Preparation and Performance of Superhydrophobic Gel Nano-coating on Enamel Surface

doi:10.13701/j.cnki.kqyxyj.2020.06.019

Abstract

Abstract: Objective: To investigate the preparation and performance of superhydrophobic gel nano-coating on enamel surface. Methods: A sol-gel method was used to prepare a trimethylsilyl-modified dopamine-silicone gel (DSTM) superhydrophobic coating. Several 4 mm × 4 mm × 2 mm enamel blocks of bovine tooth were randomly divided into two groups: the experimental group and the control group, which were treated separately by DSTM and deionized water. The effect of coating superhydrophobicity was evaluated by the contact angle. Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) were used to assess the microstructure of the coating surface and analyze the composition of the tooth surface coating. The cell toxicity and biological safety were tested by CCK-8 colorimetry. In order to evaluate the stability of the hydrophobic coating in the oral environment, the coated enamel mass was immersed in artificial saliva at 37 ℃ for 2 h, 4 h, 6 h, 10 h, and 12 h and then observed the contact angle and surface microstructure changes. Results: The contact angle of dental tablets was (60.20±4.56)°, while that of the experimental group was (153.88±2.81)° (P<0.05). Under the SEM observation, the coating surface was composed of interconnected micrometers and nanopores that form a three-dimensional nano-network structure. The XPS and FT-IR showed that the DSTM coating on the tooth surface was successfully prepared. Among the detection values at 24 h, 48 h, and 72 h, the OD values of all groups were comparable to the blank group values. The results of the coating stability experiment showed that the sample still had superhydrophobic properties with a contact angle value of (149.40±2.43)° after being soaked in artificial saliva for 12 h. However, there was no significant changes in the micro-morphology of the micropores and micro-nano structures from the SEM of the saliva-treated coating. Conclusion: In this experiment, a DSTM gel coating was successfully prepared by the sol-gel method. The coating with good biological safety and hydrophobicity has certain stability in a 37 ℃ artificial saliva environment, which provided a basis for the new anti-caries materials.

Key words: super-hydrophobic coating, enamel surface, dopamine, sol-gel

JIN Xiaoting, SHI Shi, CHEN Huanhuan, XUE Dong, MA Jianfeng. Preparation and Performance of Superhydrophobic Gel Nano-coating on Enamel Surface[J]. Journal of Oral Science Research, 2020, 36(6): 585-590.

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