不同纤维增强剂对临时修复树脂抗弯强度、断裂韧性和耐磨性的影响

Dr. Pratik Bhatnagar
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摘要

目的:评价和比较玻璃纤维、聚乙烯纤维和碳纤维增强PMMA对弯曲强度、断裂韧性和耐磨性的影响。背景:鉴于PMMA的机械和物理特性不足,包括冲击强度低、表面硬度低,导致假体的临床性能降低,本研究旨在研究玻璃、聚乙烯和碳纤维增强PMMA对弯曲强度、断裂韧性和耐磨性的影响。方法和发现:制作矩形试样(n=120;4组各30个;65×10×3.3 mm3),并在万能试验机上加载,直到断裂,以测定弯曲强度和断裂韧性,并在Taber磨料试验机上测定耐磨性。数据采用单因素方差分析,然后采用事后检验-Bonferroni多重比较分析,显著性水平为0.05。在用聚乙烯和碳纤维增强的试样中观察到断裂韧性的显著增加,尽管弯曲强度的值增加不显著。用玻璃和碳纤维增强的试样具有显著低的耐磨性值。结论:玻璃、聚乙烯和碳等非特异性纤维增强PMMA,可显著提高断裂韧性,降低耐磨性。
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Impact of Different Fiber Reinforcement on Flexural Strength, Fracture Toughness and Abrasive Resistance of Provisional Restorative Resin
Aim: To assess and compare the impact of reinforcement of PMMA with glass fibre, polyethylene fibre and carbon fibres on flexural strength, fracture toughness and abrasive resistance. Background: In view of inadequate mechanical and physical characteristics of PMMA which include low impact strength and low surface hardness and resulting lowered clinical performance of the prosthesis, the study was designed to investigate the impact of reinforcement of PMMA with glass, polyethylene and carbon fibers on flexural strength, fracture toughness and abrasive resistance. Methods and Findings: Rectangular specimens (n=120; 30 each from 4 groups; 65 × 10 × 3.3 mm3) were fabricated and loaded on Universal Testing Machine until fracture for flexural strength and fracture toughness and on Taber Abrasive Tester for abrasive resistance. Data were analyzed using one–way ANOVA followed by Post Hoc test - Bonferroni multiple comparison analysis, using significance level of 0.05. Significant increase in fracture toughness was observed in specimens reinforced with polyethylene and carbon fiber, albeit the values of flexural strength were increased insignificantly. Specimens reinforced with glass and carbon fiber had significantly low values of abrasive resistance. Conclusion: Findings indicate that reinforcement of PMMA by non-specific fibers like glass, polyethylene and carbon resulted in significant increase in fracture toughness and decrease in abrasive resistance.
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