. E. Averbach-r and D. J. Kleier, Endodontics in the 21st century: the rotary revolution, Compend Contin Educ Dent, vol.22, p.34, 2001.

. J. Kleier-d and . E. Averbach-r, Comparison of clinical outcomes using a Nickel Titanium rotary orsStainless steel hand file instrumentation technique, Compend Contin Educ Dent, vol.27, pp.87-91, 2006.

. K. Iqbal-m, M. R. Kohli, and K. J. , A retrospective study of incidence of root canal instrument separation in an endodontics graduate program: A PennEndo database study, J Endod, vol.32, pp.1048-1052, 2006.

D. I. Fiore and P. M. , A dozen ways to prevent nickel-titanium rotary instrument fracture, J Am Dent Assoc, vol.138, pp.196-201, 2007.

D. I. Fiore, P. M. Genov-k, E. Komaroff, . P. Dasanayake-a, and . Lin-l, Fracture of ProFile nickel-titanium rotary instruments: a laboratory simulation assessment, Int Endod J, vol.39, pp.502-509, 2006.

D. I. Fiore, P. M. Genov-k, E. Komaroff, Y. Li, and . Lin-l,

, Nickel-titanium rotary instrument fracture: a clinical practice assessment, Int Endod J, vol.39, pp.700-708, 2006.

-. Parashos and P. Messer-h.h, The impact of instrument fracture on outcome of endodontic treatment, J Endod, vol.31, pp.845-50, 2005.

. Mandel-e, . Adib-yazdi-m, . M. Benhamou-l, T. Lachkar, C. Mesgouez et al., Rotary Ni-Ti profile systems for preparing curved canals in resin blocks: influence of operator on instrument breakage, Int Endod J, vol.32, pp.436-479, 1999.

-. Guntermann-a, . K. Kim-s, . Stachniss-v-;--wolcott-s, J. Wolcott, D. Ishley et al., Root canal shaping with manual stainless steel files and rotary Ni-Ti files performed by students, Int Endod J, vol.36, issue.10, pp.1139-1180, 2006.

-. K. Carp-s, . Miner-m, and . Skidmore-l, The causes, prevention, and clinical management of broken endodontic rotary files, Dent Today, vol.24, pp.78-80, 2005.

P. Parashos, H. H. Messer, . ;--collado-v, D. Faulks, S. Domejean et al., Undergraduate teaching and clinical use of rotary nickel–-titanium endodontic instruments: a survey of French dental schools, Eur J Dent Educ, vol.32, issue.13, pp.715-738, 2003.

-. Schimtlin, P. Sener, and B. Waltimo-t, HEROShapers ® : the adapted pitch concept. Endodontic Topics, vol.0, pp.155-62, 2005.

, Chelation in root canal therapy reconsidered, J Endod, vol.31, issue.11, pp.817-837, 2005.

-. Schonenberger, K. A. Peters-o, and . Barbakow-f,

-. Messer, H. H. , R. D. Andelin-w, . F. Browning-d, and G. H. Hsu, Questionnaire survey on the use of rotary nickel-titanium endodontic instruments by Australian dentists, Int Endod J, vol.36, pp.249-59, 2003.

. M. Torabinejad-m.-;-21--yared-g, . E. Bou-dagher-f, and . Machtou-p, 22 -EUROPEAN SOCIETY OF ENDODONTOLOGY. Quality guidelines for endodontic treatment: consensus report of the European Society of Endodontology, The effect of preflaring on the rates of separation for 0.04 taper nickel titanium rotary instruments, vol.28, pp.206-238, 2001.

. C. Ferraz-c and . J. Souza-filho-f, The outcome of endodontic treatment: a retrospective study of 2000 cases performed by a specialist, J endod, vol.33, pp.1278-82, 2007.

A. S. , Radiographic technical quality of root canal treatment performed by dental students at the Dental Teaching Center in Jordan, J Dent, vol.32, pp.301-308, 2004.

-. J. Gibson, M. Hammond, and M. T. Bryant-s,

. M. Dummer-p, An audit of root canal treatment performed by undergraduate students, Int Endod J, vol.34, pp.501-506, 2001.