Comparative Study on the Ability of Instruments to Maintain Original Canal Curvature of Continuous rotary System and Single File System

Continuous rotary system과 single file system의 만곡 근관 형태 유지능에 대한 비교 연구

  • Park, Sang-Hee (Dept. of Conservative Dentistry, Chonbuk National University) ;
  • Kim, Deok-Joong (Dept. of Conservative Dentistry, Chonbuk National University) ;
  • Song, Yong-Beom (Dept. of Conservative Dentistry, Chonbuk National University) ;
  • Lee, Hye-Yun (Dept. of Conservative Dentistry, Chonbuk National University) ;
  • Kim, Hyoung-Sun (Dept. of Conservative Dentistry, Chonbuk National University) ;
  • Lee, Kwang-Won (Dept. of Conservative Dentistry, Chonbuk National University) ;
  • Yu, Mi-Kyung (Dept. of Conservative Dentistry, Chonbuk National University)
  • 박상희 (전북대학교 치의학전문대학원 치과보존학 교실) ;
  • 김덕중 (전북대학교 치의학전문대학원 치과보존학 교실) ;
  • 송용범 (전북대학교 치의학전문대학원 치과보존학 교실) ;
  • 이혜윤 (전북대학교 치의학전문대학원 치과보존학 교실) ;
  • 김형선 (전북대학교 치의학전문대학원 치과보존학 교실) ;
  • 이광원 (전북대학교 치의학전문대학원 치과보존학 교실) ;
  • 유미경 (전북대학교 치의학전문대학원 치과보존학 교실)
  • Received : 2012.10.03
  • Accepted : 2012.12.25
  • Published : 2012.12.30

Abstract

Shaping the root canal system to maintain original canal curvature is essential to clinical success in endodontic treatment. Opposed to most root canals that are curved, endodontic instruments are made from straight metal blanks. They have a tendency of straightening the root canal during preparation and frequently result in procedural errors. A new treatment method to maintain original canal curvature during shaping has been introduced for preventing procedural errors. The aim of this study was to compare the ability of instruments to maintain original canal curvature of continuous rotary system and single file system. Thirty ISO 15, 0.02 taper, Endo Training Blocks(Dentsplay Maillefer) were used. Specimens were assigned to 1 of 3 groups for shaping: specimens in group 1 were shaped with ProFile #20/.06 at the WL. Specimens in group 2 were shaped with Mtwo #35/.04 at the WL. Specimens in group 3 were shaped with WaveOne Primary reciprocating files at the WL after the glide path was achieved with PathFile. Pre- and postinstrumentation digital images were superimposed and processed with Matlab r2010b(The MathWorks Inc, Natick, MA) software to analyze the curvature-radius ratio(CRr), representing canal curvature modification. Data for comparison on the ability of instruments to maintain original canal curvature depending on each Ni-Ti file were analyzed with 1-way ANOVA(P<.05). Data for comparison on the ability of instruments to maintain original canal curvature depending on each Ni-Ti file system were analyzed with independent t-test(P<.05). A statistically significant difference(P<0.05) was noted on each Ni-Ti file. ProFile and WaveOne instrumentations maintained the original canal curvature significantly better(P<0.05) than Mtwo file. There were no significant difference(P>0.05) between continuous rotary system and single file system. Under the conditions of this study, ProFile and WaveOne instruments maintained the original curvature significantly better than Mtwo file and were less modification of the canal curvature compared. There was no significant difference between continuous rotary system and single file system in shaping of simulated canals. As clinical practitioners, it may be advantages to use hybrid approach when root canal shapes depending on the design and usage of Ni-Ti files.

Keywords

continuous rotary system;curvature radius ratio;Mtwo;ProFile;single file system;WaveOne

Acknowledgement

Supported by : 전북대학교병원

References

  1. Kim HC. Mechanical and geometric features of endodontic instruments and its clinical effect. JKACD. 2011 volume 36, Number 1
  2. Schafer E, Erler M, Dammaschke T. Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teeth. Int Endod J . 2006 Mar;39(3):203-12.
  3. Franco V, Fabiani C, Taschieri S, Malentacca A, Bortolin M, Del Fabbro M. Investigation on the shaping ability of nickel-titanium files when used with a reciprocating motion. J Endod. 2011 Oct;37(10):1398-401. Epub 2011 Aug 16.
  4. Cimilli H, Kartal N. Shaping ability of rotary nickel-titanium systems and nickeltitanium k-files in separable resin blocks. G Ital Endod. 2005;19:159.61.
  5. Dowker SE, Davis GR, Elliott JC. X-ray microtomography: nondestructive three-dimensional imaging for in vitro endodontic studies. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1997 Apr;83(4):510-6.
  6. Yang G, Yuan G, Yun X, Zhou X, Liu B, Wu H. Effects of two nickel-titanium instrument systems, Mtwo versus ProTaper universal, on root canal geometry assessed by micro-computed tomography. J Endod. 2011 Oct;37(10):1412-6. Epub 2011 Aug 16.
  7. Berutti E, Chiandussi G, Paolino DS, Scotti N, Cantatore G, Castellucci A, Pasqualini D. Canal shaping with WaveOne Primary reciprocating files and ProTaper system: a comparative study. J Endod. 2012 Apr;38(4):505-9. Epub 2012 Jan 31.
  8. Plotino G, Grande NM, Testarelli L, Gambarini G. Cyclic fatigue of Reciproc and WaveOne reciprocating instruments. Int Endod J . 2012 Jul;45(7): 614-8. doi: 10.1111/j.1365-2591.2012.02015.x. Epub 2012 Jan 23.
  9. Roane JB, Sabala CL, Duncanson MG. The "balanced force"concept for instrumentation of curved canals. J Endod 1985; 11(5): 203.11.
  10. Johnson E, Lloyd A, Kuttler S, Namerow K. Comparison between a novel nickel titanium alloy and 508 Nitinol on the cyclic fatigue life of Profile 25/.04 rotary instruments. J Endod 2008; 34(11): 1406-9.
  11. Webber J, Machtou P, Pertot W, Kuttler S, West J. The WaveOne single-file reciprocating system. INTERNATIONAL DENTISTRY AFRICAN EDITION VOL. 2, NO. 1
  12. Berutti E, Chiandussi G, Paolino DS, Scotti N, Cantatore G, Castellucci A, Pasqualini D. Effect of canal length and curvature on working length alteration with WaveOne reciprocating files. J Endod. 2011 Dec;37(12):1687-90. Epub 2011 Oct 27.
  13. Sattapan B, Palamara JE, Messer HH. Torque during canal instrumentation using rotary nickel-titanium files. J Endod. 2000 Mar;26(3):156-60.
  14. Berutti E, Paolino DS, Chiandussi G, Alovisi M, Cantatore G, Castellucci A, Pasqualini D. Root canal anatomy preservation of WaveOne reciprocating files with or without glide path. J Endod. 2012 Jan;38(1):101-4. Epub 2011 Nov 13.
  15. Vaudt J, Bitter K, Neumann K, Kielbassa AM. Ex vivo study on root canal instrumentation of two rotary nickel-titanium systems in comparison to stainless steel hand instruments. Int Endod J . 2009 Jan;42(1):22-33.
  16. Rhodes JS, Ford TR, Lynch JA, Liepins PJ, Curtis RV. Micro-computed tomography: a new tool for experimental endodontology. Int Endod J . 1999 May;32(3):165-70.
  17. Franco V, Fabiani C, Taschieri S, Malentacca A, Bortolin M, Del Fabbro M. Investigation on the shaping ability of nickel-titanium files when used with a reciprocating motion. J Endod. 2011 Oct;37(10):1398-401. Epub 2011 Aug 16.
  18. Bryant ST, Dummer PM, Pitoni C, Bourba M, Moghal S. Shaping ability of .04 and .06 taper ProFile rotary nickel-titanium instruments in simulated root canals. Int Endod J . 1999 May;32(3): 155-64.
  19. 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 Dec;37(12):832-9.
  20. Kuzekanani M, Walsh LJ, Yousefi MA. Cleaning and shaping curved root canals: Mtwo vs ProTaper instruments, a lab comparison. Indian J Dent Res. 2009 Jul-Sep;20(3):268-70.
  21. Al-Hadlaq SM, Aljarbou FA, AlThumairy RI. Evaluation of cyclic flexural fatigue of M-wire nickel-titanium rotary instruments. J Endod. 2010 Feb;36(2):305-7.
  22. Kim HC, Kwak SW, Cheung GS, Ko DH, Chung SM, Lee W. Cyclic fatigue and torsional resistance of two new nickel-titanium instruments used in reciprocation motion: Reciproc versus WaveOne. J Endod. 2012 Apr;38(4):541-4. Epub 2011 Dec 23.
  23. Yu DC, Schilder H. Cleaning and shaping the apical third of a root canal system. Gen Dent. 2001 May-Jun;49(3):266-70.
  24. Franco V, Fabiani C, Taschieri S, Malentacca A, Bortolin M, Del Fabbro M. Investigation on the Shaping Ability of Nickel-Titanium Files When Used with a Reciprocating Motion. J Endod. 2011 Oct;37(10):1398-401. Epub 2011 Aug 16.
  25. Ayar LR, Love RM. Shaping ability of ProFile and K3 rotary Ni-Ti instruments when used in a variable tip sequence in simulated curved root canals. Int Endod J . 2004 Sep;37(9):593-601.
  26. You SY, Kim HC, Bae KS, Baek SH, Kum KY, Lee W. Shaping ability of reciprocating motion in curved root canals: a comparative study with microcomputed tomography. J Endod. 2011 Sep;37(9): 1296-300. Epub 2011 Jul 16.
  27. Bryant ST, Thompson SA, al-Omari MA, Dummer PM. Shaping ability of Profile rotary nickel-titanium instruments with ISO sized tips in simulated root canals: Part 1. Int Endod J . 1998 Jul;31(4):275-81.
  28. Bryant ST, Thompson SA, al-Omari MA, Dummer PM. Shaping ability of ProFile rotary nickel-titanium instruments with ISO sized tips in simulated root canals: Part 2. Int Endod J . 1998 Jul;31(4):282-9.
  29. Lloyd A. Root canal instrumentation with ProFile trademark instruments. Endodontic Topics. Volume 10, Number 1, March 2005 , pp. 151-154(4)
  30. 김현철. 니켈티타늄 전동 파일의 형태에 따른 특성 과 임상적 의미 고찰. JKAE. 2010 vol. 11 No. 1.
  31. Peters OA. Current challenges and concepts in the preparation of root canal systems: a review. J Endod. 2004 Aug;30(8):559-67.
  32. Yang G, Yuan G, Yun X, Zhou X, Liu B, Wu H. Effects of two nickel-titanium instrument systems, Mtwo versus ProTaper universal, on root canal geometry assessed by micro-computed tomography. J Endod. 2011 Oct;37(10):1412-6. Epub 2011 Aug 16.
  33. Varela-Patiño P, Ibañez-Párraga A, Rivas-Mundiña B, Cantatore G, Otero XL, Martin-Biedma B. Alternating versus Continuous Rotation: A Comparative Study of the Effect on Instrument Life. J Endod. 2010 Jan;36(1):157-9.
  34. Varela-Patino, Martín-Biedma B, Rodriguez-Nogueira J, Cantatore G, Malentaca A, Ruiz-Pinón M. Fracture rate of nickel-titanium instruments using continuous versus alternating rotation. ENDO. 2008 Volume 2, Issue 3