Research Department/Council of Researches in Education and Sciences, Santos, Brazil.
J Biomed Mater Res A. 2010 Apr;93(1):243-6. doi: 10.1002/jbm.a.32524.
The aim of the present study was to evaluate the Knoop hardness of high viscous glass ionomer cement (GIC) Ketac Molar Easy Mix (3M ESPE, Saint Paul, USA) submitted to different types of compounds for surface protection. Sixty specimens of GIC were made in PVC molds with 7.5 mm diameter and 2.5 mm thickness. Divided in 6 groups: G1, Control (no protection); G2, Cavitine (Copal varnish); G3, Magic bond (Adhesive); G4, Adper Single Bond 2 (Single bottle adhesive); G5, Solid Petroleum Jelly; G6, Nail Varnish. The surface protection was applied after initial setting reaction. The specimens were immersed in deionized water, at 37 degrees C, for 24 h. The surfaces were polished in a rotation machine (Aropol 2V). The hardness test was accomplished in a Digital Microhardness tester HVS-100. In each specimen five indentations were done and repeated after 30 days and 4 months, under the same conditions. The results were submitted to Two-way ANOVA and Tukey Test. The only material that differed from the control group was the nail varnish (p < 0.001), with the other materials showing no significant difference from the control group. It was concluded that the best material for surface protection of GIC was the nail varnish, but because of possible harmful effects, petroleum jelly could be a better option.
本研究的目的是评估高粘度玻璃离子水门汀（GIC）Ketac Molar Easy Mix（3M ESPE，明尼苏达州圣保罗）在经过不同类型的表面保护化合物处理后的努普硬度。将 60 个 GIC 样本放入直径为 7.5 毫米、厚度为 2.5 毫米的 PVC 模具中制成。将样本分为 6 组：G1，对照组（无保护）；G2，Cavitine（紫胶清漆）；G3，Magic bond（黏结剂）；G4，Adper Single Bond 2（单瓶黏结剂）；G5，固体凡士林；G6，指甲油。初始凝固反应后进行表面保护。将样本浸入去离子水中，在 37 摄氏度下放置 24 小时。用旋转机器（Aropol 2V）对样本表面进行抛光。在 Digital Microhardness 测试仪 HVS-100 上进行硬度测试。在每个样本上进行五次压痕测试，并在相同条件下 30 天后和 4 个月后重复测试。结果采用双向方差分析和 Tukey 检验。唯一与对照组有差异的材料是指甲油（p < 0.001），其他材料与对照组无显著差异。结论是指甲油是 GIC 表面保护的最佳材料，但由于可能存在有害影响，凡士林可能是更好的选择。
