Citation Information :
Campanella V, Gianni L, Libonati A, Gallusi G. Shaping Ability of Reciproc R25 File and Mtwo System Used in Continuous and Reciprocating Motion. J Contemp Dent Pract 2020; 21 (2):171-177.
Aim: Nickel–titanium (NiTi) instruments were designed to be used in continuous rotation mode with controlled speed and torque and a sequence of different sizes. The reciprocating motion was purposed to improve cyclic fatigue of rotary instruments if compared to the conventional rotation. The purpose of this work was to compare the shaping ability of Reciproc R25, Mtwo #25/0.06 used as a single file, and Mtwo sequence used in reciprocating motion and in continuous rotation. Materials and methods: Forty-eight endodontic training resin blocks ISO 15, 2% taper, 7 mm radius, and a 60° angle of curvature were shaped with four different protocols. Group I (Rrsf) was shaped with Reciproc R25 used as a single file in a reciprocating motion. Group II (Mrsf) was shaped with Mtwo #25/0.06 used as a single file in a reciprocating motion. Group III (MSrec) was shaped with Mtwo sequence in reciprocating motion, and finally, group IV (MSrot) was shaped with the Mtwo sequence used in continuous rotation. Preoperative and postoperative images of the simulated canals were taken under standardized conditions and combined exactly. The amount of resin removed was determined at both the inner and outer sides of the canal curvature. The ability of the instruments to remain centered in the canal was determined by calculating a centering ratio. These data were analyzed statistically using two factors analysis of variance (ANOVA) with Bonferroni correction (Bonferroni post-hoc test). Results: Group Rrsf produced a greater enlargement of the canal, especially on the outer side, in the apical and middle third (p < 0.05). Group MSrot produced a lower enlargement in the middle third (p < 0.05). Group Rrsf displayed a lower centering ratio in the apical third (p < 0.05). Group MSrot displayed a lower centering ratio in the coronal third (p < 0.05). Conclusion: The shaping of simulated canals using a sequence of instruments in continuous rotation resulted in a more centered preparation of the apical third. The reciprocating motion for all tested instruments produced a bigger enlargement of the canals. Clinical significance: Reciprocating movement results in a more pronounced canal enlargement but appears to be less respectful of the original canal curvature and produces more apical transportation than a sequence of rotary NiTi files with the same ending apical size.
Schilder H. Cleaning and shaping the root canal. Dent Clin North Am 1974;18(2):269–396.
Waila HM, Brantley WA, Gerstein H. An initial investigation of the bending and torsional properties of nitinol root canal files. J Endod 1988;14(7):346–351. DOI: 10.1016/S0099-2399(88)80196-1.
Parashos P, Messer HH. Rotary NiTi instrument fracture and its consequences. J Endod 2006;32(11):1031–1043. DOI: 10.1016/j.joen.2006.06.008.
Thompson SA, Dummer PMH. Shaping ability of ProFile 0.04 taper series 29 rotary nickel-titanium instruments in simulated root canals. Part 2. Int Endod J 1997;30(1):8–15. DOI: 10.1111/j.1365-2591.1997.tb01092.x.
Schäfer E, Lohmann D. Efficiency of rotary nickel-titanium FlexMaster instruments compared with stainless steel hand K-Flexfile. Part 1. Shaping ability in simulated curved canals. Int Endod J 2002;35(6):505–513. DOI: 10.1046/j.1365-2591.2002.00513.x.
Pruett JP, Clement DJ, Carnes Jr DL. Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 1997;23(2):77–85. DOI: 10.1016/S0099-2399(97)80250-6.
Zelada G, Varela P, Martin B, et al. The effect of rotational speed and the curvatura of root canals on the breakage of rotary endodontic instruments. J Endod 2002;28(7):540–542. DOI: 10.1097/00004770-200207000-00014.
De-Deus G, Moreira EJ, Lopes HP, et al. Extended cyclic fatigue life of F2 ProTaper instruments used in reciprocating movement. Int Endod J 2010;43(12):1063–1068. DOI: 10.1111/j.1365-2591.2010.01756.x.
Gavini G, Caldeira CL, Akisue E, et al. Resistance to flexural fatigue of reciproc R25 files under continuous rotation and reciprocating movement. J Endod 2012;38(5):684–687. DOI: 10.1016/j.joen.2011.12.033.
Pedullà E, Grande NM, Plotino G, et al. Influence of continuous or reciprocating motion on cyclic fatigue resistance of 4 different nickel-titanium rotary instruments. J Endod 2013;39(2):258–261. DOI: 10.1016/j.joen.2012.10.025.
Kiefner P, Ban M, De-Deus G. Is the reciprocating movement per se able to improve the cyclic fatigue resistance of instruments? Int Endod J 2014;47(5):430–436. DOI: 10.1111/iej.12166.
Shin CS, Huang YH, Chi CW, et al. Fatigue life enhancement of NiTi rotary endodontic instruments by progressive reciprocating operation. Int Endod J 2014;47(9):882–888. DOI: 10.1111/iej.12233.
Yared G. Canal preparation using only one Ni-Ti rotary instrument: preliminary observations. Int Endod J 2008;41(4):339–344. DOI: 10.1111/j.1365-2591.2007.01351.x.
Bürklein S, Schäfer E. Apically extruded debris with reciprocating single-file and full-sequence rotary instrumentation systems. J Endod 2012;38(6):850–852. DOI: 10.1016/j.joen.2012.02.017.
Johnson E, Lloyd A, Kuttler S, et al. Comparison between a novel nickel-titanium alloy and 508 nitinol on the cyclic fatigue life of ProFile 25/0.04 rotary instruments. J Endod 2008;34(11):1406–1409. DOI: 10.1016/j.joen.2008.07.029.
Pereira ES, Gomes RO, Leroy AM, et al. Mechanical behavior of M-Wire and conventional NiTi wire used to manufacture rotary endodontic instruments. Dent Mater 2013;29(12):e318–e324. DOI: 10.1016/j.dental.2013.10.004.
Copes HP, Gambarra-Soares T, Elias CN. Comparison of the mechanical properties of rotary instruments made of conventional nickel-titanium wire, M-wire, or nickel-titanium alloy in R-phase. J Endod 2013;39(4):516–520. DOI: 10.1016/j.joen.2012.12.006.
Bürklein S, Hinschitza K, Dammaschke T, et al. Shaping ability and cleaning effectiveness of two single-file systems in severely curved root canals of extracted teeth: Reciproc and WaveOne versus Mtwo and ProTaper. Int Endod J 2012;45(5):449–461. DOI: 10.1111/j.1365-2591.2011.01996.x.
Bürklein S, Benten S, Schäfer E. Shaping ability of different single-file systems in severely curved root canals of extracted teeth. Int Endod J 2013;46(6):590–597. DOI: 10.1111/iej.12037.
Navós BV, Hoppe CB, Mestieri LB, et al. Centering and transportation: in vitro evaluation of continuous and reciprocating systems in curved root canals. J Conserv Dent 2016;19(5):478–481. DOI: 10.4103/0972-0707.190008.
Hwang YH, Bae KS, Baek SH, et al. Shaping ability of the conventional nickel-titanium and reciprocating nickel-titanium file systems: a comparative study using micro-computed tomography. J Endod 2014;40(8):1186–1189. DOI: 10.1016/j.joen.2013.12.032.
Lim YJ, Park SJ, Kim HC, et al. Comparison of the centering ability of WaveOne and Reciproc nickel-titanium instruments in simulated curved canals. Restor Dent Endod 2013;38(1):21–25. DOI: 10.5395/rde.2013.38.1.21.
Schäfer E, Tepel J, Hoppe W. Properties of endodontic hand instruments used in rotary motion. Part 2. Instrumentation of curved canals. J Endod 1995;21(10):493–497. DOI: 10.1016/S0099-2399(06)80519-4.
Gambarini G, Plotino G, Sannino G, et al. Cyclic fatigue of instruments for endodontic glide path. Odontology 2013;103(1):56–60. DOI: 10.1007/s10266-013-0138-x.
Peters OA. Current challenges and concepts in the preparation of root canal systems: a review. J Endod 2004;30(8):559–565. DOI: 10.1097/01.DON.0000129039.59003.9D.
Schäfer E, Erler M, Dammaschke T. Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 1. Shaping ability in simulated curved canals. Int Endod J 2006;39(3):196–202. DOI: 10.1111/j.1365-2591.2006.01074.x.
Giuliani V, Di Nasco L, Pace R, et al. Shaping ability of waveone primary reciprocating files and ProTaper system used in continuous and reciprocating motion. J Endod 2014;40(9):1468–1471. DOI: 10.1016/j.joen.2014.02.024.
Berutti E, Paolino DS, Chiandussi G, et al. Root canal anatomy preservation of WaveOne reciprocating files with or without glide path. J Endod 2012;38(1):101–104. DOI: 10.1016/j.joen.2011.09.030.
de Carvalho GM, Sponchiado Jr EC, Garrido AD, et al. Apical transportation, centering ability, and cleaning effectiveness of reciprocating single-file system associated with different glide path techniques. J Endod 2015;41(12):2045–2049. DOI: 10.1016/j.joen.2015.09.005.
Bartols A, Christofzik DW, Krummel M, et al. Assessment of different root canal preparation techniques with rotary nickel-titanium instruments by novice students. Dent J 2018;6(3):46–55. DOI: 10.3390/dj6030046.
Goldberg M, Dahan S, Machtou P. Centering ability and influence of experience when using WaveOne single-file technique in simulated canals. Int J Dent 2012;2012:206321. DOI: 10.1155/2012/206321.
Yared G, Ramil GA. Single file reciprocation: a literature review. ENDO 2013;7(3):171–178.
De-Deus G, Arruda TE, Souza EM, et al. The ability of the Reciproc R25 instrument to reach the full root canal working length without a glide path. Int Endod J 2013;46(10):993–998. DOI: 10.1111/iej.12091.