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Effect of gastric acids on surface topography and bending properties of esthetic coated nickel-titanium orthodontic archwires

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The purpose of this study was to evaluate the effect of simulated gastric acid solution on surface topography and bending properties of esthetic coated nickel-titanium (NiTi) archwires.

Materials and methods

Three brands of as-received white-coated superelastic NiTi upper archwires were used in this study: Dany, Perfect, and Nitanium. Uncoated metallic areas for each white-coated NiTi archwire were used for comparison with the coated areas. The specimens for each archwire were divided into two groups according to coating as follows: Group A, uncoated, and group B, coated. Then, each group was further subdivided into two subgroups according to the immersion medium as follows: Subgroup 1, immersed in artificial saliva, and subgroup 2, immersed in simulated gastric acid. Surface roughness, surface morphology, and three-point bending test were performed. The data were analyzed statistically using ANOVA and Tukey test.


The archwires immersed in simulated gastric acid solution showed significantly higher surface roughness and lower forces on loading and unloading than the archwires immersed in artificial saliva (P < 0.001). Perfect archwire showed significantly the highest surface roughness compared with Dany and Nitanium archwires (P < 0.001). The uncoated archwires showed higher loading and unloading forces compared with coated archwires for all groups (P < 0.001). Nitanium archwire showed the lowest loading and unloading forces at different deflections (P < 0.001).


The simulated gastric acid solution decreased considerably the amount of force applied at a given deflection. The loading-deflection and surface roughness properties of coated archwires were affected by the type of coating material.

Clinical relevance

The impact of gastric acids on surface and mechanical properties of orthodontic archwires depend on type of coating materials.

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  1. da Silva DL, Mattos CT, Simao RA, de Oliveira Ruellas AC (2013) Coating stability and surface characteristics of esthetic orthodontic coated archwires. Angle Orthod 83:994–1001.

    Article  PubMed  Google Scholar 

  2. Elayyan F, Silikas N, Bearn D (2010) Mechanical properties of coated superelastic archwires in conventional and self-ligating orthodontic brackets. Am J Orthod Dentofac Orthop 137:213–217.

    Article  Google Scholar 

  3. Chng CK, Foong K, Gandedkar NH, Chan YH, Chew CL (2014) A new esthetic fiber-reinforced polymer composite resin archwire: a comparative atomic force microscope (AFM) and field-emission scanning electron microscope (FESEM) study. Prog Orthod 15:39.

    Article  PubMed  PubMed Central  Google Scholar 

  4. Russell JS (2005) Current products and practice. J Orthod 32:146–163.

    Article  PubMed  Google Scholar 

  5. Kaphoor AA, Sundareswaran S (2012) Aesthetic nickel titanium wires--how much do they deliver? Eur J Orthod 34:603–609.

    Article  PubMed  Google Scholar 

  6. da Silva DL, Santos E Jr, Camargo Sde S Jr, Ruellas AC (2015) Infrared spectroscopy, nano-mechanical properties, and scratch resistance of esthetic orthodontic coated archwires. Angle Orthod 85:777–783.

    Article  PubMed  Google Scholar 

  7. Castro SM, Ponces MJ, Lopes JD, Vasconcelos M, Pollmann MCF (2015) Orthodontic wires and its corrosion—the specific case of stainless steel and beta-titanium. J Dent Sci 10:1–7.

    Article  Google Scholar 

  8. Ryu SH, Lim BS, Kwak EJ, Lee GJ, Choi S, Park KH (2015) Surface ultrastructure and mechanical properties of three different white-coated NiTi archwires. Scanning 37:414–421.

    Article  PubMed  Google Scholar 

  9. Elayyan F, Silikas N, Bearn D (2008) Ex vivo surface and mechanical properties of coated orthodontic archwires. Eur J Orthod 30:661–667.

    Article  PubMed  Google Scholar 

  10. Husmann P, Bourauel C, Wessinger M, Jager A (2002) The frictional behavior of coated guiding archwires. J Orofac Orthop 63:199–211.

    Article  PubMed  Google Scholar 

  11. Kusy RP (1997) A review of contemporary archwires: their properties and characteristics. Angle Orthod 67:197–207.

    Article  PubMed  Google Scholar 

  12. Sulaiman TA, Abdulmajeed AA, Shahramian K, Hupa L, Donovan TE, Vallittu P, Narhi TO (2015) Impact of gastric acidic challenge on surface topography and optical properties of monolithic zirconia. Dent Mater 31:1445–1452.

    Article  PubMed  Google Scholar 

  13. Lussi A, Jaeggi T (2008) Erosion--diagnosis and risk factors. Clin Oral Investig 12(Suppl 1):S5–S13.

  14. Dent J, El-Serag HB, Wallander MA, Johansson S (2005) Epidemiology of gastro-oesophageal reflux disease: a systematic review. Gut 54:710–717.

    Article  PubMed  PubMed Central  Google Scholar 

  15. Pace F, Pallotta S, Tonini M, Vakil N, Bianchi Porro G (2008) Systematic review: gastro-oesophageal reflux disease and dental lesions. Aliment Pharmacol Ther 27:1179–1186.

    Article  PubMed  Google Scholar 

  16. Chang JH, Berzins DW, Pruszynski JE, Ballard RW (2014) The effect of water storage on the bending properties of esthetic, fiber-reinforced composite orthodontic archwires. Angle Orthod 84:417–423.

    Article  PubMed  Google Scholar 

  17. Faul F, Erdfelder E, Lang AG, Buchner A (2007) G*Power 3: a flexible statistical power analysis program for the social, behavioral, and biomedical sciences. Behav Res Methods 39:175–191.

    Article  Google Scholar 

  18. Gal JY, Fovet YM, Adib-Yadzi M (2001) About a synthetic saliva for in vitro studies. Talanta 53:1103–1115.

    Article  PubMed  Google Scholar 

  19. Kaneto M, Namura Y, Tamura T, Shimizu N, Tsutsumi Y, Hanawa T, Yoneyama T (2013) Influence of electrolytic treatment time on the corrosion resistance of Ni-Ti orthodontic wire. Dent Mater J 32:305–310.

    Article  PubMed  Google Scholar 

  20. Iijima M, Muguruma T, Brantley W, Choe HC, Nakagaki S, Alapati SB, Mizoguchi I (2012) Effect of coating on properties of esthetic orthodontic nickel-titanium wires. Angle Orthod 82:319–325.

    Article  PubMed  Google Scholar 

  21. Segal N, Hell J, Berzins DW (2009) Influence of stress and phase on corrosion of a superelastic nickel-titanium orthodontic wire. Am J Orthod Dentofac Orthop 135:764–770.

    Article  Google Scholar 

  22. Washington B, Evans CA, Viana G, Bedran-Russo A, Megremis S (2015) Contemporary esthetic nickel-titanium wires: do they deliver the same forces? Angle Orthod 85:95–101.

    Article  PubMed  Google Scholar 

  23. ISO (2006) Dentistry- wires for use in orthodontics. ISO 15841. ISO 15841; Geneva

  24. Katić V, Mandić V, Ježek D, Baršić G, Špalj S (2015) Influence of various fluoride agents on working properties and surface characteristics of uncoated, rhodium coated and nitrified nickel-titanium orthodontic wires. Acta Odontol Scand 73:241–249.

    Article  PubMed  Google Scholar 

  25. Gold BD (2004) Gastroesophageal reflux disease: could intervention in childhood reduce the risk of later complications? Am J Med 117(Suppl 5A):S23–S29.

    Article  Google Scholar 

  26. Linnett V, Seow WK, Connor F, Shepherd R (2002) Oral health of children with gastro-esophageal reflux disease: a controlled study. Aust Dent J 47:156–162.

    Article  PubMed  Google Scholar 

  27. Marques LS, Rey AC, Torres SR (2007) Dental demineralization associated with gastroesophageal reflux in an orthodontic patient. Am J Orthod Dentofac Orthop 131:782–784.

    Article  Google Scholar 

  28. Bradley TG, Brantley WA, Culbertson BM (1996) Differential scanning calorimetry (DSC) analyses of superelastic and nonsuperelastic nickel-titanium orthodontic wires. Am J Orthod Dentofac Orthop 109:589–597.

    Article  Google Scholar 

  29. Brantley W, Berzins D, Iijima M, Tufekçi E, Cai Z (2017) Structure/property relationships in orthodontic alloys. In: Eliades T, Brantley WA (eds) Orthodontic Applications of Biomaterials. Woodhead Publishing, pp 3–38.

  30. Choi S, Lee S, Cheong Y, Park KH, Park HK, Park YG (2012) Ultrastructural effect of self-ligating bracket materials on stainless steel and superelastic NiTi wire surfaces. Microsc Res Tech 75:1076–1083.

    Article  PubMed  Google Scholar 

  31. Wichelhaus A, Geserick M, Hibst R, Sander FG (2005) The effect of surface treatment and clinical use on friction in NiTi orthodontic wires. Dent Mater 21:938–945.

    Article  PubMed  Google Scholar 

  32. Segner D, Ibe D (1995) Properties of superelastic wires and their relevance to orthodontic treatment. Eur J Orthod 17:395–402.

    Article  PubMed  Google Scholar 

  33. Walker MP, White RJ, Kula KS (2005) Effect of fluoride prophylactic agents on the mechanical properties of nickel-titanium-based orthodontic wires. Am J Orthod Dentofac Orthop 127:662–669.

    Article  Google Scholar 

  34. da Silva DL, Mattos CT, Sant’ Anna EF, Ruellas AC, Elias CN (2013) Cross-section dimensions and mechanical properties of esthetic orthodontic coated archwires. Am J Orthod Dentofac Orthop 143:S85–S91.

    Article  Google Scholar 

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Correspondence to Shaymaa Elsaka.

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Elsaka, S., Hassan, A. & Elnaghy, A. Effect of gastric acids on surface topography and bending properties of esthetic coated nickel-titanium orthodontic archwires. Clin Oral Invest 25, 1319–1326 (2021).

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