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    Effect of APTES- or MPTS-Conditioned Nanozirconia Fillers on Mechanical Properties of Bis-GMA-Based Resin Composites

    Year: 2020

    Journal: ACS Omega, Volume 5, DEC 22, page 32540–32550

    Authors: Yang, Jiaxue; Liao, Mengyuan; Hong, Gaoying; Dai, Shiqi; Shen, Jiadi; Xie, Haifeng; Chen, Chen

    Organizations: Natural Science Foundation of Jiangsu Province of ChinaNatural Science Foundation of Jiangsu Province [BK20191348]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [81970927]; Qing Lan ProjectJiangsu Polytech Institute; Priority Academic Program Development of Jiangsu Higher Education Institutions [2018-87]

    To investigate the effects of 3-aminopropyltriethoxysilane (APTES)- or (3-mercaptopropyl)trimethoxysilane (MPTS)-conditioned nanozirconia fillers on the mechanical properties of Bis-GMA-based resin composites. The conditioned fillers were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and thermodynamic calculations. They were then used to prepare Bis-GMA-based resin composites, whose flexural strength and elastic modulus were evaluated. The Cell Counting Kit-8 (CCK-8) assessed the composites' cytotoxicity. The FTIR spectra of the conditioned fillers showed new absorption bands at 1569 and 1100 cm(-1), indicating successful grafting of APTES or MPTS onto nanozirconia. XPS confirmed the Zr-O-Si bonds in the APTES- or MPTS-conditioned fillers at contents of 2.02 and 6.98%, respectively. Thermodynamic calculations reaffirmed the chemical binding between the two silanes and nanozirconia Composites containing the conditioned nanozirconia fillers had significantly greater flexural strengths (APTES, 121.02 +/- 8.31 MPa; MPTS, 132.80 +/- 15.80 MPa; control, 94.84 +/- 9.28 MPa) and elastic moduli (8.76 +/- 0.52, 9.24 +/- 0.60, and 7.44 +/- 0.83 GPa, respectively) than a control with untreated fillers. The cytotoxicity assay identified no significant cytotoxicity by composites containing the conditioned fillers. Silanes were previously considered to be unable to chemically condition zirconia to bond with resin. Inclusion of APTES- or MPTS-conditioned nanozirconia fillers can improve the mechanical properties of Bis-GMA-based resin composites without obvious cytotoxicity in this study.
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