Synergistic effect of graphene oxide/calcium phosphate nanofiller in a dentin adhesive on its dentin bond integrity and degree of conversion. A scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared, micro-Raman, and bond strength study
Synergistic effect of graphene oxide/calcium phosphate nanofiller in a dentin adhesive on its dentin bond integrity and degree of conversion. A scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared, micro-Raman, and bond strength study
复制标题
DOI：
10.1002/jemt.23764
复制
发表时间：
2021-04-29
影响因子：
2.5
通讯作者：
Abduljabbar, Tariq
中科院分区：
文献类型：
--
作者：
Almutairi, Basil;Kattan, Hiba F.;Abduljabbar, Tariq
目的是配制和分析结合有氧化石墨烯（GO）纳米颗粒和磷酸钙（CaP）复合物的牙本质粘合剂。采用扫描电子显微镜（SEM）-能量色散X射线光谱（EDX）、显微拉曼光谱（micro-Raman spectroscopy）、剪切粘结强度（SBS）和傅里叶变换红外光谱（FTIR）等方法对纳米颗粒复合材料、牙本质粘结韧性、转化度（DC）和粘结剂-牙本质相互作用进行表征。GO纳米颗粒的合成后，使用标准方法用CaP将它们官能化。GO-CaP复合物不添加到实验粘合剂（阴性对照组，GO-CaP-0%）中，并且分别以2.5和5wt%添加以产生GO-CaP-2.5%和GO-CaP 5%组。将牙齿设置为使用三组粘合剂形成粘合样品，用于SBS测试，有和没有热循环。证实了GO-CaP复合物在胶粘剂中的均匀扩散。在SEM显微照片上观察到具有标准渗透的树脂标签。EDX分析证实了在含有粘合剂的复合材料中存在钙、磷和碳离子。SBS试验显示GO-CaP-5%的平均值最高，其次是GO-CaP-2.5%。FTIR光谱证实了磷灰石峰的存在，并且显微拉曼光谱显示了GO纳米颗粒的特征D和G带。GO-CaP复合物可提高牙本质粘接剂的粘接强度。5重量%的添加导致上级于所有其它组的粘结强度。GO-CaP-5%组表现出较低的DC（对照组），GO和CaP复合物在粘合剂中均匀分布，适当的牙本质相互作用和树脂标签形成。
The objective was to formulate and analyze a dentin adhesive incorporated with graphene oxide (GO) nanoparticle and calcium phosphate (CaP) composite. Methods comprising of scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDX), micro-Raman spectroscopy, shear bond strength (SBS), and Fourier transform infrared (FTIR) spectroscopy were used to characterize nanoparticle composite, dentin bond toughness, degree of conversion (DC), and adhesive-dentin interaction. Postsynthesis of GO nanoparticles, they were functionalized with CaP using standard process. The GO-CaP composite was not added to experimental adhesive (negative control group, GO-CaP-0%), and added at 2.5 and 5 wt% to yield GO-CaP-2.5% and GO-CaP 5% groups, respectively. Teeth were set to form bonded samples utilizing adhesives in three groups for SBS testing, with and without thermocycling. The homogenous diffusion of GO-CaP composite was verified in the adhesive. Resin tags having standard penetrations were observed on SEM micrographs. The EDX analysis confirmed the occurrence of calcium, phosphorus, and carbon ions in the composite containing adhesives. The SBS test revealed highest mean values for GO-CaP-5% followed by GO-CaP-2.5%. The FTIR spectra verified the presence of apatite peaks and the micro-Raman spectra showed characteristic D and G bands for GO nanoparticles. GO-CaP composite in dentin adhesive may improve its bond strength. The addition of 5 wt% resulted in a bond strength that was superior to all other groups. GO-CaP-5% group demonstrated lower DC (to control), uniform distribution of GO and CaP composite within adhesive, appropriate dentin interaction, and resin tag formation.