Suchatlampong C, Goto S, Ogura H
Department of Prosthodontics, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
Dent Mater J. 1995 Dec;14(2):143-51. doi: 10.4012/dmj.14.143.
The compressive strength of five different amalgams was measured at one hour, six hours, 24 hours, and seven days, and X-ray diffraction analysis was carried out for each amalgam at the same times in order to investigate the early strength characteristics of the amalgams in relation to the formation of different phases. At 24 hours all tested amalgams reached about 90% or more of their seven-day compressive strength, but the increase in the early compressive strength from one hour to 24 hours varied between different amalgams. Two of the five amalgams tested reached about 90% of their seven-day compressive strength at six hours. A significant correlation was found between the ratio of early compressive strength to seven-day compressive strength, and the X-ray diffraction intensity ratio (ratios of one-, six- and 24 hour intensity to seven-day intensity) for the gamma 1 phase, indicating that the increases in early compressive strength are mainly dependent upon the formation of gamma 1.
在1小时、6小时、24小时和7天时测量了五种不同汞合金的抗压强度，并在相同时间对每种汞合金进行了X射线衍射分析，以研究汞合金的早期强度特性与不同相形成之间的关系。在24小时时，所有测试的汞合金均达到其7天抗压强度的约90%或更高，但不同汞合金从1小时到24小时的早期抗压强度增加有所不同。测试的五种汞合金中有两种在6小时时达到其7天抗压强度的约90%。发现早期抗压强度与7天抗压强度的比值与γ1相的X射线衍射强度比（1小时、6小时和24小时强度与7天强度的比值）之间存在显著相关性，表明早期抗压强度的增加主要取决于γ1的形成。
