The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Effect of friction from differing vertical bracket placement on the force and moment of NiTi wires

브라켓의 수직적 변위에 따른 마찰이 NiTi wire의 힘과 모멘트에 미치는 영향

  • Park, Jea-Beom (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea) ;
  • Yoo, Ji-A (Department of Orthodontics, Seoul St. Mary's Hospital, The Catholic University of Korea) ;
  • Mo, Sung-Seo (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea) ;
  • Choi, Kwang-Cheol ;
  • Kim, Yoon-Ji (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea) ;
  • Han, Seong-Ho (Department of Orthodontics, St. Vincent Hospital, The Catholic University of Korea) ;
  • Kook, Yoon-Ah (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea)
  • 박재범 (가톨릭대학교 임상치과학대학원 교정과) ;
  • 유지아 (가톨릭대학교 서울성모병원 치과교정과) ;
  • 모성서 (가톨릭대학교 임상치과학대학원 치과교정과) ;
  • 최광철 ;
  • 김윤지 (가톨릭대학교 임상치과학대학원 치과교정과) ;
  • 한성호 (가톨릭대학교 성빈센트병원 치과교정과) ;
  • 국윤아 (가톨릭대학교 임상치과학대학원 치과교정과)
  • Received : 2011.03.16
  • Accepted : 2011.06.10
  • Published : 2011.10.30
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Abstract

Objective: The purpose of this study was to evaluate the effect of force and moment produced by Nickel-titanium wires of different sizes at activation and deactivation according to differing vertical bracket displacement. Methods: Superelastic NiTi wires of 3 different sizes (0.014", 0.016", and 0.016" ${\times}$ 0.022") were tied with elastomeric or 0.009-inch stainless steel ligations in a twin-bracket, 0.018-inch slot. A testing machine recorded the effects of simulated activation of 5 distances from 1 to 5 mm and deactivation of 5 distances from 4 to 0 mm, in increments of 1 mm. Results: Frictional force increased the wire stiffness during loading. Ligation of 0.014-inch NiTi wire with O-ring resulted in a significant increase in the stiffness. On application of orthodontic force for 5 mm of vertical displacement of teeth, the effective displacement in the case of the 0.014", 0.016", and 0.016" ${\times}$ 0.022" NiTi wires was 2 mm, 3 mm, and 4 mm, respectively. Conclusions: Our results showed that movement of teeth with large vertical displacement was ineffective because of excessive friction. This finding might contribute to the understanding of the force system required for effective teeth movement and thereby facilitate the application of the appropriate light wire for leveling and alignment.

본 연구는 초탄성 니켈-타이타늄 wire로 수직적 높이 차이가 있는 치아의 leveling 과정을 재현하여 wire의 size와 결찰방법에 따른 force system의 변화를 알아보고 여기에 마찰력의 영향에 대해서 알아보고자 하였다. 브라켓은 0.018" slot의 standard twin bracket을 사용하였으며 교정용 wire는 0.014", 0.016" 그리고 0.016" ${\times}$ 0.022" NiTi를 이용하였고 수직적인 높이는 0에서 5 mm까지 1 mm 간격으로 부하와 탈부하 과정을 실험하여 다음과 같은 결론을 얻었다. 마찰력은 loading 시 wire의 stiffness를 증가시켰으며, 0.014" NiTi를 O-ring 결찰을 한 경우에 현저한 stiffness의 증가를 나타내었다. Light wire (0.014)는 수직적으로 5 mm 변위된 치아의 이동 시 2 mm, 0.016"는 3 mm, 0.016" ${\times}$ 0.022"는 4 mm까지의 이동에 유용한 것으로 분석되었다. 본 연구결과는 수직적 변위가 큰 경우에 light wire조차도 적절한 힘을 발휘하지 않은 것으로 나타났다.

Keywords

References

  1. Reitan K. Some factors determining the evaluation of forces in orthodontics. Am J Orthod Dentofacial Orthop 1957;43:32-45. https://doi.org/10.1016/0002-9416(57)90114-8
  2. Hain M, Dhopatkar A, Rock P. The effect of ligation method on friction in sliding mechanics. Am J Orthod Dentofacial Orthop 2003;123:416-22. https://doi.org/10.1067/mod.2003.14
  3. Frank CA, Nikolai RJ. A comparative study of frictional resistances between orthodontic bracket and arch wire. Am J Orthod 1980;78:593-609. https://doi.org/10.1016/0002-9416(80)90199-2
  4. Pratten DH, Popli K, Germane N, Gunsolley JC. Frictional resistance of ceramic and stainless steel orthodontic brackets. Am J Orthod Dentofacial Orthop 1990;98:398-403. https://doi.org/10.1016/S0889-5406(05)81647-6
  5. Bednar JR, Gruendeman GW, Sandrik JL. A comparative study of frictional forces between orthodontic brackets and arch wires. Am J Orthod Dentofacial Orthop 1991;100:513-22. https://doi.org/10.1016/0889-5406(91)70091-A
  6. Berger JL. The influence of the SPEED bracket's self-ligating design on force levels in tooth movement: a comparative in vitro study. Am J Orthod Dentofacial Orthop 1990;97:219-28. https://doi.org/10.1016/S0889-5406(05)80055-1
  7. Ireland AJ, Sherriff M, McDonald F. Effect of bracket and wire composition on frictional forces. Eur J Orthod 1991;13:322-8. https://doi.org/10.1093/ejo/13.4.322
  8. Sims AP, Waters NE, Birnie DJ, Pethybridge RJ. A comparison of theforces required to produce tooth movement in vitro using two self-ligating brackets and a pre-adjusted bracket employing two types of ligation. Eur J Orthod 1993;15:377-85. https://doi.org/10.1093/ejo/15.5.377
  9. Schumacher HA, Bourauel C, Drescher D. The influence of bracket design on frictional losses in the bracket/arch wire system. J Orofac Orthop 1999;60:335-47. https://doi.org/10.1007/BF01301246
  10. Choi WC, Kim TW, Park JY, Kwak JH, Na HJ, Park DN. The effect of bracket width on frictional force between bracket and arch wire during sliding tooth movement. Korean J Orthod 2004;34:253-60.
  11. Joo HJ, Park YG. Friction of calcium phosphate brackets to stainless steel wire. Korean J Orthod 2007;37:376-85.
  12. Kahlon S, Rinchuse D, Robison JM, Close JM. In-vitro evaluation of frictional resistance with 5 ligation methods and Gianelly-type working wires. Am J Orthod Dentofacial Orthop 2010;138:67-71. https://doi.org/10.1016/j.ajodo.2008.07.023
  13. Reznikov N, Har-Zion G, Barkana I, Abed Y, Redlich M. Measurement of friction forces between stainless steel wires and "reduced-friction" self-ligating brackets. Am J Orthod Dentofacial Orthop 2010;138:330-8. https://doi.org/10.1016/j.ajodo.2008.07.025
  14. Suh CW, Jung HS, Cho JH, Kang KH. Comparison of frictional forces between orthodontic brackets and archwires. Korean J Orthod 2005;35:116-26.
  15. Taylor NG, Ison K. Frictional resistance between orthodontic brackets and archwires in the buccal segments. Angle Orthod 1996;66:215-22.
  16. Jeong HJ, Lim SH, Kim KW. Changes in frictional resistance between stainless steel bracket and various orthodontic wires according to a change in moment. Korean J Orthod 2007;37:137-49.
  17. Je YJ, Chang MH, Lim YK, Lee DY. Evaluation of friction of esthetic brackets according to different bracket-wire angulations. Korean J Orthod 2007;37:341-50.
  18. Burstone CJ, Koenig HA. Creative wire bending--the force system from step and V bends. Am J Orthod Dentofacial Orthop 1988;93:59-67. https://doi.org/10.1016/0889-5406(88)90194-1
  19. Koenig HA, Burstone CJ. Force systems from an ideal arch--large deflection considerations. Angle Orthod 1989;59:11-6.
  20. Heo W, Baek SH. Friction properties according to vertical and horizontal tooth displacement and bracket type during initial leveling and alignment. Angle Orthod 2011;81:653-61. https://doi.org/10.2319/072310-431.1
  21. Meling TR, Odegaard J, Holthe K, Segner D. The effect of friction on the bending stiffness of orthodontic beams: a theoretical and in vitro study. Am J Orthod Dentofacial Orthop 1997;112:41-9. https://doi.org/10.1016/S0889-5406(97)70272-5
  22. Choy KC, Sohn BH. Analysis of force system developed by continuous straight archwire. Korean J Orthod 1996;26:281-90.
  23. Sved A. The application of engineering methods to orthodontics. Am J Orthod Dentofacial Orthop 1952;38:399-421. https://doi.org/10.1016/S0002-9416(52)90128-0
  24. Drenker E. Calculating continuous archwire forces. Angle Orthod 1988;58:59-70.
  25. Rock WP, Wilson HJ. Forces exerted by orthodontic aligning archwires. Br J Orthod 1988;15:255-9. https://doi.org/10.1179/bjo.15.4.255
  26. Burstone CJ, Koenig HA. Force systems from an ideal arch. Am J Orthod 1974;65:270-89. https://doi.org/10.1016/S0002-9416(74)90332-7