Novel Translucent and Strong Submicron Alumina Ceramics for Dental Restorations

doi:10.1177/0022034517733742

	Novel Translucent and Strong Submicron Alumina Ceramics for Dental Restorations
	Zhao, M.; Sun, Y.; Zhang, J.; Zhang, Y.
刊名	JOURNAL OF DENTAL RESEARCH
	2018
卷号	97 期号:3 页码:289
关键词	dental ceramics grain size porosity translucency flexural strength fracture toughness
ISSN号	0022-0345
DOI	10.1177/0022034517733742
英文摘要	An ideal ceramic restorative material should possess excellent aesthetic and mechanical properties. We hypothesize that the high translucency and strength of polycrystalline ceramics can be achieved through microstructural tailoring. The aim of this study is to demonstrate the superior optical and mechanical properties of a new class of submicron grain-sized alumina ceramics relative to the current state-of-the-art dental ceramic materials. The translucency, the in-line transmission (T-IT) in particular, of these submicron alumina ceramics has been examined with the Rayleigh-Gans-Debye light-scattering model. The theoretical predictions related very well with the measured T-IT values. The translucency parameter (TP) and contrast ratio (CR) of the newly developed aluminas were measured with a reflectance spectrophotometer on a black-and-white background. For comparison, the T-IT, TP, and CR values for a variety of dental ceramics, mostly measured in-house but also cited from the literature, were included. The flexural strength of the aluminas was determined with the 4-point bending test. Our findings have shown that for polycrystalline alumina ceramics, an average grain size < 1 mu m coupled with a porosity level < 0.7% could yield translucency values (T-IT, TP, CR) similar to those of the commercial high-translucency porcelains. These values are far superior to the high-translucency lithium disilicate glass-ceramic and zirconias, including the most translucent cubic-containing zirconias. The strength of these submicron grain-sized aluminas was significantly higher than that of the cubic-containing zirconia (e.g., Zpex Smile) and lithia-based glass-ceramics (e.g., IPS e.max CAD HT). A coarse-grained alumina could also reach a translucency level comparable to that of dental porcelain. However, the relatively low strength of this material has limited its clinical indications to structurally less demanding applications, such as orthodontic brackets. With a combined high strength and translucency, the newly developed submicron grain-sized alumina may be considered a suitable material for dental restorations.
学科主题	Dentistry, Oral Surgery & Medicine
出版者	SAGE PUBLICATIONS INC
WOS记录号	WOS:000429319800007
资助机构	Funding was provided by the U.S. National Institutes of Health, National Institute of Dental and Craniofacial Research (grants R01DE026772, R01DE026279, R01DE017925). The authors declare no potential conflicts of interest with respect to the authorship and/or publication of this article. ; Funding was provided by the U.S. National Institutes of Health, National Institute of Dental and Craniofacial Research (grants R01DE026772, R01DE026279, R01DE017925). The authors declare no potential conflicts of interest with respect to the authorship and/or publication of this article.
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/25115]
专题	中国科学院上海硅酸盐研究所
作者单位	1.[Zhao, M. 2.Zhang, Y.] NYU, Coll Dent, Dept Biomat & Biomimet, 433 First Ave,Room 810, New York, NY 10010 USA 3.[Sun, Y. 4.Zhang, J.] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent Optofunct Inorgan Mat, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Zhao, M.,Sun, Y.,Zhang, J.,et al. Novel Translucent and Strong Submicron Alumina Ceramics for Dental Restorations[J]. JOURNAL OF DENTAL RESEARCH,2018,97(3):289, 295.
APA	Zhao, M.,Sun, Y.,Zhang, J.,&Zhang, Y..(2018).Novel Translucent and Strong Submicron Alumina Ceramics for Dental Restorations.JOURNAL OF DENTAL RESEARCH,97(3),289.
MLA	Zhao, M.,et al."Novel Translucent and Strong Submicron Alumina Ceramics for Dental Restorations".JOURNAL OF DENTAL RESEARCH 97.3(2018):289.