title: Degradation of orthodontic wires under simulated cariogenic and erosive conditions.
abstract: This study examined the effect of cariogenic and erosive challenges (CCs and ECs, respectively) on the degradation of copper-nickel-titanium (CuNiTi) orthodontic wires. Sixty wire segments were divided into four treatment groups and exposed to CCs, ECs, artificial saliva, or dry storage (no-treatment control). CC and EC were simulated using a demineralizing solution (pH 4.3) and a citric acid solution (pH 2.3), respectively. Following treatment, the average surface roughness (Ra) of the wires was assessed, and friction between the wires and a passive self-ligating bracket was measured. CuNiTi wires subjected to ECs exhibited significantly higher Ra values than did those that were stored in artificial saliva. In contrast, surface roughness was not affected by CCs. Finally, friction between the treated wires and brackets was not affected by ECs or CCs. Our results indicate that CuNiTi orthodontic wires may suffer degradation within the oral cavity, as ECs increased the surface roughness of these wires. However, rougher surfaces did not increase friction between the wire and the passive self-ligating bracket.
authors.affiliation: Department of Orthodontics, Faculdades São Leopoldo Mandic, Campinas, SP, Brazil.
authors.forename: Laura Cavalcante Lima
authors.initials: LC
authors.lastname: Jaber
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Universidade de Guarulhos, Guarulhos, SP, Brazil.
authors.forename: José Augusto
authors.initials: JA
authors.lastname: Rodrigues
authors.affiliation: Department of Orthodontics, Faculdades São Leopoldo Mandic, Campinas, SP, Brazil.
authors.forename: Flávia Lucisano Botelho
authors.initials: FL
authors.lastname: Amaral
authors.affiliation: Department of Orthodontics, Faculdades São Leopoldo Mandic, Campinas, SP, Brazil.
authors.forename: Fabiana Mantovani Gomes
authors.initials: FM
authors.lastname: França
authors.affiliation: Department of Orthodontics, Faculdades São Leopoldo Mandic, Campinas, SP, Brazil.
authors.forename: Roberta Tarkany
authors.initials: RT
authors.lastname: Basting
authors.affiliation: Department of Orthodontics, Faculdades São Leopoldo Mandic, Campinas, SP, Brazil.
authors.forename: Cecilia Pedroso
authors.initials: CP
authors.lastname: Turssi
mesh_terms: D002326:Cariogenic Agents / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D003343:Corrosion; D017276:Friction; D006801:Humans; D008422:Materials Testing; D018625:Microscopy, Atomic Force; D009532:Nickel / Q000737:chemistry*; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D012464:Saliva, Artificial / Q000737:chemistry*; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D002326:Cariogenic Agents; C415948:Copper NiTi; D012464:Saliva, Artificial; D003300:Copper; D009532:Nickel; D014025:Titanium