Current Osteoporosis Reports

, Volume 16, Issue 4, pp 380–386 | Cite as

Review of Superelastic Differential Force Archwires for Producing Ideal Orthodontic Forces: an Advanced Technology Potentially Applicable to Orthognathic Surgery and Orthopedics

  • Michael L. KuntzEmail author
  • Ryan Vadori
  • M. Ibraheem Khan
Craniofacial Skeleton (WE Roberts, Section Editor)
Part of the following topical collections:
  1. Topical Collection on Craniofacial Skeleton


Purpose of Review

Gentle and continuous loads are preferred for optimum orthodontic tooth movement. Nitinol, an alloy of nickel and titanium developed for the aerospace industry, found its first clinical applications in orthodontics because it has ideal load-deflection behavior. The purpose of this review is to elucidate the criteria for effective orthodontic mechanics relative to emerging Nitinol technology. The specialized materials with variable stiffness that were originally developed for orthodontics are increasingly attractive for in the temporomandibular joint, orthognathic surgery, and orthopedics.

Recent Findings

The evolution of orthodontic archwires is driven by a need to achieve low load-deflection characteristics and Nitinol is the alloy of choice. Scientific knowledge of the biological response to orthodontic forces continues to grow, but definitive guidance on optimal force levels for individual teeth is elusive. Finite element models (FEM) that take into account periodontal ligament (PDL) stresses indicate differential force archwires are needed to realize optimal treatment. However, previous wire fabrication methods, including welding of different materials and selective resistive heating, are limited by poor mechanical performance and spatial resolution. Recently, a novel laser processing technique was developed for precisely programing relative levels of stiffness in a single archwire. FEM was used to estimate the optimal force for each tooth by calculating the 3D bone-PDL surface area.


There remains a general consensus that light and continuous forces are desirable for orthodontic treatment. New developments in archwire materials and technology have provided the orthodontist with a complete spectrum of load-deflection rates and differential force options to express these forces with maximized archwire economy. These technologies also appear to have application to orthopedic implant devices.


Orthodontic archwires Superelastic Nitinol Shape memory alloy Laser processing 


Compliance with Ethical Standards

Conflict of Interest

Ibraheem Khan has a patent (US20170224444A1) pending, and Smarter Alloys Inc. (with which all authors are affiliated) is involved in the design and manufacture of appliances for orthodontic treatment.

Human and Animal Rights and Informed Consent

This article does not contain any studies with human or animal subjects performed by any of the authors.


Papers of particular interest, published recently, have been highlighted as: • Of importance •• Of major Importance

  1. 1.
    Storey E, Smith R. Force in orthodontics and its relation to tooth movement. Aust J Dent. 1952;56:291–304.Google Scholar
  2. 2.
    Roberts WE, Sarandeep SH. Bone physiology, metabolism, and biomechanics in orthodontic practice. In: Graber LW, Vanarsdall RL, KWL V, Huang GJ, editors. Orthodontics: current principles and techniques. 6th ed. Oxford: Elsevier Health Sciences; 2016. p. 99–152.Google Scholar
  3. 3.
    Reitan K. Clinical and histologic observations on tooth movement during and after orthodontic treatment. Am J Orthod. 1967;53:721–45.CrossRefPubMedPubMedCentralGoogle Scholar
  4. 4.
    Begg PR. Differential force in orthodontic treatment. Am J Orthod. 1956;42:481–510.CrossRefGoogle Scholar
  5. 5.
    Burstone CJ, Baldwin JJ, Lawless DT. The application of continuous forces to orthodontics. Angle Orthod. 1961;31:1–14.Google Scholar
  6. 6.
    Harder OE, Roberts DA. Alloy having high elastic strengths. US Patent 2,524,661. 1950.Google Scholar
  7. 7.
    Buehler WJ, Gilfrich JV, Wiley RC. Effect of low-temperature phase changes on the mechanical properties of alloys near composition TiNi. J Appl Phys. 1963;34:1475–7.CrossRefGoogle Scholar
  8. 8.
    Pelton AR, Duerig TW, Stockel D. A guide to shape memory and superelasticity in Nitinol medical devices. Minim Invasive Ther Allied Technol. 2004;13:218–21.CrossRefPubMedGoogle Scholar
  9. 9.
    Duerig TW, Pelton A, Stöckel D. An overview of nitinol medical applications. Mater Sci Eng A. 1999;273:149–60.CrossRefGoogle Scholar
  10. 10.
    Andreasen GF, Hilleman TB. An evaluation of 55 cobalt substituted nitinol wire for orthodontics. J Am Dent Assoc. 1971;82:1373–5.CrossRefPubMedGoogle Scholar
  11. 11.
    Andreasen GF, Barrett RD. An evaluation of cobalt-substituted nitinol wire in orthodontics. Am J Orthod. 1973;63:462–70.CrossRefPubMedGoogle Scholar
  12. 12.
    Andreasen GF, Morrow RE. Laboratory and clinical analyses of nitinol wire. Am J Orthod. 1978;73:142–51.CrossRefPubMedGoogle Scholar
  13. 13.
    Miura F, Mogi M, Ohura Y. Japanese NiTi alloy wire: use of the direct electric resistance heat treatment method. Eur J Orthod. 1988;10:187–91.CrossRefPubMedGoogle Scholar
  14. 14.
    Robertson SW, Pelton AR, Ritchie RO. Mechanical fatigue and fracture of Nitinol. Int Mater Rev. 2012;57(1):1–36.CrossRefGoogle Scholar
  15. 15.
    Andrews LF. The six keys to normal occlusion. Am J Orthod. 1972;62:296–309.CrossRefPubMedGoogle Scholar
  16. 16.
    Burstone CJ, Morton JY. Chinese NiTi wire—a new orthodontic alloy. Am J Orthod. 1985;87:445–52.CrossRefPubMedGoogle Scholar
  17. 17.
    Miura F, Mogi M, Ohura Y, Hamanaka H. The super-elastic property of the Japanese NiTi alloy wire for use in orthodontics. Am J Orthod Dentofac Orthop. 1986;90:1–10.CrossRefGoogle Scholar
  18. 18.
    Gil FJ, Planell JA. In vitro thermomechanical ageing of Ni-Ti alloys. J Biomater Appl. 1998;12:237–48.CrossRefPubMedGoogle Scholar
  19. 19.
    Gil FJ, Planell JA. Effect of copper addition on the superelastic behavior of Ni-Ti shape memory alloys for orthodontic applications. J Biomed Mater Res. 1999;48:682–8.CrossRefPubMedGoogle Scholar
  20. 20.
    Goldberg J, Burstone CJ. An evaluation of beta titanium alloys for use in orthodontic appliances. J Dent Res. 1979;58:593–600.CrossRefPubMedGoogle Scholar
  21. 21.
    Burstone CJ, Goldberg AJ. Beta titanium: a new orthodontic alloy. Am J Orthod. 1980;77:121–32.CrossRefPubMedGoogle Scholar
  22. 22.
    Dalstra M, Denes G, Melsen B. Titanium-niobium, a new finishing wire alloy. Clin Orthod Res. 2000;3:6–14.CrossRefPubMedGoogle Scholar
  23. 23.
    Suzuki A, Kanetaka H, Shimizu Y, Tomizuka R, Hosoda H, Miyazaki S, et al. Orthodontic buccal tooth movement by nickel-free titanium-based shape memory and superelastic alloy wire. Angle Orthod. 2006;76:1041–6.CrossRefPubMedGoogle Scholar
  24. 24.
    Saito T, Furuta T, Hwang J-H, Kuramoto S, Nishino K, Suzuki N, et al. Multifunctional alloys obtained via a dislocation-free plastic deformation mechanism. Science. 2003;300:464–7.CrossRefPubMedGoogle Scholar
  25. 25.
    Chang H-P, Tseng Y-C. A novel β-titanium alloy orthodontic wire. Kaohsiung J Med Sci. 2018. In press;34:202–6.CrossRefPubMedGoogle Scholar
  26. 26.
    Laino G, De Santis R, Gloria A, Russo T, Quintanilla DS, Laino A, et al. Calorimetric and thermomechanical properties of titanium-based orthodontic wires: DSC-DMA relationship to predict the elastic modulus. J Biomater Appl. 2012;26:829–44.CrossRefPubMedGoogle Scholar
  27. 27.
    Coro JC, Coro IM. Nonsurgical treatment of class III malocclusions using the multi-loop edgewise archwire appliance. In: 2012. Accessed 06 April 2018.
  28. 28.
    Nordstrom B, Shoji T, Anderson WC, Fields HW, Beck FM, Kim D-G, et al. Comparison of changes in irregularity and transverse width with nickel-titanium and niobium-titanium-tantalum-zirconium archwires during initial orthodontic alignment in adolescents: a double-blind randomized clinical trial. Angle Orthod. 2018. In press;88:348–54.CrossRefPubMedGoogle Scholar
  29. 29.
    Quinn RS, Yoshikawa DK. A reassessment of force magnitude in orthodontics. Am J Orthod. 1985;88:252–60.CrossRefPubMedGoogle Scholar
  30. 30.
    Owman-Moll P, Kurol J, Lundgren D. The effects of a four-fold increased orthodontic force magnitude on tooth movement and root resorptions. An intra-individual study in adolescents. Eur J Orthod. 1996;18:287–94.CrossRefPubMedGoogle Scholar
  31. 31.
    Kilic N, Oktay H, Ersoz M. Effects of force magnitude on tooth movement: an experimental study in rabbits. Eur J Orthod. 2010;32:154–8.CrossRefPubMedGoogle Scholar
  32. 32.
    Limsiriwong S, Khemaleelakul W, Sirabanchongkran S, Pothacharoen P, Kongtawelert P, Ongchai S, et al. Biochemical and clinical comparisons of segmental maxillary posterior tooth distal movement between two different force magnitudes. Eur J Orthod. 2017:1–8.Google Scholar
  33. 33.
    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 Dentofac Orthop. 2009;136:150–1.CrossRefGoogle Scholar
  34. 34.
    Ren Y, Maltha JC, Van’t Hof MA, Kuljpers-Jagtman AM. Optimum force magnitude for orthodontic tooth movement: a mathematical model. Am J Orthod Dentofac Orthop. 2004;125:71–7.CrossRefGoogle Scholar
  35. 35.
    Alikhani M, Alyami B, Lee IS, Almoammar S, Vongthongleur T, Alikhani M, et al. Saturation of the biological response to orthodontic forces and its effect on the rate of tooth movement. Orthod Craniofacial Res. 2015;18 Suppl 1:8–17.CrossRefGoogle Scholar
  36. 36.
    Melsen B, Cattaneo PM, Dalstra M, Kraft DC. The importance of force levels in relation to tooth movement. Semin Orthod. 2007;13:220–33.CrossRefGoogle Scholar
  37. 37.
    • Viecilli RF, Burstone CJ. Ideal orthodontic alignment load relationships based on periodontal ligament stress. Orthod Craniofacial Res. 2015;18:180–6. Identified the proportional load relationships between teeth required for equalizing stress in the periodontal ligature. CrossRefGoogle Scholar
  38. 38.
    Savignano R, Viecilli RF, Paoli A, Razionale AV, Barone S. Nonlinear dependency of tooth movement on force system directions. Am J Orthod Dentofac Orthop. 2016;149(6):838–46.CrossRefGoogle Scholar
  39. 39.
    Razali MF, Mahmud AS, Mokhtar N. Force delivery of NiTi orthodontic arch wire at different magnitude of deflections and temperatures: a finite element study. J Mech Behav Biomed Mater. 2018;77:234–41.CrossRefPubMedGoogle Scholar
  40. 40.
    Burstone CJ. Rationale of the segmented arch. Am J Orthod. 1962;48:805–22.CrossRefPubMedGoogle Scholar
  41. 41.
    Burstone CJ. Variable-modulus orthodontics. Am J Orthod. 1981;80:1–16.CrossRefPubMedGoogle Scholar
  42. 42.
    Sevilla P, Martorell F, Libenson C, Planell JA, Gil FJ. Laser welding of NiTi orthodontic archwires for selective force application. J Mater Sci Mater Med. 2008;19:525–9.CrossRefPubMedGoogle Scholar
  43. 43.
    Li Q, Zhu Y. Impact butt welding of NiTi and stainless steel—an examination of impact speed effect. J Mater Process Technol. 2018;255:434–42.CrossRefGoogle Scholar
  44. 44.
    Matsunaga J, Watanabe I, Nakao N, Watanabe E, Elshahawy W, Yoshida N. Joining characteristics of titanium-based orthodontic wires connected by laser and electrical welding methods. J Mater Sci Mater Med. 2015;26:50.CrossRefGoogle Scholar
  45. 45.
    Miura F. Orthodontic archwire. US Patent 5,017,133. 1991.Google Scholar
  46. 46.
    Gil FJ, Cenizo M, Espinar E, Rodriguez A, Ruperez E, Manero JM. NiTi superelastic orthodontic wires with variable stress obtained by ageing treatments. Mater Lett. 2013;104:5–7.CrossRefGoogle Scholar
  47. 47.
    Sachdeva R, Farzin-Nia F. Shape memory orthodontic archwire having variable recovery stresses. US Patent 5,683,245. 1997.Google Scholar
  48. 48.
    Mehta ASK. Thermomechanical characterization of variable force NiTi orthodontic archwires. Master’s Thesis. Marquette University. 2015. Accessed 06 April 2018.
  49. 49.
    •• Khan MI, Pequegnat A, Zhou YN. Multiple memory shape memory alloys. Adv Eng Mater. 2013;15:386–93. Introduced a novel method for varying the mechanical properties of nickel-titanium-based shape memory materials for biomedical applications with very fine spatial resolution. CrossRefGoogle Scholar
  50. 50.
    Roberts WE, Viecilli RF, Chang C, Katona TR, Paydar NH. Biology of biomechanics: finite element analysis of a statically determinate system to rotate the occlusal plane for correction of skeletal class III malocclusion. Am J Orthod Dentofac Orthop. 2015;148:943–55.CrossRefGoogle Scholar
  51. 51.
    Schmerling MA, Wilkov MA, Sanders AE. Using the shape recovery of Nitinol in the Harrington rod treatment of scoliosis. J Biomed Mater Res. 1976;10:879–92.CrossRefPubMedGoogle Scholar
  52. 52.
    Sanchez Marquez JM, Perez-Grueso FJS, Fernandez-Baillo N, Garay EG. Gradual scoliosis correction over time with shape memory metal: a preliminary report of an experimental study. Scoliosis. 2012;7:20.CrossRefPubMedPubMedCentralGoogle Scholar
  53. 53.
    Norlin R. Use of Mitek anchoring for Bankart repair: a comparative, randomized, prospective study with traditional bone sutures. J Shoulder Elb Surg. 1994;3:381–5.CrossRefGoogle Scholar
  54. 54.
    Richmond JC, Donaldson WR, Fu F, Harner CD. Modification of the Bankart reconstruction with a suture anchor. Am J Sports Med. 1991;19:343–6.CrossRefPubMedGoogle Scholar
  55. 55.
    Wolford LM. Temporomandibular joint devices: treatment factors and outcomes. Oral Surg Oral Med Oral Pathol. 1997;83:143–8.CrossRefGoogle Scholar
  56. 56.
    Mehra P, Wolford LM. The Mitek mini anchor for TMJ disc repositioning: surgical technique and results. Int J Oral Maxillofac Surg. 2001;30:497–503.CrossRefPubMedGoogle Scholar
  57. 57.
    Ivorra-Carbonell L, Montiel-Company J-M, Almerich Silla J-M, Paredes-Gallardo V, Bellot-Arcis C. Impact of functional mandibular advancement appliances on the temporomandibular joint—a systematic review. Med Oral Patol Oral Cir Bucal. 2016;21:e565–72.PubMedPubMedCentralGoogle Scholar
  58. 58.
    Rigal J, Thelen T, Angelliaume A, Pontailler J-R, Lefevre Y. A new procedure for fractures of the medial epicondyle in children: Mitek bone suture anchor. Orthop Traumatol Surg Res. 2016;102:117–20.CrossRefPubMedGoogle Scholar
  59. 59.
    Russell SM. Design considerations for Nitinol bone staples. J Mater Eng Perform. 2009;18:831–5.CrossRefGoogle Scholar
  60. 60.
    Aiyer A, Russell NA, Pelletier MH, Myerson M, Walsh WR. The impact of Nitinol staples on the compressive forces, contact area, and mechanical properties in comparison to a claw plate and crossed screws for the first tarsometatarsal arthrodesis. Foot Ankle Int. 2016;9:232–40.Google Scholar
  61. 61.
    Hoon QJ, Pelletier MH, Christou C, Johnson KA, Walsh WR. Biomechanical evaluation of shape-memory alloy staples for internal fixation—an in vitro study. J Exp Orthop. 2016;3:19.CrossRefPubMedPubMedCentralGoogle Scholar
  62. 62.
    Schipper ON, Ford SE, Moody PW, Van Doren B, Ellington JK. Radiographic results of Nitinol compression staples for hindfoot and midfoot arthrodesis. Foot Ankle Int. 2018;39:172–9.CrossRefPubMedGoogle Scholar
  63. 63.
    Saleeb AF, Dhakal B, Owusu-Danquah JS. Assessing the performance characteristics and clinical forces in simulated shape memory bone staple surgical procedure: the significance of SMA material model. Comput Biol Med. 2015;62:185–95.CrossRefPubMedGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Michael L. Kuntz
    • 1
    Email author
  • Ryan Vadori
    • 1
  • M. Ibraheem Khan
    • 1
  1. 1.Smarter Alloys Inc.WaterlooCanada

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