Di Lenarda R, Cadenaro M, Gregorig G, De Stefano Dorigo E
Institute of Odontology, University of Trieste, Italy.
J Adhes Dent. 2000 Autumn;2(3):223-8.
This study evaluated the marginal microleakage in bonded amalgam restorations in teeth extracted a month after restoration placement.
Nine teeth in a patient scheduled for complete extraction were selected. In each tooth, a buccal prepared cavity was treated with Scotchbond Plus and filled with high copper amalgam. In four teeth, a lingual unlined restoration was also prepared as control. A month later, all the teeth were extracted; seven teeth were immersed for 48 hours in a 0.05% basic fucsine dye solution and then sectioned. Sections were observed with a stereomicroscope at 10X. Results were statistically evaluated using a nonparametric Mann-Whitney test for independent data. The remaining two teeth were sectioned and observed using a scanning electron microscope (SEM).
Stereomicroscopic analysis revealed that 80% of bonded specimens did not exhibit dye infiltration at the enamel margin; the same percentage of bonded specimens showed partial infiltration at the cervical margin. In the unlined control specimens, there was a complete dye infiltration at both margins. SEM analysis revealed a good adaptation between resin and tooth and between resin and amalgam.
Bonded amalgam restorations are effective in reducing marginal microleakage, particularly at the enamel margin.
本研究评估了修复体放置一个月后拔除的牙齿中粘结银汞合金修复体的边缘微渗漏情况。
选择一名计划进行全口拔牙患者的九颗牙齿。在每颗牙齿上，对颊侧预备的窝洞用Scotchbond Plus处理并用高铜银汞合金充填。在四颗牙齿上，还制备了舌侧无衬层修复体作为对照。一个月后，拔除所有牙齿；七颗牙齿浸泡在0.05%碱性品红染料溶液中48小时，然后进行切片。切片在体视显微镜下以10倍放大观察。结果使用非参数曼-惠特尼独立数据检验进行统计学评估。其余两颗牙齿进行切片并用扫描电子显微镜（SEM）观察。
体视显微镜分析显示，80%的粘结标本在釉质边缘未出现染料渗入；相同比例的粘结标本在颈部边缘出现部分渗入。在无衬层对照标本中，两个边缘均出现完全染料渗入。扫描电子显微镜分析显示树脂与牙齿之间以及树脂与银汞合金之间有良好的适应性。
粘结银汞合金修复体在减少边缘微渗漏方面有效，尤其是在釉质边缘。
