Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
권호 표지
DOI QR코드

DOI QR Code

Influence of root canal curvature on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

모형 레진근관에서 근관의 만곡도가 니켈-티타늄 전동 파일의 screw-in effect에 미치는 영향

  • Son, Ji-Young (Department of Conservative Dentistry, Kyungpook National University School of Dentistry) ;
  • Ha, Jung-Hong (Department of Conservative Dentistry, Kyungpook National University School of Dentistry) ;
  • Kim, Young-Kyung (Department of Conservative Dentistry, Kyungpook National University School of Dentistry)
  • 손지영 (경북대학교 치의학전문대학원 치과보존학교실) ;
  • 하정홍 (경북대학교 치의학전문대학원 치과보존학교실) ;
  • 김영경 (경북대학교 치의학전문대학원 치과보존학교실)
  • Received : 2010.09.04
  • Accepted : 2010.09.09
  • Published : 2010.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Objectives: Nickel-titanium (Ni-Ti) rotary instruments have some unexpected disadvantages including the tendency to screw-in to the canal. The purpose of this study was to evaluate the influence of root canal curvatures on the screw-in effect of Ni-Ti rotary files. Materials and Methods: A total of 80 simulated root canals in clear resin blocks were used in the study. Canals with curvature of 0, 10, 20 and 30 degrees were instrumented with ProTaper instruments SX, S1, S2 and a ProFile of #25/0.06 to 1.0-2.0 mm beyond the initial point of root curvature. The screw-in force was measured with a specially designed device while canal was instrumented with a ProFile of #30/0.06 at a constant speed of 300 rpm. The data were subjected to one-way ANOVA and Scheffe multiple range test for post-hoc test. Results: Larger degree of canal curvature generated significantly lesser screw-in forces in all groups (p < 0.001). Conclusions: More attention needs to be paid when using rotary instruments in canals with less curvature than canals with more curvatures to prevent or reduce any accidental overinstrumentation.

연구목적: 근관의 만곡도가 니켈-티타늄 전동파일의 screw-in effect에 미치는 영향을 평가하고자 하였다. 연구 재료 및 방법: 0, 10, 20, 그리고 30도의 만곡을 가지는 80개의 레진모형근관 (Nissin Dental Prod. Inc.)에서 0.06 경사도 30번 전동화일 (ProTaper, Dentsply-Maillefer)을 분당 300회전, 단일 pecking 동작으로 기구조작하였으며 dynamometer를 이용하여 발생한 screw-in force를 측정하였다. 결과치는 one-way ANOVA로 통계처리 하였고, Scheffe multiple range test를 사용하여 95% 수준에서 유의성을 검정하였다. 결과: 근관의 만곡도가 작을수록 screw-in force가 높게 나타났으며 (p < 0.001), 모든 그룹 간에 유의성 있는 차이를 보였다. 결론: 이 결과로 미루어 볼 때, 근관의 만곡도가 작을수록 screw-in force가 많이 발생하는 것으로 보여지며, 따라서 기구조작 동안의 screw-in force를 방지 또는 억제하기 위해서는 만곡도가 작은 근관을 성형할 때 더 많은 주의가 요구될 것으로 생각된다.

Keywords

References

  1. Pettiette MT, Olutayo Delano E, Trope M. Evaluation of success rate of endodontic treatment performed by students with stainless-steel K-files and Nickel-Titanium hand files. J Endod 2001;27:124-127. https://doi.org/10.1097/00004770-200102000-00017
  2. Al-Omari MA, Dummer PM, Newcombe RG, Doller R. Comparison of six files to prepare simulated root canals. Part 2. Int Endod J 1992;25:67-81. https://doi.org/10.1111/j.1365-2591.1992.tb00739.x
  3. Nagy CD, Bartha K, Bernath M, Verdes E, Szabo J. The effect of root canal morphology on canal shape following instrumentation using different techniques. Int Endod J 1997;30:133-140. https://doi.org/10.1111/j.1365-2591.1997.tb00685.x
  4. Peters OA, Peters CI, Schonenberger K, Barbakow F. ProTaper rotary root canal preparation: assessment of torque and force in relation to canal anatomy. Int Endod J 2003;36:93-99. https://doi.org/10.1046/j.1365-2591.2003.00628.x
  5. Esposito PT, Cunningham CJ. A comparison of canal preparation with nickel-titanium and stainless steel instruments. J Endod 1995;21:173-176. https://doi.org/10.1016/S0099-2399(06)80560-1
  6. Glosson CR, Hallor RH, Dove SB, del Rio CE. A comparison of root canal preparations using nickel-titanium hand, nickel-titanium engine-driven, and K-flex endodontic instruments. J Endod 1995;21:146-151. https://doi.org/10.1016/S0099-2399(06)80441-3
  7. Short JA, Morgan LA, Baumgartner JC. A comparison of canal centering ability of four instrumentation techniques. J Endod 1997;23:503-507. https://doi.org/10.1016/S0099-2399(97)80310-X
  8. Huh YJ, Kim SK. Change in root canal configuration using different file types and techniques. J Kor Acad Cons Dent 1997;22:291-304.
  9. Sjo gren U, Hagglund B, Sundqvist G, Wing K. Factors Affecting the Long-term Result of Endodontic Treatment. J Endod 1990;16:498-504. https://doi.org/10.1016/S0099-2399(07)80180-4
  10. Park WK, Lee HJ, Hur B. Shaping ability of nickeltitanium rotary files. J Kor Acad Cons Dent 2004;29: 44-50. https://doi.org/10.5395/JKACD.2004.29.1.044
  11. Walia H, Brantley WA, Gerstein H. (1988) An initial investigation of the bending and torsional properties of Nitinol root canal files. J Endod 1988;14:346-351. https://doi.org/10.1016/S0099-2399(88)80196-1
  12. Yun HH, Kim SK. A comparison of the shaping abilities of 4 nickel-titanium rotary instruments in simulated root canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2003;95:228-233. https://doi.org/10.1067/moe.2003.92
  13. Ha JH, Jin MU, Kim YK, Kim SK. Comparison of screw-in effect for several nickel-titanium rotary instruments in simulated root canal. J Kor Acad Cons Dent 2010;35:267-272. https://doi.org/10.5395/JKACD.2010.35.4.267
  14. Oh SH, Park JK, Hur B, Kim HC. Comparison of screw-in effect of three NiTi file systems used by undergraduates. J Kor Acad Cons Dent 2006;31:477-484. https://doi.org/10.5395/JKACD.2006.31.6.477
  15. Gutierrez JH, Brizuela C, Villota E. Human teeth with periapical pathosis after overinstrumentation and overfilling of the root canals: a scanning electron microscopic study. Int Endod J 1999;32:40-48. https://doi.org/10.1046/j.1365-2591.1999.00185.x
  16. Leslie Ann Malueg, Lisa R Wilcox, William Johnson. Examination of external apical root resorption with scanning electron microscopy. Oral Surg Oral. Med Oral Pathol 1996;82:89-93. https://doi.org/10.1016/S1079-2104(96)80383-0
  17. Seltzer S, Soltanoff W, Sinai I, Goldenberg A, Bender IB. Biologic aspects of endodontics. Part III. Periapical tissue reaction to root canal instrumentation. Oral Surg Oral Med Oral Pathol 1968;26:534-546. https://doi.org/10.1016/0030-4220(68)90334-4
  18. Shimon F, Claus L, Malaekeh Z, Trope M. Evaluation of success and failure after endodontic therapy using a glass ionomer cement sealer. J Endod 1995;21:384-390. https://doi.org/10.1016/S0099-2399(06)80976-3
  19. Smith CS, Setchell DJ, Harty FJ. Factors influencing the success of conventional root canal therapy-a fiveyear retrospective study. Int Endod J 1993;26:321-333. https://doi.org/10.1111/j.1365-2591.1993.tb00765.x
  20. Diemer F, Calas P. Effect of Pitch Length on the Behavior of Rotary Triple Helix Root Canal Instruments. J Endod 2004;30:716-718. https://doi.org/10.1097/01.DON.0000125877.26495.69
  21. Schra der C, Peter OA. Analysis of torque and force with differently tapered rotary endodontic instruments in vitro. J Endod 2005;31:120-123. https://doi.org/10.1097/01.don.0000137634.20499.1d
  22. Sung HJ. Influence of taper on the screw-in effect of nickel-titanium rotary files. MSc thesis Kyungpook National University, Daegu, Korea, 2006.
  23. Schilder H. Cleaning and shaping the root canal. Dent Clin Nor Am 1974;18:269-296.
  24. Weine FS, Kelly RF, Lio PJ. The effect of preparation procedures on original canal shape and on apical foramen shape. J Endod 1975;1:255-262. https://doi.org/10.1016/S0099-2399(75)80037-9
  25. Sabal CL, Roane JB, Southard LZ. Instrumentation of curved canals using a modofied tipped instrument: a comparison study. J Endod 1988;14:59-64. https://doi.org/10.1016/S0099-2399(88)80002-5
  26. Schneider SW. A comparison of canal preparations in straight and curved root canals. Oral Surg Oral Med Oral Pathol 1971;32:271-275. https://doi.org/10.1016/0030-4220(71)90230-1
  27. Leeb J. Canal orifice enlargement as related to biomechanical preparation. J Endod 1983;9:463-470. https://doi.org/10.1016/S0099-2399(83)80160-5
  28. Contreras MAL, Zinman EH, Kaplan SK. Comparison of the first file that fits at the apex, before and after early flaring. J Endod 2001;27:113-116. https://doi.org/10.1097/00004770-200102000-00014
  29. Tan BT, Messer H. The effect of instrument type and preflaring on apical file size determination. Int Endod J 2002;35:752-758. https://doi.org/10.1046/j.1365-2591.2002.00562.x
  30. Thompson SA, Dummer PM. Shaping ability of Hero 642 rotary nickel-titanium instruments in simulated root canals, part 1. Int Endod J 2000;33:248-254. https://doi.org/10.1046/j.1365-2591.2000.00287.x
  31. Johnson BW. Endodontics: what, when, and why. In: Wei S editor. Contemporary endodontics Dentsply Asia, Hong Kong; 2002.p.1-6.
  32. Hal kel Y, Serfaty R, Bateman G, Senger B, Allemann C. Dynamic and cyclic fatigue of engine-driven rotary nickel-titanium endodontic instrument. J Endod 1999; 25:434-440. https://doi.org/10.1016/S0099-2399(99)80274-X
  33. Roane JB, Sabala CL, Duncanson MG Jr. The “balanced force”concept for instrumentation of curved canals. J Endod 1985;11:203-211. https://doi.org/10.1016/S0099-2399(85)80061-3
  34. Kyomen SM, Caputo AA, White SN. Critical analysis of the balanced force technique in endodontics. J Endod 1994;20:332-337. https://doi.org/10.1016/S0099-2399(06)80095-6
  35. Wildey WL, Senia ES, Montgomery S. Another look at root canal instrumentation. Oral Surg Oral Med Oral Pathol 1992;74:499-507. https://doi.org/10.1016/0030-4220(92)90303-8

Cited by

  1. Mechanical and geometric features of endodontic instruments and its clinical effect vol.36, pp.1, 2011, https://doi.org/10.5395/JKACD.2011.36.1.1