Jiangsu Key Laboratory of Oral Diseases, Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
Jiangsu Key Laboratory of Oral Diseases, Department of Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
J Dent. 2020 Mar;94:103306. doi: 10.1016/j.jdent.2020.103306. Epub 2020 Feb 26.
This study investigated the effects of the surface conditioning of nano-zirconia fillers with 10-methacryloyloxydecyl dihydrogen phosphate (MDP) and dipentaerythritol penta-acrylate phosphate (PENTA) on the degree of conversion and mechanical properties of Bis-GMA- and UDMA-based resin composites containing the fillers.
MDP or PENTA conditioned nano-zirconia fillers were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The conditioned nano-zirconia fillers were then used to prepare Bis-GMA- and UDMA-based resin composites. The bending strength and elastic modulus of the prepared composites were evaluated, and Weibull analysis was adopted to evaluate the reliability of the bending tests. Degree of conversion (DC) was measured by FTIR.
FTIR and XPS analysis confirmed formation of ZrOP bonds in the MDP-conditioned and PENTA-conditioned zirconia fillers. MDP-conditioning and PENTA-conditioning increased bending strength of Bis-GMA-based composites (100.70 ± 7.15 MPa, 98.65 ± 4.76 Mpa) and UDMA-based composites (99.02 ± 4.45 MPa, 99.92 ± 5.78 MPa) compared to the groups with untreated nano-zirconia fillers (Bis-GMA-based, 84.98 ± 5.13 MPa; UDMA-based, 88.24 ± 4.61 MPa). The same trend was observed for the Weibull modulus (m) and elastic modulus. The MDP/PENTA conditioning did not affect the DC of the composites.
MDP or PENTA conditioning of nano-zirconia fillers improved the mechanical properties of the composite compared to the composites containing untreated nano-zirconia fillers; however, it did not affect DC.
Mixing MDP- or PENTA-conditioned nano-zirconia fillers directly with gamma-MPS-conditioned silica to the resin composite has the potential to improve the composite's mechanical properties.
本研究旨在探讨用 10-甲氧基癸基二氢磷酸酯（MDP）和五羟乙基季戊四醇磷酸酯（PENTA）对纳米氧化锆填料表面进行处理，对双酚 A 双甲基丙烯酸酯（Bis-GMA）和二甲基丙烯酸己二醇酯（UDMA）基树脂复合材料的转化率和力学性能的影响。
用傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）对 MDP 或 PENTA 处理后的纳米氧化锆填料进行表征。然后用处理后的纳米氧化锆填料制备 Bis-GMA 和 UDMA 基树脂复合材料。评估制备复合材料的弯曲强度和弹性模量，并采用威布尔分析评估弯曲试验的可靠性。用 FTIR 测量转化率（DC）。
FTIR 和 XPS 分析证实 MDP 处理和 PENTA 处理的氧化锆填料中形成了 ZrOP 键。与未处理纳米氧化锆填料组（Bis-GMA 基，84.98 ± 5.13 MPa；UDMA 基，88.24 ± 4.61 MPa）相比，MDP 处理和 PENTA 处理提高了 Bis-GMA 基复合材料（100.70 ± 7.15 MPa，98.65 ± 4.76 MPa）和 UDMA 基复合材料（99.02 ± 4.45 MPa，99.92 ± 5.78 MPa）的弯曲强度。威布尔模数（m）和弹性模量也呈现出相同的趋势。MDP/PENTA 处理对复合材料的 DC 没有影响。
与含有未处理纳米氧化锆填料的复合材料相比，用 MDP 或 PENTA 处理纳米氧化锆填料可提高复合材料的力学性能；但对 DC 没有影响。
将 MDP 或 PENTA 处理的纳米氧化锆填料与γ-甲基丙烯酰氧基丙基三甲氧基硅烷处理的二氧化硅直接混合到树脂复合材料中，有可能提高复合材料的力学性能。
