Araújo Marcelo Marotta, Lauria Andrezza, Mendes Marcelo Breno Meneses, Claro Ana Paula Rosifini Alves, Claro Cristiane Aparecida de Assis, Moreira Roger William Fernandes
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.
Oral Maxillofac Surg. 2015 Dec;19(4):369-73. doi: 10.1007/s10006-015-0504-7. Epub 2015 May 6.
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.
本研究的目的是通过维氏硬度测试和光弹性分析，对10毫米推进预弯钛板（莱宾格系统）的预弯区域、手动弯曲区域和无弯曲区域进行分析。研究工作分为三组：第一组为无弯曲区域，第二组为90°手动弯曲区域，第三组为90°预制弯曲区域。所有材料均通过维氏硬度测试进行硬度分析、通过在偏光镜中获得的残余图像进行应力分析以及在手动弯曲过程中通过反射进行光弹性分析。从硬度测试中获得的数据使用方差分析和Tukey检验进行统计分析，显著性水平为5%。预弯板（第三组）的硬度平均值在统计学上显著高于其他组（第一组无弯曲区域、第二组90°手动弯曲区域）（P < 0.05）。通过光弹性反射研究，可以确定随着弯曲的进行，应力逐渐增加，达到粉红色（1.81δ/λ）。对结果的总体分析表明，预弯钛板的弯曲区域呈现出最佳结果。
