대한치과교정학회지 (The korean journal of orthodontics)

  • 제48권6호
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  • Pages.384-394
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  • 2018
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  • 2234-7518(pISSN)
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  • 2005-372X(eISSN)
대한치과교정학회 (The Korean Association Of Orthodontists)
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Effects of prestretch on stress relaxation and permanent deformation of orthodontic synthetic elastomeric chains

  • Chang, Jee Hae (Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Hwang, Chung-Ju (Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Kim, Kyung-Ho (Institute of Craniofacial Deformity, College of Dentistry, Yonsei University) ;
  • Cha, Jung-Yul (Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Kim, Kwang-Mahn (Department and Research Institute of Dental Biomaterials and Bioengineering, College of Dentistry, Yonsei University) ;
  • Yu, Hyung Seog (Department of Orthodontics, College of Dentistry, Yonsei University)
  • 투고 : 2017.11.08
  • 심사 : 2018.04.02
  • 발행 : 2018.11.01
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초록

Objective: This study was performed to investigate an appropriate degree of prestretch for orthodontic synthetic elastomeric chains focusing on time-dependent viscoelastic properties. Methods: Orthodontic synthetic elastomeric chains of two brands were prestretched to 50, 100, 150, and 200% of the original length in one and three cycles, and the hysteresis areas of the obtained stress-strain curves were determined. Acrylic plates were employed to maintain constant strain during the experiment. A total of 180 samples were classified into nine groups according to brand, and their stresses and permanent deformations were measured immediately after prestretch (0 hour), after 1 hour and 24 hours, and after 1, 2, 3, 4, 5, 6, 7, and 8 weeks. The relationship between stress relaxation and permanent deformation was investigated for various degrees of prestretch, and the estimated stress resulting from tooth movement was calculated. Results: The degree of prestretch and the stress relaxation ratio exhibited a strong negative correlation, whereas no correlation was found between the degree of prestretch and the average normalized permanent strain. The maximal estimated stress was observed when prestretch was performed in three cycles to 200% of the original length. Conclusions: Although prestretch benefited residual stress, it did not exhibit negative effects such as permanent deformation. The maximal estimated stress was observed at the maximal prestretch, but the difference between prestretch and control groups decreased with time. In general, higher residual stresses were observed for product B than for product A, but this difference was not clinically significant.

키워드

참고문헌

  1. Halimi A, Benyahia H, Doukkali A, Azeroual MF, Zaoui F. A systematic review of force decay in orthodontic elastomeric power chains. Int Orthod 2012;10:223-40.
  2. Andreasen GF, Bishara S. Comparison of alastik chains with elastics involved with intra-arch molar to molar forces. Angle Orthod 1970;40:151-8.
  3. Brantley WA, Salander S, Myers CL, Winders RV. Effects of prestretching on force degradation characteristics of plastic modules. Angle Orthod 1979;49:37-43.
  4. Wong AK. Orthodontic elastic materials. Angle Orthod 1976;46:196-205.
  5. Chang HF. Effects of instantaneous prestretching on force degradation characteristics of orthodontic plastic modules. Proc Natl Sci Counc Repub China B 1987;11:45-53.
  6. von Fraunhofer JA, Coffelt MT, Orbell GM. The effects of artificial saliva and topical fluoride treatments on the degradation of the elastic properties of orthodontic chains. Angle Orthod 1992;62:265-74.
  7. Stevenson JS, Kusy RP. Force application and decay characteristics of untreated and treated polyurethane elastomeric chains. Angle Orthod 1994;64:455-64;discussion 465-7.
  8. Kim KH, Chung CH, Choy K, Lee JS, Vanarsdall RL. Effects of prestretching on force degradation of synthetic elastomeric chains. Am J Orthod Dentofacial Orthop 2005;128:477-82. https://doi.org/10.1016/j.ajodo.2004.04.027
  9. Leung VWH, Darvell BW. Calcium phosphate system in saliva-like media. J Chem Soc-Faraday Trans 1991;87:1759-64. https://doi.org/10.1039/ft9918701759
  10. Yagura D, Baggio PE, Carreiro LS, Takahashi R. Deformation of elastomeric chains related to the amount and time of stretching. Dental Press J Orthod 2013;18:136-42. https://doi.org/10.1590/S2176-94512013000300022
  11. De Genova DC, McInnes-Ledoux P, Weinberg R, Shaye R. Force degradation of orthodontic elastomeric chains--a product comparison study. Am J Orthod 1985;87:377-84. https://doi.org/10.1016/0002-9416(85)90197-6
  12. Taloumis LJ, Smith TM, Hondrum SO, Lorton L. Force decay and deformation of orthodontic elastomeric ligatures. Am J Orthod Dentofacial Orthop 1997;111:1-11. https://doi.org/10.1016/S0889-5406(97)70295-6
  13. Storey EE, Smith R. Force in orthodontics and its relation to tooth movement. Aust J Dent 1952;56:11-8.
  14. 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
  15. Lu TC, Wang WN, Tarng TH, Chen JW. Force decay of elastomeric chain--a serial study. Part II. Am J Orthod Dentofacial Orthop 1993;104:373-7. https://doi.org/10.1016/S0889-5406(05)81336-8
  16. Young J, Sandrik JL. The influence of preloading on stress relaxation of orthodontic elastic polymers. Angle Orthod 1979;49:104-9.
  17. Song HS, Kim SC. A study on the biomechanical properties of orthodontic rubber elastic materials. Korean J Orthod 1991;21:563-80.
  18. Kochenborger C, Silva DLd, Marchioro EM, Vargas DA, Hahn L. Assessment of force decay in orthodontic elastomeric chains: an in vitro study. Dent Press J Orthod 2011;16:93-9. https://doi.org/10.1590/S2176-94512011000600015
  19. Baty DL, Storie DJ, von Fraunhofer JA. Synthetic elastomeric chains: a literature review. Am J Orthod Dentofacial Orthop 1994;105:536-42. https://doi.org/10.1016/S0889-5406(94)70137-7
  20. Bishara SE, Andreasen GF. A comparison of time related forces between plastic alastiks and latex elastics. Angle Orthod 1970;40:319-28.
  21. Boester CH, Johnston LE. A clinical investigation of the concepts of differential and optimal force in canine retraction. Angle Orthod 1974;44:113-9.
  22. Lim HC, Lim SH. Comparison of physical characteristics of elastomeric chains. Oral Biol Res 2011;35:22-9. https://doi.org/10.21851/obr.35.1.201103.22
  23. Yee JA, Turk T, Elekdag-Turk S, Cheng LL, Darendeliler MA. Rate of tooth movement under heavy and light continuous orthodontic forces. Am J Orthod Dentofacial Orthop 2009;136:150.e1-9; discussion 150-1.
  24. Hershey HG, Reynolds WG. The plastic module as an orthodontic tooth-moving mechanism. Am J Orthod 1975;67:554-62. https://doi.org/10.1016/0002-9416(75)90300-0

피인용 문헌

  1. Physical behavior of pre-strained thermoset and thermoplastic orthodontic chains vol.40, pp.3, 2021, https://doi.org/10.4012/dmj.2020-192