Composition of clinically aged amalgam restorations.
Composition of clinically aged amalgam restorations.
复制标题
临床老化的汞合金修复体的组成。
DOI：
10.1016/0109-5641(90)90018-a
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Edie,JW
中科院分区：
文献类型：
--
作者：
Boyer,DB;Edie,JW
从5个受试者中获得25个年龄从2到25年不等的汞合金修复体。用电子探针对样品进行了整体元素组成和相组成的分析，并通过背散射电子显微镜点计数法测定了相的体积分数。21个标本是常规的低铜汞合金，其余4个是高铜汞合金。除了含有少量氯化物和其他污染物外，总体元素组成与新制备的汞合金几乎没有变化。相的组成基本上与新汞合金相同，除了内部有相当多的γ粒子合并。临床老年银汞合金的相分布与新生银汞合金有很大的不同。低铜汞合金减少了γ、γ -1和γ -2相的数量，增加了β -1和氯化锡。高铜混合汞合金降低了γ，增加了β -1，增大了反应环（γ -1和α′）。
Twenty-five amalgam restorations ranging in age from two to 25 years were obtained from five subjects. An electron microprobe was used to analyze the specimens for bulk elemental composition and phase composition, and the volume fractions of phases were determined by point-counting on back-scattered electron micrographs. Twenty-one of the specimens were conventional, low-copper amalgams, and the remaining four were high-copper amalgams. The bulk elemental compositions showed little variation from newly prepared amalgams except for the presence of a small amount of chloride and other contaminants. The compositions of the phases were essentially the same as is found in new amalgams, except that there was considerable internal amalgamation of gamma particles. The distribution of phases in the clinically aged amalgams was quite different from that of new amalgams. The low-copper amalgams had decreased amounts of gamma, gamma-1, and gamma-2 phases and increased beta-1 and tin-chloride. The high-copper admixed amalgams had decreased gamma, increased beta-1, and enlarged reaction rings (gamma-1 and eta′).