, and manufacturing method have been introduced to the market. The purpose of this study was to evaluate and compare the effect of 4 rotary NiTi preparation systems, Revo-S (RS; Micro-Mega, Besancon Cedex, France), Twisted file (TF; SybronEndo, Amersfoort, The Netherlands), ProFile GT Series X (GTX; Dentsply, Tulsa Dental Specialties, Tulsa, OK), and Pro- Taper (PT; Dentsply Maillefer, Ballaigues, Switzerland), on volumetric changes and transportation of curved root canals. Methods: Forty mesiobuccal canals of mandibular molars with an angle of curvature ranging from 25 to 40 were divided according to the instru- ment used in canal preparation into 4 groups of 10 samples each: group RS, group TF, group GTX, and group PT. Canals were scanned using an i-CAT CBCT scanner (Imaging Science International, Hatfield, PA) before and after preparation to evaluate the volumetric changes. Root canal transportation and centering ratio were evaluated at 1.3, 2.6, 5.2, and 7.8 mm from the apex. The significance level was set at P # .05. Results: The PT system removed a significantly higher amount of dentin than the other systems (P = .025). At the 1.3-mm level, there was no significant difference in canal trans- portation and centering ratio among the groups. However, at the other levels, TF maintained the original canal curvature recording significantly the least degree of canal transportation as well as the highest mean centering ratio. Conclusions: The TF system showed superior shaping ability in curved canals. Revo-S and GTX were better than ProTaper regarding both canal transportation and centering ability. 


Key Words
Computed tomography, canal transportation, root canal volume, twisted file, Revo-S, GTX, ProTaper, nickel-titanium instruments 


(J Endod 2012;38:996–1000)


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