Preparation of Zinc Oxide Mesocrystal Filler and Its Properties as Dental Composite Resin

doi:10.15541/jim20180598

Abstract

Abstract:

The inorganic filler is the main component of the dental restoration composite resin, which is very important for the properties and functions of composite resin. In this paper, zinc oxide (ZnO) mesocrystal microspheres were prepared from Zn(NO₃)?6H₂O solution in presence of triethanolamine as the soft template by hydrothermal method, these microspheres were self-assembled by 37.5 nm ZnO crystallite and with good order. ZnO mesocrystal microspheres were modified with γ-methacryloxypropyl trimethoxysilane (γ-MPS) and subsequently mixed with modified SiO₂ microspheres as fillers, and then added to the Bis-GMA/TEGDMA system to prepare the composite resin. Through morphology observation and performance test, it is found the filler is uniformly dispersed in composite resin. The one filled with 20wt% ZnO mesocrystals has excellent mechanical properties and wear resistance, among which the flexural strength and modulus reach 133 MPa and 9.8 GPa, respectively with the volume loss at 1.02 mm ³ after 3000 times of wearing, which was 88.7% and 90.8% lower than that of the composite resin filled with commercial ZnO microspheres and bare SiO₂, respectively. Moreover, the antibacterial rate of zinc oxide composite resin against streptococcus mutans in the oral cavity reached 99.9%.

Key words: dental composite resin, ZnO mesocrystal, mechanical property, wear resistance, antibacterial property

CLC Number:

TQ174

LIU Yu-Ling, WANG Rui-Li, LI Nan, LIU Mei, ZHANG Qing-Hong. Preparation of Zinc Oxide Mesocrystal Filler and Its Properties as Dental Composite Resin[J]. Journal of Inorganic Materials, 2019, 34(10): 1077-1084.

Figures/Tables 8

Fig. 1 SEM images of inorganic fillers: ZnO mesocrystal at low magnification (a) and high magnification (b), commercial ZnO microsphere (c), and SiO2 microsphere (d)

Fig. 2 XRD spectrum of ZnO microspheres (a); N2 isothermal adsorption and desorption curve of ZnO microspheres with insert showing its pore size distribution (b); TEM (c) and HRTEM (d) images of ZnO microspheres and selected area electron diffraction patterns of ZnO microspheres (e)

Fig. 3 FT-IR spectra of ZnO before and after modification (a) and FT-IR spectra of SiO2 before and after modification (b)

Fig. 4 Flexural strength (a), flexural modulus (b) and compression strength (c) of S composite resin, SZS and SZM composite resin

Fig. 5 SEM images of composite resin fracture surfaces: S resin fracture surface (a); SZS20 resin fracture surface (b); SZM20 resin fracture surfaces (c-d)

Fig. 6 Wear resistance test of dental composite resin

Fig. 7 SEM images of wear samples of S, SZS20 and SZM20 composite resin under different wear time

Fig. 8 Digital photos of antibacterial effect of S resin (a) SZS20 (b) and SZM20 (c) composite resins

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