Shaping ability of four nickel-titanium rotary instruments in simulated S-shaped canals.

INTRODUCTION The purpose of this study was to compare the shaping ability of ProTaper, Mtwo, BioRaCe, and BioRaCe + S-Apex instruments in simulated canals with an S-shaped curvature. METHODS Canal transportation and aberrations were assessed by comparing the preinstrumentation and postinstrumentation images under a stereomicroscope. Analysis of variance and post hoc Student-Newman-Keuls test were used for statistical analysis. RESULTS ProTaper instruments caused more pronounced canal transportation in the apical curvature (P < .01) than all other instruments. The use of ProTaper, Mtwo, and BioRaCe instruments resulted in more canal aberrations compared with BioRaCe + S-Apex (P < .05). CONCLUSIONS NiTi systems including less tapered and more flexible instruments like S-Apex seem to be favorable when preparing S-shaped canals.

[1]  P. Dummer,et al.  Shaping ability of .04 and .06 taper ProFile rotary nickel-titanium instruments in simulated root canals. , 1999, International endodontic journal.

[2]  S. A. Thompson,et al.  Shaping ability of ProFile rotary nickel-titanium instruments with ISO sized tips in simulated root canals: Part 2. , 2002, International endodontic journal.

[3]  Ove A. Peters,et al.  Mechanical preparation of root canals: shaping goals, techniques and means , 2005 .

[4]  F. Weine,et al.  Effect of preparation with endodontic handpieces on original canal shape. , 1976, Journal of endodontics.

[5]  E Schäfer,et al.  Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 1. Shaping ability in simulated curved canals. , 2006, International endodontic journal.

[6]  P. Esposito,et al.  A comparison of canal preparation with nickel-titanium and stainless steel instruments. , 1995, Journal of endodontics.

[7]  Geoff Bateman,et al.  Dynamic and cyclic fatigue of engine-driven rotary nickel-titanium endodontic instruments. , 1999 .

[8]  S. A. Thompson,et al.  Shaping ability of Hero 642 rotary nickel-titanium instruments in simulated root canals: Part 1. , 2000, International endodontic journal.

[9]  G. Condorelli,et al.  Defects in GT rotary instruments after use: an SEM study. , 2001, Journal of endodontics.

[10]  O. Peters,et al.  Effect of cyclic fatigue on static fracture loads in ProTaper nickel-titanium rotary instruments. , 2005, Journal of endodontics.

[11]  G. Yared,et al.  Cyclic fatigue of Profile rotary instruments after simulated clinical use. , 1999, International endodontic journal.

[12]  Adrian Kasaj,et al.  Radiographic investigation of frequency and location of root canal curvatures in human mandibular anterior incisors in vitro. , 2008, Journal of endodontics.

[13]  P. Dummer,et al.  Shaping ability of RaCe rotary nickel-titanium instruments in simulated root canals. , 2005, Journal of endodontics.

[14]  E. Schäfer,et al.  Cutting efficiency of five different types of rotary nickel-titanium instruments. , 2008, Journal of endodontics.

[15]  Bradford R Johnson,et al.  A scanning electron microscopy evaluation of microfractures, deformation and separation in EndoSequence and Profile nickel-titanium rotary files using an extracted molar tooth model. , 2007, Journal of endodontics.

[16]  E Schäfer,et al.  Comparative investigation of two rotary nickel-titanium instruments: ProTaper versus RaCe. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teeth. , 2004, International endodontic journal.

[17]  J Y Blum,et al.  Analysis of mechanical preparations in extracted teeth using ProTaper rotary instruments: value of the safety quotient. , 2003, Journal of endodontics.

[18]  M Hülsmann,et al.  Comparison of root canal preparation using RaCe and ProTaper rotary Ni-Ti instruments. , 2005, International endodontic journal.

[19]  S B Dove,et al.  A comparison of root canal preparations using Ni-Ti hand, Ni-Ti engine-driven, and K-Flex endodontic instruments. , 1995, Journal of endodontics.

[20]  J. P. Pruett,et al.  Cyclic fatigue testing of nickel-titanium endodontic instruments. , 1997, Journal of endodontics.

[21]  Sung Kyo Kim,et al.  A comparison of the shaping abilities of 4 nickel-titanium rotary instruments in simulated root canals. , 2003, Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics.

[22]  S A Thompson,et al.  Shaping ability of Profile rotary nickel-titanium instruments with ISO sized tips in simulated root canals: Part 1. , 2002, International endodontic journal.

[23]  E. Berutti,et al.  Influence of manual preflaring and torque on the failure rate of ProTaper rotary instruments. , 2004, Journal of endodontics.

[24]  Z. Cehreli,et al.  Comparative evaluation of three nickel-titanium instrumentation systems in human teeth using computed tomography. , 2006, Journal of endodontics.

[25]  E Schäfer,et al.  Comparative investigation of two rotary nickel-titanium instruments: ProTaper versus RaCe. Part 1. Shaping ability in simulated curved canals. , 2004, International endodontic journal.

[26]  Y. Yoshimine,et al.  The shaping effects of three nickel-titanium rotary instruments in simulated S-shaped canals. , 2005, Journal of endodontics.

[27]  K. Lim,et al.  The validity of simulated root canals for the investigation of the prepared root canal shape. , 1985, International endodontic journal.

[28]  J. Bahcall,et al.  An in vitro comparison of the rake angles between K3 and ProFile endodontic file systems. , 2005, Journal of endodontics.

[29]  D. Al-Sudani,et al.  A comparison of the canal centering ability of ProFile, K3, and RaCe Nickel Titanium rotary systems. , 2006, Journal of endodontics.

[30]  W. Johnson.  Color atlas of endodontics , 2002 .

[31]  V. Stachniss,et al.  Root canal preparation with the NiTi systems K3, Mtwo and ProTaper. , 2007, Australian endodontic journal : the journal of the Australian Society of Endodontology Inc.

[32]  R. Weiger,et al.  Efficacy of rotary instruments with greater taper in preparing oval root canals. , 2008, International endodontic journal.