Department of Restorative Dental Sciences College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Dental Intern, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Scanning. 2022 Aug 10;2022:3477886. doi: 10.1155/2022/3477886. eCollection 2022.
Our study is aimed at preparing an experimental adhesive (EA) and assessing the influence of adding 5-10 wt.% concentrations of zinc oxide (ZnO) nanoparticles on the adhesive's mechanical properties.
Field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy were employed to investigate the morphology and elemental distribution of the filler nanoparticles. To examine the adhesive properties, microtensile bond strength (TBS) testing, an investigation of the rheological properties, degree of conversion (DC), and analysis of the interface between the adhesive and dentin were carried out.
The SEM micrographs of ZnO nanoparticles demonstrated spherical agglomerates. The EDX plotting confirmed the incidence of Zn and oxygen (O) in the ZnO nanoparticles. The highest TBS was observed for nonthermocycled (NTC) 5 wt.% ZnO group (32.11 ± 3.60 MPa), followed by the NTC-10 wt.% ZnO group (30.04 ± 3.24 MPa). Most of the failures observed were adhesive in nature. A gradual reduction in the viscosity was observed at higher angular frequencies, and the addition of 5 and 10 wt.% ZnO to the composition of the EA lowered its viscosity. The 5 wt.% ZnO group demonstrated suitable dentin interaction by showing the formation of resin tags, while for the 10 wt.% ZnO group, compromised resin tag formation was detected. DC was significantly higher in the 0% ZnO (EA) group.
The reinforcement of the EA with 5 and 10 wt.% concentrations of ZnO nanoparticles produced an improvement in the adhesive's TBS. However, a reduced viscosity was observed for both nanoparticle-reinforced adhesives, and a negotiated dentin interaction was seen for 10 wt.% ZnO adhesive group. Further research exploring the influence of more filler concentrations on diverse adhesive properties is recommended.
本研究旨在制备一种实验性胶粘剂（EA），并评估添加 5-10wt.%浓度氧化锌（ZnO）纳米粒子对胶粘剂机械性能的影响。
采用场发射扫描电子显微镜（FESEM）和能量色散 X 射线（EDX）光谱法研究了填料纳米粒子的形态和元素分布。通过微拉伸粘结强度（TBS）测试、流变性能研究、转化率（DC）分析以及粘结剂与牙本质界面分析来评估粘结性能。
ZnO 纳米粒子的 SEM 显微照片显示出球形团聚体。EDX 绘图证实了 ZnO 纳米粒子中 Zn 和 O 的存在。非热循环（NTC）5wt.% ZnO 组的 TBS 最高（32.11±3.60MPa），其次是 NTC-10wt.% ZnO 组（30.04±3.24MPa）。观察到的大多数失效类型为粘结性失效。在较高角频率下，观察到粘度逐渐降低，而在 EA 中添加 5wt.%和 10wt.% ZnO 降低了其粘度。5wt.% ZnO 组通过形成树脂突表现出与牙本质的适当相互作用，而 10wt.% ZnO 组则检测到树脂突形成受损。0% ZnO（EA）组的 DC 明显更高。
用 5wt.%和 10wt.%浓度的 ZnO 纳米粒子增强 EA 可提高粘结剂的 TBS。然而，两种纳米粒子增强的胶粘剂的粘度都有所降低，而 10wt.% ZnO 胶粘剂组的牙本质相互作用受到影响。建议进一步研究更多填料浓度对不同粘结性能的影响。
