title: Do Mechanical and Physicochemical Properties of Orthodontic NiTi Wires Remain Stable In Vivo?
abstract: Introduction and Aim.Exceptional properties of the NiTi archwires may be jeopardized by the oral cavity; thus its long-term effect on the mechanical and physiochemical properties of NiTi archwires was the aim of work.Material and Methods. Study group comprised sixty 0.016 × 0.022 NiTi archwires from the same manufacturer evaluated (group A) after the first 12 weeks of orthodontic treatment. 30 mm long pieces cut off from each wire prior to insertion formed the control group B. Obeying the strict rules of randomization, all samples were subjected to microscopic evaluation and nanoindentation test.Results.Both groups displayed substantial presence of nonmetallic inclusions. Heterogeneity of the structure and its alteration after usage were found in groups B and A, respectively.Conclusions.Long-term, reliable prediction of biomechanics of NiTi wires in vivo is impossible, especially new archwires from the same vendor display different physiochemical properties. Moreover, manufacturers have to decrease contamination in the production process in order to minimize risk of mutual negative influence of nickel-titanium archwires and oral environment.
authors.affiliation: Department of Dentofacial Orthopedics and Orthodontics, Wroclaw Medical University, Krakowska Street 26, 50-425 Wroclaw, Poland.
authors.forename: Michał
authors.identifier: 0000-0002-2518-0007
authors.initials: M
authors.lastname: Sarul
authors.affiliation: Department of Mechanics, Materials Science and Engineering, Wroclaw University of Technology, Smoluchowskiego Street 25, 50-370 Wroclaw, Poland.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Rutkowska-Gorczyca
authors.affiliation: Department of Mechanics, Materials Science and Engineering, Wroclaw University of Technology, Smoluchowskiego Street 25, 50-370 Wroclaw, Poland.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Detyna
authors.affiliation: Department of Mechanics, Materials Science and Engineering, Wroclaw University of Technology, Smoluchowskiego Street 25, 50-370 Wroclaw, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Zięty
authors.affiliation: Department of Dental Prosthetics, Wroclaw Medical University, Krakowska Street 26, 50-425 Wroclaw, Poland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Kawala
authors.affiliation: Department of Dentofacial Orthopedics and Orthodontics, Wroclaw Medical University, Krakowska Street 26, 50-425 Wroclaw, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Antoszewska-Smith
mesh_terms: D003343:Corrosion; D006801:Humans; D008422:Materials Testing; D009055:Mouth / Q000737:chemistry / Q000187:drug effects; D009532:Nickel / Q000737:chemistry / Q000627:therapeutic use*; D009969:Orthodontic Wires; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry / Q000627:therapeutic use*
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium