title: Effect of heat treatment on stainless steel orthodontic wires.
abstract: This study evaluated the effect of heat treatment on CrNi stainless steel orthodontic archwires. Half of forty archwires of each thickness - 0.014" (0.35 mm), 0.016" (0.40 mm), 0.018" (0.45 mm) and 0.020" (0.50 mm) (totalling 160 archwires) - were subjected to heat treatment while the remainder were not. All of the archwires had their individual thickness measured in the anterior and posterior regions using AutoCad 2000 software before and after compressive and tensile strength testing. The data was statistically analysed utilising multivariance ANOVA at a 5% significance level. All archwires without heat treatment that were subjected to tensile strength testing presented with anterior opening, which was more accentuated in the 0.020" archwires. In the posterior region, the opening produced by the tensile force was more accentuated in the archwires without heat treatment. There was greater stability in the thermally treated archwires, especially those subjected to tensile strength testing, which indicates that the heat treatment of orthodontic archwires establishes a favourable and indispensable condition to preserve the intercanine width.
authors.affiliation: Department of Pediatric and Community Dentistry, Faculdade de Odontologia de Araçatuba, Unesp, Araçatuba, SP, Brazil.
authors.forename: Osmar Aparecido
authors.initials: OA
authors.lastname: Cuoghi
authors.forename: Geraldo Francisco
authors.initials: GF
authors.lastname: Kasbergen
authors.forename: Paulo Henrique dos
authors.initials: PH
authors.lastname: Santos
authors.forename: Marcos Rogério de
authors.initials: MR
authors.lastname: Mendonça
authors.forename: Pedro Marcelo
authors.initials: PM
authors.lastname: Tondelli
mesh_terms: D000704:Analysis of Variance; D019245:Compressive Strength; D006358:Hot Temperature; D008422:Materials Testing; D055595:Mechanical Phenomena; D009969:Orthodontic Wires; D013193:Stainless Steel; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D013193:Stainless Steel