Artigo
Analysis of residual stress and hardness in regions of pre-manufactured and manual bends in fixation plates for maxillary advancement
Registro en:
Oral And Maxillofacial Surgery, v. 19, n. 4, p. 369-373, 2015.
1865-1569
10.1007/s10006-015-0504-7
2070995716965558
25944727
Autor
Araújo, Marcelo Marotta [UNESP]
Lauria, Andrezza
Mendes, Marcelo Breno Meneses
Claro, Ana Paula Rosifini Alves [UNESP]
Claro, Cristiane Aparecida de Assis
Moreira, Roger William Fernandes
Resumen
The aim of this study was to analyze, through Vickers hardness test and photoelasticity analysis, pre-bent areas, manually bent areas, and areas without bends of 10-mm advancement pre-bent titanium plates (Leibinger system). The work was divided into three groups: group I-region without bend, group II-region of 90° manual bend, and group III-region of 90° pre-fabricated bends. All the materials were evaluated through hardness analysis by the Vickers hardness test, stress analysis by residual images obtained in a polariscope, and photoelastic analysis by reflection during the manual bending. The data obtained from the hardness tests were statistically analyzed using ANOVA and Tukey's tests at a significance level of 5 %. The pre-bent plate (group III) showed hardness means statistically significantly higher (P < 0.05) than those of the other groups (I-region without bends, II-90° manually bent region). Through the study of photoelastic reflection, it was possible to identify that the stress gradually increased, reaching a pink color (1.81 δ / λ), as the bending was performed. A general analysis of the results showed that the bent plate region of pre-bent titanium presented the best results. Department of Oral and Maxillofacial Surgery, School of Dentistry of São José dos Campos, State University of São Paulo (UNESP), São José dos Campos, SP, Brazil Department of Oral and Maxillofacial Surgery, School of Dentistry of Piracicaba, State University of Campinas (UNICAMP), Av. Limeira, 901, PO Box 52, CEP 13414-903 Piracicaba, SP, Brazil Department of Materials, School of Engineering of Guaratinguetá, State University of São Paulo (UNESP), Guaratinguetá, SP, Brazil Department of Orthodontics, School of Dentistry, University of Taubaté, Taubaté, SP, Brazil Department of Oral and Maxillofacial Surgery, School of Dentistry of Piracicaba, State University of Campinas (UNICAMP), Piracicaba, SP, Brazil Department of Oral and Maxillofacial Surgery, School of Dentistry of São José dos Campos, State University of São Paulo (UNESP), São José dos Campos, SP, Brazil