To evaluate properties of fiber-reinforced-composites (FRC) containing Bis-EMA/UDMA monomers but identical dispersed phase (60% wt BaSi glass power +10% wt E-glass fibre). A control (Group A), monomer mixture comprising 60% Bis-GMA, 30% TEGDMA, and 10% PMMA (typical FRC monomers) was used. The following monomer mass fractions were mixed: 50% bis-GMA plus 50% of different ratios of Bis-EMA+UDMA to produce consistent formulations (Groups B-E) of workable viscosities was also studied. Flexural strength (FS), fracture toughness (K), water sorption (SP), solubility (SL) and hygroscopic expansion (HE) were measured. FS and K specimens were stored for 1, 7 d, and 30 d in water at 37 °C. SP/SL specimens were water-immersed for 168d, weighed at intervals, then dried for 84 d at 37 °C. To analyze differences in FS, and K, a two-way ANOVA and Tukey post-hoc tests (α = 0.05) were conducted. For SP/SL, and HE, one-way ANOVA with subsequent Tukey post-hoc tests (α = 0.05) were utilized. FS and K for groups A, D, E decreased progressively after 1 d. Groups B and C (highest amounts of Bis-EMA) did not decrease significantly. The modified matrix composites performed significantly better than the control group for SP and HE. The control group outperformed the experimental composites only for SL with up to 250% higher SL for group E (6.9 μg/mm) but still below the maximum permissible threshold of 7.5 μg/mm. Significance: composites with highest amounts of Bis-EMA showed improved hydrolytic stability and overall enhancement in several clinically-relevant properties. This makes them potential candidates for alternative matrices to a semi-interpenetrating network in fiber-reinforced composites.

中文翻译：

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不同基体单体比例的无碱玻璃纤维复合材料模型的性能

评估含有 Bis-EMA/UDMA 单体但具有相同分散相（60% wt BaSi 玻璃粉+10% wt E-玻璃纤维）的纤维增强复合材料 (FRC) 的性能。使用包含 60% Bis-GMA、30% TEGDMA 和 10% PMMA（典型 FRC 单体）的单体混合物作为对照（A 组）。还研究了混合以下单体质量分数：50% bis-GMA 加 50% 不同比例的 Bis-EMA+UDMA，以产生适用粘度一致的配方（BE 组）。测量弯曲强度（FS）、断裂韧性（K）、吸水性（SP）、溶解度（SL）和吸湿膨胀（HE）。FS 和 K 样本在 37 °C 水中保存 1、7 d 和 30 d。SP/SL试样水浸168d，每隔一段时间称重，然后在37℃下干燥84d。为了分析 FS 和 K 的差异，进行了双向方差分析和 Tukey 事后检验 (α = 0.05)。对于 SP/SL 和 HE，使用单向方差分析和随后的 Tukey 事后检验 (α = 0.05)。A、D、E组的FS和K在1天后逐渐下降。B 组和 C 组（Bis-EMA 含量最高）没有显着下降。改性后的基体复合材料在 SP 和 HE 方面的表现明显优于对照组。对照组仅在 SL 方面优于实验复合材料，E 组的 SL (6.9 μg/mm) 高出 250%，但仍低于最大允许阈值 7.5 μg/mm。意义：Bis-EMA 含量最高的复合材料表现出更高的水解稳定性，并且在一些临床相关特性方面得到全面增强。这使得它们成为纤维增强复合材料中半互穿网络替代基体的潜在候选者。