Synthesis and characterization of multilayer graphene oxide on yttria-zirconia ceramics for dental implant
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Synthesis and characterization of multilayer graphene oxide on yttria-zirconia ceramics for dental implant Cheng Zhang1, Zhaoliang Jiang1,a), Li Zhao1, Wenping Liu1, Pengchao Si2, Jing Lan3,4 1
Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering, Shandong University, Jinan 250061, P.R. China 2 SDU & Rice Joint Center for Carbon Nanomaterials, Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, P. R. China 3 Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan 250012, P.R. China 4 Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering, Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan 250012, P.R. China a)Address all correspondence to this author. e-mail: [email protected] Received: 24 February 2020; accepted: 17 July 2020
In order to expand the family and improve the bioactivity of oral implant ceramics, the phase structures, mechanical and wetting properties of the hot-pressed yttria-zirconia/multilayer graphene oxide composite (3YZrO2/GO) ceramics were investigated. GO was uniformly distributed in 3Y-ZrO2 powders, forming the C–O–Zr bond during the sintering process. In comparison to raw 3Y-ZrO2 ceramics, the flexural strength and fracture toughness improved up to 200% (1489.96 ± 35.71 MPa) in ZG3 (with 0.15 wt% GO) and 40.9% (8.95 ± 0.59 MPa m1/2) in ZG2 (with 0.1 wt% GO), respectively, while the relative density and Vickers hardness increased slightly. The toughening mechanisms included crack deflection, crack bridging, and GO put-out. Meanwhile, the composite ceramics were transformed into a more hydrophilic direction and indicated a good wetting property. In consideration of mechanical and wetting properties, the ZG3 would be a favorable alternative to the yttriazirconia ceramic (Y-TZP) in dental implant applications. The results are expected to serve as a technical guidance for the fabrication and evaluation of dental implants.
Introduction In recent years, zirconia ceramic has attracted considerable attention from the scientific and medical communities. It is a potential material for dental restoration and the hip replacement because of its desirable properties, e.g., high hardness and strength, excellent wear resistance, and biocompatibility [1, 2]. Meanwhile, zirconia ceramic could be a replacement of titanium alloy which has been proved corrosive and sensitive to teeth [3]. Generally, zirconia-based ceramics applied in the dental restoration include 3Y-TZP ceramics [4, 5], glass–moisture ceramics [6, 7], and Mg-PSZ ceramics [8, 9]. The phase transformation of ZrO2-based ceramics could shorten their service life in the dental field, especially under the complex biochemical conditions. The brittleness is still an obstacle for ZrO2-based ceramics, and more effort is needed to improve th
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