Objective

Zirconia and alumina nanoparticles were coated with a silica-rich layer (ALSI and ZRSI) and used to prepare experimental nanohybrid resin composites, which were characterized and compared to a control commercial resin composite (Filtek Z350 XT).

Methods

Silica nanoparticles with sizes compatible to ALSI (Aerosil 150) and ZRSI (Aerosil OX 50) were tested as references. The volume of nanoparticles was equivalent across the composites, which also had consistent content of glass microparticles. CC conversion, viscosity, depth of cure, surface topography, hardness, opacity, radio-opacity, and edge chipping resistance (ReA) were tested after 24 h. Flexural strength (σ_f) and fracture toughness (K_IC) were also tested after 15 K thermal cycles. Data were analyzed using one-way or two-way ANOVA and Tukey’s test (α = 0.05).

Results

ALSI and ZRSI yielded resin composites with lower viscosity and more irregular nanoagglomerates compared to nanosilica-based composites. CC conversion and depth of cure were lower for ZRSI composite, which had higher opacity, radio-opacity, and hardness. ReA was higher for ALSI composite. Composites with ALSI and ZRSI showed stable σ_f after aging, whereas the control and Aerosil 150 resin composites showed significant degradation. The commercial and nanosilica-based composites showed up to 42% reduction in K_IC after aging, whereas resin composites with ZRSI and ALSI showed a more stable K_IC.

Significance

ALSI and ZRSI generated nanohybrid resin composites with improved and/or more stable physical properties compared with nanosilica-based and commercial composites. This study suggests that changing the composition of nanofillers is a simple method to enhance the performance of nanohybrid composites.

中文翻译：

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用于改进纳米混合树脂复合材料的非硅酸盐纳米粒子。

客观的

氧化锆和氧化铝纳米颗粒涂有富含二氧化硅的层（ALSI 和 ZRSI），并用于制备实验性纳米混合树脂复合材料，对其进行表征并与对照商业树脂复合材料（Filtek Z350 XT）进行比较。

方法

测试尺寸与 ALSI (Aerosil 150) 和 ZRSI (Aerosil OX 50) 兼容的二氧化硅纳米粒子作为参考。整个复合材料中纳米颗粒的体积相等，同时也具有一致的玻璃微粒含量。24 小时后测试C C 转化率、粘度、固化深度、表面形貌、硬度、不透明性、射线不透明性和抗边缘崩裂性 (ReA)。在 15 K 热循环后还测试了弯曲强度 (σ _f ) 和断裂韧性 (K _IC )。使用单向或双向方差分析和 Tukey 检验 ( α = 0.05) 分析数据。

结果

与基于纳米二氧化硅的复合材料相比，ALSI 和 ZRSI 产生的树脂复合材料具有更低的粘度和更不规则的纳米团聚体。ZRSI 复合材料的C C 转化率和固化深度较低，其具有较高的不透明度、射线不透明度和硬度。ALSI 复合材料的 ReA 更高。具有 ALSI 和 ZRSI 的复合材料在老化后表现出稳定的 σ _f，而对照和 Aerosil 150 树脂复合材料显示出显着的降解。商业和纳米二氧化硅基复合材料在老化后的K _IC降低了 42% ，而具有 ZRSI 和 ALSI 的树脂复合材料显示出更稳定的 K _IC。

意义

与基于纳米二氧化硅和商业复合材料相比，ALSI 和 ZRSI 生成的纳米混合树脂复合材料具有改进和/或更稳定的物理性能。这项研究表明，改变纳米填料的组成是一种提高纳米杂化复合材料性能的简单方法。