1. Schirrmeister J, Wrbad KT, Meyer K, Altenburger M, Hellwig E. Efficacy of different rotary instruments for gutta-percha removal in root canal retreatment. J Endod. 2006;32:469-472.
https://doi.org/10.1016/j.joen.2005.10.052
PMid:16631851

2. Mollo A, Botti G, Prinicipi Goldoni N, Randellini E, Paragliola R, Chazine M, et al. Efficacy of two Ni-Ti systems and hand files for removing gutta-percha from root canals. Int Endod J. 2012;45:1–6.
https://doi.org/10.1111/j.1365-2591.2011.01932.x

3. Silva EJ, Orlowsky NB, Herrera DR, Machado R, Krebs RL, Coutinho-FilhoTde S. Effectiveness of rotatory and reciprocating movements in root canal filling material removal. Braz Oral Res. 2015;29:1-6.

4. Rodig T, Reicherts P, Konietschke F, Dullin C, HahnW, Hulsmann M. Efficacy of reciprocating and rotary NiTi instruments for retreatment of curved root canals assessed by micro-CT. IntEndod J. 2014;47:942-8.
https://doi.org/10.1111/iej.12239

5. Marques da Silva B, Baratto-Filho F, Leonardi DP, Henrique Borges A, Volpato L, Branco Barletta F. Effectiveness of ProTaper, D-RaCe, and Mtwo retreatment files with and without supplementary instruments in the removal of root canal filling material. Int Endod J. 2012;45:927–32.
https://doi.org/10.1111/j.1365-2591.2012.02051.x
PMid:22486933

6. Zuolo AS, Mello JE Jr, Cunha RS, Zuolo ML, Bueno CE. Efficacy of reciprocating and rotary techniques for removing filling material during root canal retreatment. Int Endod J. 2013;46:947–53.
https://doi.org/10.1111/iej.12085
PMid:23506150

7. Kasam S, Mariswamy AB. Efficacy of Different Methods for Removing Root Canal Filling Material in Retreatment - An In-vitro Study. JCDR. 2016;10:ZC06-ZC10.
https://doi.org/10.7860/JCDR/2016/17395.7904

8. Ma J, Al-Ashaw AJ, Shen Y, Gao Y, Yang Y, Zhang C, et al. Efficacy of ProTaper Universal Rotary Retreatment system for gutta-percha removal from oval root canals: a micro-computed tomography study. J Endod 2012;38:1516-20.
https://doi.org/10.1016/j.joen.2012.08.001
PMid:23063227

9. Advantages of Reciprocation and the RECIPROC ® blue System III User guide. [cited 2018 Jun 12]; Available from: https://www.vdw-dental.com/fileadmin/Dokumente/Sortiment/Aufbereitung/Reziproke-Aufbereitung/RECIPROC-blue/VDW-Dental-Reciprocblue-brochure-EN.pdf.

10. Mello Junior JE1, Cunha RS, Bueno CE, Zuolo ML. Retreatment Efficacy Of Gutta-Percha Removal Using A Clinical Microscope And Ultrasonic Instruments: Part I--An Ex Vivo Study. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009;108:e59-e62.
https://doi.org/10.1016/j.tripleo.2009.03.027

11. Khalighinejad N, Aminoshariae A, Kulild JC, Williams KA, Wang J, Mickel A. The Effect of the Dental Operating Microscope on the Outcome of Nonsurgical Root Canal Treatment: A Retrospective Case-control Study. J Endod. 2017;43:728–32.
https://doi.org/10.1016/j.joen.2017.01.015
PMid:28292597

12. Beasley RT, Williamson AE, Justman BC, Qian F. Time required to remove guttacore, Thermafil plus, and thermoplasticized gutta-percha from moderately curved root canals with protaper files. J Endod. 2013;39:125-8.
https://doi.org/10.1016/j.joen.2012.10.014
PMid:23228271

13.Gu LS, Ling JQ, Wei X, Huang XY. Efficacy of ProTaper Universal rotary retreatment system for gutta-percha removal from root canals. Int Endod J. 2008;41:288-95.
https://doi.org/10.1111/j.1365-2591.2007.01350.x
PMid:18081804

14. Zuolo ASD, Zuolo ML, Bueno CES, Chu R, Cunha RS. Evaluation of the efficacy of TruShape and Reciproc File systems in the removal of root filling material: an ex-vivo microcomputed tomographic study. J Endod. 2016;42:315-9.
https://doi.org/10.1016/j.joen.2015.11.005
PMid:26709199

15. Helvacioglu-Yigit D, Yilmaz A, Kiziltas-Sendur G, Aslan OS, Abbott PV. Efficacy of reciprocating and rotary systems for removing root filling material: a micro-computed tomography study. Scanning. 2014;36:576-81.
https://doi.org/10.1002/sca.21157
PMid:25168273

16. Capar I, Arslan H, Ertas H, et al. Effectiveness of ProTaper Universal retreatment instruments used with rotary or reciprocating adaptive motion in the removal of root canal filling material. Int Endod J. 2015;48:79–83.
https://doi.org/10.1111/iej.12279
PMid:24627969

17. Rödig T, Hausdörfer T, Konietschke F, Dullin C , Hahn W, Hülsmann M. Efficacy of D-RaCe and ProTaper Universal Retreatment NiTI instruments and hand files in removing gutta-percha from curved root canals – a micro-computed tomography study. Int Endod J. 2012;54:580-9.
https://doi.org/10.1111/j.1365-2591.2012.02014.x
PMid:22264204

18. Rödig T, Kupis J, Konietschke F, Dullin C, Drebenstedt S, Hülsmann M. Comparison of hand and rotary instrumentation for removing gutta-percha from previously treated curved root canals: a microcomputed tomography study. Int Endod J. 2014;47:173-82.
https://doi.org/10.1111/iej.12128
PMid:23701239

19. Schneider SW. A comparison of canal preparations in straight and curved canals. Oral Surg Oral Med Oral Pathol. 1971;32:271-5.
https://doi.org/10.1016/0030-4220(71)90230-1

20. Jou YT, Karabucak B, Levin J, Liu D. Endodontic working width: Current concepts and technqiues. Dental Clinics. 2004;48:323-35.
https://doi.org/10.1016/j.cden.2003.12.006
PMid:15066519

21. Rios Mde A, Villela AM, Cunha RS, Velasco RC, De Martin AS, Kato AS, et al. Efficacy of 2 reciprocating systems compared with a rotary retreatment system for gutta-percha removal. J Endod. 2014;40:543-6.
https://doi.org/10.1016/j.joen.2013.11.013
PMid:24666908

22. Özyürek T, Demiryürek EÖ. Efficacy of different nickel-titanium instruments in removing gutta-percha during root canal retreatment. J Endod. 2016;42:646–9.
https://doi.org/10.1016/j.joen.2016.01.007
PMid:26898565

23. Hülsmann M, Bluhm V. Efficacy, cleaning ability and safety of di¬fferent rotary NiTi instruments in root canal retreatment. Int Endod J. 2004;37:468-76.
https://doi.org/10.1111/j.1365-2591.2004.00823.x
PMid:15189436

24. Bramante CM, Betti LV. Efficacy of Quantec rotary instruments for gutta-percha removal. Int Endod J. 2000;33:463-7.
https://doi.org/10.1046/j.1365-2591.2000.00340.x