RSS-Feed abonnieren
DOI: 10.4103/1305-7456.120641
The evaluation of two rotary instrumentation techniques under "operator-related variables" standardized conditions
Publikationsverlauf
Publikationsdatum:
26. September 2019 (online)
ABSTRACT
Objective: We aimed here to evaluate the enlargement characteristics of two nickel-titanium rotary instrument systems that use two different preparation techniques, in simulated root canals under "operator-related variables" standardized conditions. Materials and Methods: A total of 40 simulated canals in resin blocks were divided into two groups as the Mtwo group for use with a single-length technique and the ProTaper instrument system group for use with crown down technique. To standardize the operator-related variables, all preparations were carried out with a computer controlled device that was developed and used previously as described in a published study. The pre- and post-operative digital images of the canals were superimposed and measured at 11 levels from the apical tip. The distances between the pre- and post-operative outer lines of the root canals were measured at both the inner and outer sides of the curve. The amount of removed material and the symmetry of the preparations were evaluated. Statistical analyses were performed with Mann-Whitney test. Results: Significantly more material was removed by Mtwo at 9 levels and by ProTaper at 2 levels (P < 0.05) while no significant difference was determined at 11 levels. The preparations made with ProTaper were more symmetrical at 4 levels while no significant difference was determined at 7 levels. Conclusions: Mtwo removed significantly more material than ProTaper at different levels of the curved root canals. Mtwo and ProTaper made symmetrical preparations and maintained the original shape of the root canal at different levels under controlled operator-related variables.
-
REFERENCES
- 1 Peters OA. Current challenges and concepts in the preparation of root canal systems: A review. J Endod 2004; 30: 559-67
- 2 Morgan LF, Montgomery S. An evaluation of the crown-down pressureless technique. J Endod 1984; 10: 491-8
- 3 Inan U, Gonulol N. Deformation and fracture of Mtwo rotary nickel-titanium instruments after clinical use. J Endod 2009; 35: 1396-9
- 4 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: 196-202
- 5 Bürklein S, Hiller C, Huda M, Schäfer E. Shaping ability and cleaning effectiveness of Mtwo versus coated and uncoated easyshape instruments in severely curved root canals of extracted teeth. Int Endod J 2011; 44: 447-57
- 6 Zhang EW, Cheung GS, Zheng YF. Influence of cross-sectional design and dimension on mechanical behavior of nickel-titanium instruments under torsion and bending: A numerical analysis. J Endod 2010; 36: 1394-8
- 7 Bonaccorso A, Cantatore G, Condorelli GG, Schäfer E, Tripi TR. Shaping ability of four nickel-titanium rotary instruments in simulated S-shaped canals. J Endod 2009; 35: 883-6
- 8 Kim HC, Kim HJ, Lee CJ, Kim BM, Park JK, Versluis A. Mechanical response of nickel-titanium instruments with different cross-sectional designs during shaping of simulated curved canals. Int Endod J 2009; 42: 593-602
- 9 Gambarini G, Pongione G, Rizzo F, Testarelli L, Cavalleri G, Gerosa R. Bending properties of nickel-titanium instruments: A comparative study. Minerva Stomatol 2008; 57: 393-8
- 10 Schäfer E, Oitzinger M. Cutting efficiency of five different types of rotary nickel-titanium instruments. J Endod 2008; 34: 198-200
- 11 Vahid A, Roohi N, Zayeri F. A comparative study of four rotary NiTi instruments in preserving canal curvature, preparation time and change of working length. Aust Endod J 2009; 35: 93-7
- 12 Uzun O, Topuz O, Aydýn C, Alaçam T, Aslan B. Enlarging characteristics of four nickel-titanium rotary instrument systems under standardized conditions of operator-related variables. J Endod 2007; 33: 1117-20
- 13 Plotino G, Grande NM, Falanga A, Di Giuseppe IL, Lamorgese V, Somma F. Dentine removal in the coronal portion of root canals following two preparation techniques. Int Endod J 2007; 40: 852-8
- 14 Kuzekanani M, Walsh LJ, Yousefi MA. Cleaning and shaping curved root canals: Mtwo vs ProTaper instruments, a lab comparison. Indian J Dent Res 2009; 20: 268-70
- 15 Giovannone T, Migliau G, Bedini R, Ferrari M, Gallottini L. Shaping outcomes using two Ni-Ti rotary instruments in simulated canals. Minerva Stomatol 2008; 57: 143-54