COMPARISON OF CANAL SHAPING METHODS WITH GT™ ROTARY FILE AND CONDENSATION METHODS

Article information

Restor Dent Endod. 2002;27(5):521-529

Publication date (electronic) : 2002 January 14

doi : https://doi.org/10.5395/JKACD.2002.27.5.521

Yu-Mi Kang , Jeong-Hee Jin , Mi-Kyung Yu , Se-Joon Lee , Kwang-Won Lee

Department of Conservative Dentistry & Institute for Oral Bioscience, College of Dentistry, Chonbuk National University

Abstract

ABSTRACT

The purpose of this study was to compare the shaping time of two shaping methods and the leakage of three different obturation techniques. Ninty three canaled human molar teeth were used, which were randomly divided into two groups of forty teeth each and ten control teeth. After working length determination, the one group was prepared crown-down technique using rotary root canal instruments of GT rotary files .12/20, .10/20, .08/20 and .06/20 taper(Maillefer Instrument SA. Switzerland). The other group was instrumented with Gates Glidden burs(#1, #2, and #3) to coronal preparation and GT rotary files .08/20 and .06/20 taper to apical preparation. Shaping time was measured.

After root canals were instrumented, they were divided to three subgroups and obturated as follows: Subgroup 1, obturated with single cone method : Subgroup 2, obturated with lateral condensation : Subgroup 3, obturated with continuous wave technique. Three subgroups were obturated using non-standardized gutta-percha cone(Diadent, Korea, .06 or .08 taper) and AH-26(Dentsply DeTrey, Germany) as a root canal cement.

Ten unobturated teeth served as positive and negative controls. After immersion in 2% methylene blue solution for 1 month, the teeth were washed during 24h. The teeth were demineralized in 10% nitric acid and dehydrated by immersion in 80, 90 and 100% ethyl alcohol. The teeth were finally cleared and stored in 100%methylsalicylate, and apical dye penetration was evaluated under stereomicroscope(Leica M420, LC, U.S.A)at ×8.75 magnification.

Liner measurement of dye penetration was assessed with the use of digitalized image analysing system (analySIS, GmbH, Germany). The data were analysed statistically using independent T-test and Two-way ANOVA and Tukey test. The result were as follows:

In canal prepared with GT™rotary file, shaphing time taked more than the group of using Gates Glidden drill to coronal preparation without statistical significance (p>0.05).
The group of single cone obturation using canal preparation of GT™ rotary files showed significantly more apical leakage than those of lateral condensation and continuous wave technique regardless of shaping method (p<0.05).
The group of single cone obturation using canal preparation of GT™ rotary files and Gates Glidden drill showed significantly more apical leakage than those of continuous wave technique regardless of shaping method (p<0.05).
Regardless of shaping method, The group of continuous wave obturation showed less apical leakage than those of lateral condensation without statistical significance (p>0.05).
The group of single cone obturation using canal preparation of GT™ rotary files and Gates Glidden drill showed more apical leakage than the group of lateral condensation using same shaping method without statistical significance (p>0.05).

Fig. 1.

Mean dye penetration values for the linear measurement(μm)

Fig. 2.

Canal shaping : GT™ file, canal obturation : Single cone

Fig. 3.

Canal shaping : GT™ file, canal obturation : Continuous wave obturation

Fig. 4.

Canal shaping : G.G.D & GT™file, canal obturation : Single cone

Fig. 5.

Canal shaping :G.G.D & GT™file, canal obturation : Lateral condensation

Fig. 6.

Canal shaping : GT™file, canal obturation : Continuous wave obturation

Fig. 7.

Canal shaping : G.G.D & GT™file, canal obturation : Continuous wave obturation

Table 1.

Classification of group by canal shaping

Table 2.

Classification of group by sealing method & canal shaping

Table 3.

Mean preparation time(second) by canal shaping method

Table 4.

Statistical differences between experimental groups by shaping time.

Table 5.

Mean dye penetration values for the linear measurement(㎛).

Table 6.

Statistical differences between experimental groups by mean dye penetration(Two-way ANOVA).

References

1. Weine F S. Endodontic therapy 3rd ed.th ed. st. Louis: C.V. Mosby Co.. p. P.2. 1982.

2. Buchanan L S. The standardized-taper root canal preparation-part 3. GT file technique in large root canals with small apical diameters. Int. Endodont. J. 34(2):149–156. 2001;

3. Gluskin A H. A reconstructed computerized tomographic comparison of GT files versus traditional instruments in canals shaphed operators. Int. Endodont. J 34(6):476–484. 2001;

4. Cohen S, Burns R C. Pathways of the pulp 7th ed.th ed. st. Louis: C.V. Mosby Co.. p. P.258. 1998.

5. Leung S F, Gulabivala K. An in-vitro envaluation of the influence of canal curvature on the sealing ability of Thermafil. Int. Endodont. J. 27:190–196. 2001;

6. Skinner RL, Van Himmel T. The sealing ability of injection-molded thermoplasticized gutta-percha with and without the use of sealers. J Endodon 13:315–317. 1987;

7. Franklin S Weine. Endodontic Therapy 5th ed.th ed. st. Louis: Mosby. p. 436–437. 1996.

8. Schilder HC. Filling root canals in three dimensions. Dent. Clin. North Am 723:44. 1967;

9. Buchanan LS. The continuous wave of obturation technique :‘Centered’condensation of warm gutta percha in 12 seconds. Dent Today :61–67. 1996;

10. Kirk A. DuLac : Comparision of the obturation of Lateral by six Techniques. The American Association of Endodontics 25(5):376–380. 1999;

11. 임 동열, 이 희주, 허 복. 측방가압법과 system B^TM를 이용한 근 관충전시 근관만곡도에 따른 폐쇄효과의 비교. 대한치과보존학 회지 24:482–488. 1999;

12. Ludovic Pommel. Invitro Apical Leakage of System B Conmpared with other Filling Technicquesx. The American Assiciation of Endodontists 27(7):449–451. 2001;

13. Hervert Schilder. Filling root canals in three dimensions. Dental Clinics of North America November. 723–744. 1967.

14. Patrick Wahl. Optimal obturation and shaping. Dent Today June :78–81. 1996;

15. Buchanan LS. Cleaning and shaping the root canal system. In : Cohen S, Burns RC, eds. ed. pulp 5th ed.th ed. st. Louis, Mo, USA: Mosby-Yearbook, Inc..

16. Schilder H. Cleaning and shaping the root canal. Dental Clinics of North America 18:269–296. 1974;

17. Short JA, Morgan LA, Baumgartner JC. A comparision of canal centering ability of four techniques. Journal of Endodontics 23:503–506. 1997;

18. Walia H, Brantley WA, Gerstein H. An initial investigation of the investigation of the bending and torsion of Nitinol root canal files. Journal of Endodontics 14:346–351. 1988;

19. Coleman CL &, Svec TA. Anaylysis of Ni-Ti versus stainless steel intrumentation in root canals. Journal of Endodontics 23:232–235. 1997;

20. Thompson SA, Dummer PMH. Shaping ability of lightspeed rotary nickel-titanium instruments in stimulated root canals. Part2. The American Association of Endodentists 23(12):742–747. 1997;

21. 임 성삼 저. 임상근관치료학. 2th. 의치학사 :526–527. 1999;

22. Ozata F, Onal B, Erdilek N, Turkun SL. A comparative study of apical leakage of Apexit, ketac-endo, and diaket root canal sealers. J Endodon 25:603–604. 1999;

23. Ahlberg KMF, Assavanop P, Tay WM. A comparison of the apical dye penetration patterns shown by methylene blue and India ink in root-filled teeth. Int Endodon 28:30–34. 1995;

24. Limkangwalmongkol S, Abbott PV, Sandler AB. Apical dye penetration with four root canal sealers and gutta-percha using logitudinal sectioning. Int Endodon 18:535–539. 1992;

25. Limkangwalmongkol S, Burtscher P, Abbott PV, Sandler AB, Bishop BM. A comparative study of apical leakage of four root canal sealers and latrally condensed gutta-percha. Int Endodon 17:495–499. 1991;

26. Czonstkowsky M, Michanowicz A, Vazque J. Evaluation of an injection of thermoplasticized low temperature gutta-perch using radioactive isotopes. J Endodon 11:71–74. 1985;

27. Haikel Y, Wittenmeyer W, Bateman G, Bentaleb A, Allemann C. Anew method for the quantitative analysis of endodontic microleakage. J Endodon 25:172–177. 1999;

28. Mechailesco PM, Valcarcel J, Grieve AR, Levallois B, Lerner D. Bacterial leakage in endodontics : An improved method for quantification. J Endodon 22:535–539. 1996;

29. Miletic I, Anic I, PEzelj-Ribaric s, Jukics . Leakage of five root canal sealers. Int Endod J 32:415–418. 1999;

30. Beeler WJ, Marshall FJ, Brown AC. The permeability of apical barriers. J Endodon 15:422–426. 1989;

31. Tharuni L, Parameswaran A, Sukumaran VG. A comparison of canal preparation using the k-file and light speed in resin blocks. J Endodon 22:474–476. 1996;

32. 권오 상, 김성 교. 전동화일로 형성된 근관에서 비표준화 Gutta-percha cone의 적합성. 대한 치과 보존학회지 25:390–398. 2000;

33. Haikel Y, Wittenmeyer W, Bateman G, Bentaled A, Allemann C. A new method for quantitative analysis of endodontic microleakage. J Endodon 25:172–177. 1999;

34. Hopkins JH, Remeikis NA, Van Cura JE. Mcspadden versus lateral condensation:The exetent of apical microleakage. J Endodon 12:198–202. 1986;

35. Fuss Z, Rickoff BD, Santos Mazzal, Wikarzczuk M, Leon SA. Comparative sealing quality of gutta percha following the use of the Mcspadden compactor and engine plugger. J Endodon 11:117–121. 1985;

36. Kerekes K, Rowe A. Themomechanical compaction of gutta-percha root filling. Int Endodon J 15:27–35. 1982;

37. Bradshaw G B, Hall A, Edmunds DH. The sealing ability of injection-moulded thermoplasticized gutta-percha. Int Endodon J 22:17–20. 1989;

Article information Continued

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.