老化方法对环氧化物/丙烯酸酯、有机硅氧烷和 Bis-GMA 基树脂复合材料的断裂韧性和物理稳定性的影响。
The effect of aging methods on the fracture toughness and physical stability of an oxirane/acrylate, ormocer, and Bis-GMA-based resin composites.
机构信息
Department of Operative Dentistry, The Univeristy of Iowa, College of Dentistry & Dental Clinics, 801 Newton Rd, Iowa City, IA, 52242, USA.
Department of Restorative Dental Science, King Saud University College of Dentistry, Riyadh, 11545, Saudi Arabia.
出版信息
Clin Oral Investig. 2020 Jan;24(1):369-375. doi: 10.1007/s00784-019-02912-1. Epub 2019 May 18.
PURPOSE
To determine the effect of aging methods on the fracture toughness of a conventional Bis-GMA-based resin composite (Filtek Supreme), an ormocer-based resin composite (Admira), and an experimental hydrophobic oxirane/acrylate interpenetrating network resin system (OASys)-based composite.
METHODS
A 25 × 5 × 2.8-mm stainless-steel mold with 2.5 mm single-edge center notch, following ASTM standards [E399-90], was used to fabricate 135 specimens (n = 15) of the composite materials and randomly distributed into groups. For the baseline group, specimens were fabricated and then tested after 24-h storage in water. For the biofilm challenge, specimens were randomly placed in a six-well tissue culture plate and kept at 37 °C with bacterial growth media (Brain Heart Infusion (BHI); Streptococcus mutans) changed daily for 15 days. For the water storage challenge, specimens were kept in 5 ml of deionized distilled autoclaved water for 30 days at 37 °C. μCT evaluation by scanning the specimens was performed before and after the proposed challenge. Fracture toughness (K) testing was carried out following the challenges.
RESULTS
μCT surface area and volume analyses showed no significant changes regardless of the materials tested or the challenge. Filtek and Admira fracture toughness was significantly lower after the biofilm and water storage challenges. OASys mean fracture toughness values after water aging were significantly higher than that of baseline. Toughness values for OASys composites after biofilm aging were not statistically different when compared to either water or baseline values.
CONCLUSION
The fracture toughness of Bis-GMA and ormocer-based dental resin composites significantly decreased under water and bacterial biofilm assault. However, such degradation in fracture toughness was not visible in OASys-based composites.
CLINICAL SIGNIFICANCE
Current commercial dental composites are affected by the oral environment, which might contribute to the long-term performance of these materials.
目的
确定老化方法对传统 Bis-GMA 基树脂复合材料（Filtek Supreme）、基于有机硅的树脂复合材料（Admira）和实验性疏水性环氧化物/丙烯酸酯互穿网络树脂系统（OASys）基复合材料的断裂韧性的影响。
方法
按照 ASTM 标准[E399-90]，使用 25×5×2.8-mm 的不锈钢模具，模具带有 2.5mm 单边中心缺口，制备了 135 个复合材料试件（n=15），并随机分布到各个组中。对于基线组，试件在 24 小时水储存后进行制备和测试。对于生物膜挑战，将试件随机放置在六孔组织培养板中，在 37°C 下用细菌生长培养基（脑心浸液（BHI）；变形链球菌）保持，每天更换一次，持续 15 天。对于水储存挑战，将试件保存在 37°C 下的 5ml 去离子蒸馏无菌水中 30 天。在提出的挑战之前和之后，通过对试件进行 μCT 评估来进行扫描。进行断裂韧性（K）测试。
结果
μCT 表面面积和体积分析显示，无论测试材料如何，无论挑战如何，均无明显变化。Filtek 和 Admira 的断裂韧性在生物膜和水储存挑战后显著降低。OASys 在水老化后的平均断裂韧性值明显高于基线值。与水或基线值相比，OASys 复合材料在生物膜老化后的韧性值没有统计学差异。
结论
Bis-GMA 和基于有机硅的牙科树脂复合材料的断裂韧性在水和细菌生物膜攻击下显著降低。然而，OASys 基复合材料的断裂韧性没有明显降解。
临床意义
目前的商业牙科复合材料受到口腔环境的影响，这可能会影响这些材料的长期性能。
Zotero 插件