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学科主题: 口腔医学
题名:
Bi-colored zirconia as dental restoration ceramics
作者: Zhao, Jing1,2; Shen, Zhijian2,3; Si, Wenjie3; Wang, Xinzhi1
关键词: Pressing ; Color ; ZrO2 ; Biomedical application
刊名: CERAMICS INTERNATIONAL
发表日期: 2013-12-01
DOI: 10.1016/j.ceramint.2013.05.036
卷: 39, 期:8, 页:9277-9283
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Materials Science, Ceramics
研究领域[WOS]: Materials Science
关键词[WOS]: YTTRIA-STABILIZED ZIRCONIA ; BOND STRENGTH ; VENEERING CERAMICS ; FLEXURAL STRENGTH ; CROWNS ; CORE ; PROSTHESES
英文摘要:

Machinable zirconia blocks with gradient colors are fundamental for fabrication of full-contour esthetic dental restorations. The aim of this study was to process and evaluate bi-colored zirconia ceramics as a pilot dental material by using well-established techniques. Two commercially available partially stabilized zirconia granules, one undoped and one doped with 0.202 wt% Fe2O3, resulted in white and yellow colors after sintering, respectively. Bi-colored zirconia was fabricated by two-step dry pressing of both zirconia granules one above the other to form green bodies, followed by cold isostatic pressing (CIP) and, a two-step pressureless sintering finally at 1450 degrees C. The dilatometer results showed that the Fe2O3 doped zirconia sintered slightly rapid, but the difference of shrinkage between two powders was <1%. Sintered bars achieved full density, 6.018 g/cm(3) (similar to 99%TD), without cracks in the similar to 1 mm color gradient zone. The microstructures were characterized by scanning electron microscopy (SEM) and careful observation of both surface and interior provided no obvious structural difference of either grains or pores among the three distinct regions, comprising white, yellow and color gradient zone. Vickers hardness of hi-colored zirconia was similar to 13.1 GPa, with no obvious difference in the three regions. The four-point bending strength of the hi-colored zirconia bars was 745.5 +/- 159.6 MPa, which appeared noticeably lower than that of the single-colored references being above 1000 MPa. Fractographic analysis revealed that in most of the cases (60%) the fracture was initiated at the color gradient zone, where large voids with high coordination numbers, agglomerates with critical size and concentration of irregular grains with porous surfaces were observed. Above all, bi-colored zirconia ceramics prepared by the improved technique could meet the basic requirements of dental materials. The ways of minimizing the defects within hi-colored blocks should be developed for the production of esthetic zirconia ceramics of high strength and reliability. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

语种: 英语
项目资助者: China Scholarship Council (CSC) ; Swedish Innovation System (Vinnova) ; Swedish Research Council (VR) through Berzelii Center EXSELENT
WOS记录号: WOS:000325835100096
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/61922
Appears in Collections:北京大学口腔医学院_口腔修复科_期刊论文

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作者单位: 1.Peking Univ, Sch & Hosp Stomatol, Dept Prosthodont, Beijing 100081, Peoples R China
2.Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden
3.Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

Recommended Citation:
Zhao, Jing,Shen, Zhijian,Si, Wenjie,et al. Bi-colored zirconia as dental restoration ceramics[J]. CERAMICS INTERNATIONAL,2013,39(8):9277-9283.
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