Grossman E S, Witcomb M J, Matejka J M
University of Witwatersrand, Johannesburg, South Africa.
J Prosthet Dent. 1995 Mar;73(3):290-8. doi: 10.1016/s0022-3913(05)80208-2.
Eighty extracted, noncarious premolars were restored with one of 20 different combinations of restorative materials: a high- or low-copper amalgam, unlined or lined with one of five bases, and varnished or unvarnished. The teeth were aged in 1% NaCl and after 3 months and 1 year the seal material deposited on the cut tooth cavity surface and the surface of the amalgam restoration was analyzed by use of energy dispersive x-ray analysis. Atomic weight percentages of marginal seal elements were statistically examined with ANOVA and Tukey's test with significance set at p < 0.05. The results indicated that only one type of seal was formed centered around tin. More marginal seal material was present in the 1-year specimens. Restoration materials used affected the deposition rate of marginal seal material. Low-copper amalgam-restored teeth formed more seal material with significantly greater amounts of chlorine and tin. Less marginal seal material was found in varnished cavities. A calcium hydroxide base produced a thick marginal seal with a significantly different composition of elements compared with the unlined and zinc-based specimens. Tin in Poly-F Plus polycarboxylate cement did not significantly increase the tin content of the marginal seal. Base materials can play a role in determining crevice pH. The findings have bearing on improved longevity of amalgam restorations.
高铜或低铜汞合金，内衬或不内衬五种基底材料之一，以及涂漆或未涂漆。牙齿在1%氯化钠溶液中老化，3个月和1年后，通过能量色散X射线分析对沉积在切割的牙腔表面和汞合金修复体表面的密封材料进行分析。边缘密封元素的原子重量百分比通过方差分析和Tukey检验进行统计学检验，显著性设定为p < 0.05。结果表明，仅形成了一种以锡为中心的密封类型。1年的样本中存在更多的边缘密封材料。所使用的修复材料影响边缘密封材料的沉积速率。低铜汞合金修复的牙齿形成了更多的密封材料，其中氯和锡的含量显著更高。涂漆的牙腔中发现的边缘密封材料较少。氢氧化钙基底产生了厚的边缘密封，其元素组成与未内衬和锌基样本相比有显著差异。聚F Plus聚羧酸锌粘固粉中的锡并未显著增加边缘密封的锡含量。基底材料在确定缝隙pH值方面可以发挥作用。这些发现与改善汞合金修复体的使用寿命有关。
