Comparative Dimensional and Microscopic Analysis of the Strength and Hardness of Internal Fixation Plates

• 作者: Danilo Luiz Flumignan Eduardo Sanches Gonçales Eduardo Stedile Fiamoncini Luis Geraldo Vaz Matheus Falsarelli Ferreira Victor Tieghi Neto
• 来源期刊: 口腔学期刊(英文)
• 学科: 工学
• 关键词: Fracture Fixation Internal Biocompatible Materials Compressive Strength
• 年，卷（期）: 2020,（10）
• 页码范围: 310-320
• 页数: 11页
• 分类号: TG1

摘要

The fixation stability achieved with the use of plates and screws in oral and maxillofacial surgery is a decisive factor in treatment success. The mechanical and structural properties of the internal fixation materials have direct influence on the dimensional stability and resistance of a fixation system, thus influencing treatment outcomes. This study proposed to analyze the dimensional and resistance patterns of titanium plates used for obtaining stable fix<span style="font-family:Verdana;">ation in orthognathic surgery and craniofacial trauma. For this study, 30 conventional 2.0</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">mm straight four hole plates with bridge from three brands commercialized in Brazil, were subjected to macroscopic, microscopic, strength and hardness analysis. The dimensional measurements were performed using a digital caliper. Energy-dispersive X-ray spectroscopy analysis was performed by scanning electron microscopy to analyze the chemical composition of the samples. The mechanical resistance tests were performed with a universal testing machine. The samples were then submitted to Vickers hardness analysis, complying with the standards of ASTM E92. The data collected from the dimensional study was submitted to statistical analysis of the coefficient of variation, while the values obtained during the mechanical tests were analyzed by variance (ANOVA) and Tukey’s test (p <</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.05). The sample groups presented different performances in resistance, hardness, size and surface, even though they were reported to be chemically similar compounds that allowed us to conclude the plates from Group 2 were more resistant than groups 1 and 3.</span>