Naguib Ghada, Mously Hisham, Mazhar Jumana, Alkanfari Ibrahim, Binmahfooz Abdulelah, Zahran Mohammed, Hamed Mohamed T
Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
Department of Oral Biology, Cairo University School of Dentistry, Cairo, Egypt.
Discov Nano. 2024 Aug 6;19(1):123. doi: 10.1186/s11671-024-04074-w.
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.
先前已发现，与含玉米醇溶蛋白的氧化镁纳米颗粒结合的树脂水门汀可抑制口腔微生物并减少细菌生物膜。然而，这种生物材料的粘结强度和表面特征尚未得到研究。本研究的目的是评估用含玉米醇溶蛋白的氧化镁纳米颗粒改性的树脂水门汀的剪切粘结强度、断裂模式和表面粗糙度。通过X射线衍射、场发射扫描电子显微镜和傅里叶变换红外光谱对水门汀进行表征。将126颗人牙分为3组，使用浓度为0%、1%和2%（n = 42）的含玉米醇溶蛋白的氧化镁纳米颗粒的树脂水门汀粘结到二硅酸锂陶瓷上。每组21个样本进行剪切粘结强度测试，另外21个在测试前进行10000次热循环，之后对所有样本评估断裂模式。为评估表面粗糙度，对树脂水门汀圆盘在进行10000次热循环前后用轮廓仪进行分析。热循环前，含1%和2%纳米颗粒的水门汀的剪切粘结强度显著高于对照组。发现所有组的断裂模式主要为粘结型，未改性的水门汀呈现出最高的内聚破坏。热循环前后各组之间的表面粗糙度没有显著差异。向树脂水门汀中添加含玉米醇溶蛋白的氧化镁纳米颗粒可改善或保持树脂水门汀的剪切粘结强度和表面粗糙度。
