Briseño Marroquin B, Kremers L, Willershausen-Zönchen B, Mücke A
Department of Conservative Dentistry, Johannes Gutenberg University, Mainz, Germany.
Oper Dent. 1995 Sep-Oct;20(5):197-203.
Inadequate adaptation of a filling material to a gold crown can promote the passage of bacteria; thus, recontamination of sound dentin and/or the pulp canal space is feasible. The aim of this study was to determine the marginal microleakage between two different amalgams (Tytin and Valiant PHD-XT), three different composites (Tetric, Charisma, and Polofil Molar), and one glass-ionomer cement (Ketac Silver) and gold cast crowns using a helium gas microleakage method. In order to standardize the research parameters, gold washers with standardized dimensions were used as study models together with a helium leakage testing device. Standardized cavities were filled according to the manufacturers' recommendations with the different materials. The amount of helium passing the marginal interface between the fillings and cavities was measured with a mass spectrometer 48 hours after the fillings were placed and 100, 1000, and 2000 thermocycles (5 degrees C-55 degrees C). The results showed that amalgam allowed the least microleakage. Ketac Silver showed the greatest microleakage. Statistically significant differences were found between the composites and both amalgams and Ketac Silver between the 48-hour and 100-thermocycling groups. Yet, Ketac Silver showed a significant ascending tendency when compared to the composites and amalgams after 100, 1000, and 2000 thermocycles.
填充材料与金冠之间适配不佳会促使细菌侵入；因此，健康牙本质和/或牙髓腔再次被污染是有可能的。本研究的目的是使用氦气微渗漏法测定两种不同汞合金（Tytin和Valiant PHD - XT）、三种不同复合材料（Tetric、Charisma和Polofil Molar）以及一种玻璃离子水门汀（Ketac Silver）与铸造金冠之间的边缘微渗漏情况。为使研究参数标准化，使用具有标准尺寸的金垫圈作为研究模型，并配备氦气泄漏检测装置。按照制造商的建议，用不同材料填充标准化洞型。在充填后48小时以及100、1000和2000次热循环（5摄氏度 - 55摄氏度）后，用质谱仪测量通过填充物与洞型边缘界面的氦气量。结果显示，汞合金的微渗漏最少。Ketac Silver的微渗漏最大。在48小时组和100次热循环组之间，复合材料与汞合金及Ketac Silver之间存在统计学上的显著差异。然而，与复合材料和汞合金相比，在100、1000和2000次热循环后，Ketac Silver显示出显著的上升趋势。
