The strengthening mechanism of a magnesia core ceramic.
The strengthening mechanism of a magnesia core ceramic.
复制标题
氧化镁芯陶瓷的强化机制。
DOI：
10.1016/0109-5641(93)90068-2
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Tien,TY
中科院分区：
文献类型：
--
作者：
O'Brien,WJ;Groh,CL;Boenke,KM;Mora,GP;Tien,TY
一种含有镁砂和镁橄榄石的高膨胀核材料可用于制作金属烤瓷全瓷牙冠。本研究的目的是探讨氧化镁芯材的强化机理。用氧化镁与石英玻璃反应制备了六批氧化镁芯材，保温时间为17~120min。根据ISO牙科陶瓷规范，采用三点加载的方法测量其抗弯强度。用定量X射线衍射法测定了镁橄榄石的含量。镁橄榄石含量与抗折强度之间存在显著的统计学相关性。提出的强化机制是在未反应氧化镁周围的玻璃基质中析出细小的镁橄榄石晶体。反应时间越长，氧化镁溶解越多，镁橄榄石越容易析出。这种方法为牙科陶瓷带来了一种新的强化机制，以前依赖于氧化铝、白榴石或陶瓷晶须的加入。
A high-expansion core material containin magnesia and forsterite may be used to make all-ceramic dental crowns with porcelain-fused-to-metal body porcelains. The purpose of this study was to investigate the strengthening mechanism for the magnesia core material. Six batches of the magnesia core material were made by reacting magnesia with a silica glass with holding times ranging from 17 to 120 min. The flexural strength was measured using three-point loading according to the ISO specification for dental ceramics. The forsterite content was measured using quantitative x-ray diffraction. A statistically significant correlation was found between the forsterite content and flexural strength. The proposed mechanism for strengthening is the precipitation of fine forsterite crystals in the glass matrix surrounding unreacted magnesia. Longer reaction times produced more dissolution of magnesia and subsequent precipitation of forsterite. This method results in a new strengthening mechanism for dental ceramics which have previously relied on the incorporation of alumina, leucite or ceramic whiskers.
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
Dental materials : official publication of the Academy of Dental Materials
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