Cleaning efficacy of hand and rotary instrumentation techniques in oval-shaped root canals: scanning electron microscopic study

Monique Dossena Acauan, Amanda Donga, Renata Dornelles Morgental, Patricia Maria Poli Kopper, Simone Bonato Luisi, Fabiana Vieira Vier-Pelisser

Abstract


Objective: To assess the cleaning efficacy of the Mtwo rotary system, hand instrumentation and their combination in oval-shaped root canals.
Methods: Thirty human mandibular incisors were divided into three groups (G): GMtwo – basic series (10.04, 15.05, 20.06, 25.6) and instruments 30.05, 35.04, 40.04 from complementary series; GMtwo + Hand – basic series of Mtwo followed by sizes 30 to 40 hand instruments; GHand – classic technique with sizes 15 to 40 hand instruments. Teeth were longitudinally sectioned and then the buccal and lingual root canal walls were observed by scanning electron microscopy (SEM). Central images of each canal third were obtained and classified into scores based on the amount of smear layer (SL) and organic debris (OD). Data were analyzed by Kruskal-Wallis and Friedman tests.
Results: There was no significant difference between groups (P>0.05) regarding SL. The coronal third showed significantly lower scores than the other segments (P<0.05). In regard to OD, GHand scores were significantly lower than GMtwo + Hand (P<0.05). There was no significant difference between thirds (P>0.05).
Conclusion: None of the techniques were completely effective in cleaning oval-shaped root canals. The apical third was the area with higher amount of SL.

Keywords


Endodontics; root canal preparation; smear layer; scanning electron microscopy;

Full Text:

PDF

References


Foschi F, Nucci C, Montebugnoli L, Marchionni S, Breschi L, Malagnino VA, Prati C. SEM evaluation of canal wall dentine following use of Mtwo and ProTaper NiTi rotary instruments. Int Endod J 2004;37:832-9.

Rödig T, Hülsmann M, Kahlmeier C. Comparison of root canal preparation with two rotary NiTi instruments: ProFile .04 and GT rotary. Int Endod J 2007; 40:553-62.

Uzun O, Topuz O, Aydyn C, Alacam 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.

Elayouti A, Chu AL, Kimionis I, Klein C, Weiger R, Löst C. Efficacy of rotary instruments with greater taper in preparing oval root canals. Int Endod J 2008; 41:1088-92.

Yang G, Yuan G, Yun X, Zhou X, Liu B, Wu H. Effects of two nickeltitanium instrument systems, Mtwo versus ProTaper Universal, on root canal geometry assessed by micro-computed tomography. J Endod 2011;37:1412-6.

Wu MK, van der Sluis LW, Wesselink PR. The capability of two hand

instrumentation techniques to remove the inner layer of dentine in oval canals. Int Endod J 2003;36:218-24.

Peters OA, Paqué F. Current developments in rotary root canal instrument technology and clinical use: a review. Quintessence Int 2010;41: 479-88.

Wu MK, Wesselink PR. A primary observation on the preparation and obturation of oval canals. Int Endod J 2001;34:137-41.

Weiger R, ElAyouti A. Efficiency of hand and rotary instruments in shaping oval root canals. J Endod 2002;28:580-3.

Xu X, Eng M, Zheng Y, Eng D. Comparative study of torsional and bending properties for six models of nickel-titanium root canal instruments with different cross-sections. J Endod 2006;32:372-5.

Prati C, Foschi F, Nucci C, Montebugnoli L, Marchionni S. Appearance of the root canal walls after preparationwith NiTi rotary instruments: a comparative SEM investigation. Clin Oral Invest 2004;8:102-10.

Albrecht LJ, Baumgartner JC, Marshall JG. Evaluation of apical debris removal using various sizes and tapers of ProFile GT files. J Endod 2004;30:425-8.

Rödig T, Hülsmann M, Mü hge M, Schäfers F. Quality of preparation of oval distal root canals in mandibular molars using nickel-titanium instruments. Int Endod J 2002;35:919-28.

Paqué F, Balmer M, Attin T, Peters OA. Preparation of oval-shaped root canals in mandibular molars using NiTi rotary instruments. J Endod 2010;36:703-7.

Lumley PJ, Walmsley AD, Walton RE, Rippin JW. Cleaning of oval canals using ultrasonic or sonic instrumentation. J Endod 1993;19:453-7.

Hülsmann M, Schade M, Schäfers F.Acomparative study of root canal preparation with HERO 642 and Quantec SC rotary NiTi instruments. Int Endod J 2001;34:538-46.

Bowman CJ, Baumgartner JC. Gutta-percha obturation of lateral grooves and depressions. J Endod 2002;28:220-3.

Mader CL, Baumgartner JC, Peters DD. Scanning electron microscopic investigation of the smeared layer on root canal walls. J Endod 1984;10:477-83.

Pashley DH, Tao L, Boyd L, King GE, Horner JA. Scanning electron

microscopy of the substructure of smear layers in human dentine. Arch Oral Biol 1988; 33:265-70.

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.

Wu MK, Róris A, Barkis D, Wesselink PR. Prevalence and extent of long oval canals in the apical third. Oral Sur Oral Med Oral Pathol Oral Radiol Endod 2000;89:739-43.

Bystrom A, Sundqvist G. The antibacterial action of sodium hypochlorite and EDTA in 60 cases of endodontic therapy. Int Endod J 1985;18: 35-40.

Gu L, Kim JR, Ling J, Choi KK, Pashley DH, Tay FR. Review of contemporary irrigant agitation techniques and devices. J Endod 2009;35:791-804.

Ribeiro EM, Silva-Souza YTC, Souza-Gebriel AE, Souza-Neto MD,

Lorencetti KT, Silva SRC. Debris and smear removal in flattened root canals after use of different irrigant agitation protocols. Microsc Res Tech 2012;75:781-90.

Castelo-Baz P, Martín-Biedma B, Cantatore G, Ruíz-Piñon M, Bahillo J, Rivas-Mudiña B, Varela-Patiño P. In vitro comparison of passive and continuous ultrasonic irrigation in simulated lateral canals of extracted teeth. J Endod 2012; 38:688-91.




e-ISSN: 1980-6523

ISSN-L: 0102-9460

 

This journal is a member of, and subscribes to the principles of, the Committee on Publication Ethics (COPE) http://www.publicationethics.org


SJR (SCImago Journal & Country Rank) IMPACT FACTOR:

SCImago Journal & Country Rank

Licença Creative Commons

Except where otherwise noted, content of this journal is licensed under a Creative Commons Attribution 4.0 International license.

 

Editorial Policies of Brazilian Scientific Journals. Deposit availability: Blue .

 

Copyright: © 2006-2019 EDIPUCRS