dos Reis Andréa Cândido, de Castro Denise Tornavoi, Schiavon Marco Antônio, da Silva Leandro Jardel, Agnelli José Augusto Marcondes
Department of Dental Materials and Prosthesis, Dental School of Ribeirão Preto, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Department of Natural Sciences, GPQM - Research Group of Chemistry Materials, UFSJ - Federal University of São João del Rei, São João del ReiMG, Brazil.
Braz Dent J. 2013 Nov-Dec;24(6):599-604. doi: 10.1590/0103-6440201302263.
The aim of this study was to investigate the influence of accelerated artificial aging (AAA) on the microstructure and mechanical properties of the Filtek Z250, Filtek Supreme, 4 Seasons, Herculite, P60, Tetric Ceram, Charisma and Filtek Z100. composite resins. The composites were characterized by Fourier-transform Infrared spectroscopy (FTIR) and thermal analyses (Differential Scanning Calorimetry - DSC and Thermogravimetry - TG). The microstructure of the materials was examined by scanning electron microscopy. Surface hardness and compressive strength data of the resins were recorded and the mean values were analyzed statistically by ANOVA and Tukey's test (α=0.05). The results showed significant differences among the commercial brands for surface hardness (F=86.74, p<0.0001) and compressive strength (F=40.31, p<0.0001), but AAA did not affect the properties (surface hardness: F=0.39, p=0.53; compressive strength: F=2.82, p=0.09) of any of the composite resins. FTIR, DSC and TG analyses showed that resin polymerization was complete, and there were no differences between the spectra and thermal curve profiles of the materials obtained before and after AAA. TG confirmed the absence of volatile compounds and evidenced good thermal stability up to 200 °C, and similar amounts of residues were found in all resins evaluated before and after AAA. The AAA treatment did not significantly affect resin surface. Therefore, regardless of the resin brand, AAA did not influence the microstructure or the mechanical properties.
本研究的目的是调查加速人工老化（AAA）对Filtek Z250、Filtek Supreme、4 Seasons、Herculite、P60、Tetric Ceram、Charisma和Filtek Z100复合树脂微观结构和力学性能的影响。通过傅里叶变换红外光谱（FTIR）和热分析（差示扫描量热法 - DSC和热重分析法 - TG）对复合材料进行表征。通过扫描电子显微镜检查材料的微观结构。记录树脂的表面硬度和抗压强度数据，并通过方差分析（ANOVA）和Tukey检验（α = 0.05）对平均值进行统计分析。结果表明，各商业品牌在表面硬度（F = 86.74，p < 0.0001）和抗压强度（F = 40.31，p < 0.0001）方面存在显著差异，但AAA并未影响任何复合树脂的性能（表面硬度：F = 0.39，p = 0.53；抗压强度：F = 2.82，p = 0.09）。FTIR、DSC和TG分析表明树脂聚合完全，AAA处理前后材料的光谱和热曲线轮廓没有差异。TG证实不存在挥发性化合物，并证明在高达200°C时具有良好的热稳定性，并且在AAA处理前后评估的所有树脂中发现的残留量相似。AAA处理对树脂表面没有显著影响。因此，无论树脂品牌如何，AAA均不影响微观结构或力学性能。
