Analysis of residual stress and hardness in regions of pre-manufactured and manual bends in fixation plates for maxillary advancement

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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

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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.



Bone plates, Hardness testing, Maxillary osteotomy

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Oral And Maxillofacial Surgery, v. 19, n. 4, p. 369-373, 2015.