PDF(Pubmed)
Abstract：
Resin cement integrated with zein-incorporated magnesium oxide nanoparticles has previously been found to inhibit oral microbes and decrease bacterial biofilm. However, the bond strength and surface features of this biomaterial have yet to be investigated. The objective of this study was to evaluate the shear bond strength, mode of fracture, and surface roughness of resin cement modified with zein-incorporated magnesium oxide nanoparticles. Characterization of the cement was performed by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. 126 human teeth were divided into 3 groups and cemented to lithium disilicate ceramic using resin cement with zein-incorporated magnesium oxide nanoparticles at concentrations of 0%, 1%, and 2% (n = 42). 21 samples of each group were subjected to the shear bond strength test, while the other 21 underwent thermocycling for 10,000 cycles before the test, after which all samples were evaluated for the mode of fracture. To assess surface roughness, resin cement disks were analyzed by a profilometer before and after undergoing thermocycling for 10,000 cycles. The shear bond strength of the cement with 1% and 2% nanoparticles was significantly higher than the control before thermocycling. The mode of fracture was found to be mainly adhesive with all groups, with the unmodified cement presenting the highest cohesive failure. There was no significant difference in surface roughness between the groups before or after thermocycling. The addition of zein-incorporated magnesium oxide nanoparticles to resin cement improved or maintained the shear bond strength and surface roughness of the resin cement.
摘要：
先前已发现与玉米醇溶蛋白掺入的氧化镁纳米颗粒结合的树脂粘固剂抑制口腔微生物并减少细菌生物膜。然而,这种生物材料的结合强度和表面特征还有待研究。这项研究的目的是评估剪切粘结强度，骨折模式，以及用玉米醇溶蛋白掺入的氧化镁纳米颗粒改性的树脂水泥的表面粗糙度。通过X射线衍射对水泥进行表征，场发射扫描电子显微镜，和傅里叶变换红外光谱。将126颗人类牙齿分为3组，并使用含有玉米醇溶蛋白的氧化镁纳米颗粒的树脂水泥胶结成焦硅酸锂陶瓷，浓度为0％，1%,2%(n=42)。每组21个样品进行剪切粘结强度测试，而其他21人在测试前进行了10000次热循环，之后，对所有样品进行断裂模式评估。要评估表面粗糙度，在经历10,000个循环的热循环之前和之后，通过轮廓仪分析树脂水泥盘。在热循环之前，具有1％和2％纳米颗粒的水泥的剪切粘结强度明显高于对照。发现所有组的断裂模式主要是粘性的，未改性水泥表现出最高的内聚破坏。在热循环之前或之后，两组之间的表面粗糙度没有显着差异。将玉米醇溶蛋白掺入的氧化镁纳米颗粒添加到树脂水泥中改善或保持了树脂水泥的剪切粘结强度和表面粗糙度。
