Levartovsky S, Goldstein G R, Georgescu M
Kriser Dental Center, New York University, New York, USA.
J Prosthet Dent. 1996 Feb;75(2):154-8. doi: 10.1016/s0022-3913(96)90092-x.
This study compared the shear bond strengths of three core materials: a light activated glass-ionomer cement (VariGlass VLC), a fluoride-release dual cure composite resin (Fluoro Core), and a conventional silver-reinforced glass-ionomer cement (Miracle Mix) when cured to dentin. Fifty-four noncarious molar teeth were extracted, cleaned, mounted in acrylic resin, and sectioned horizontally to expose the dentin surface. Each material was mixed according to manufacturer's instructions, applied in a premade mold to the exposed dentin, and then cured. The specimens were randomized into three group (six teeth from each material) and stored (37 degrees C, 100% humidity) for 15 minutes, 24 hours, and 24 hours and were then thermocycled (5 degrees to 55 degrees C) for 125 cycles. The specimens were tested for shear bond strength with the Instron universal testing machine. The differences among time groups were not statistically significant except for Miracle Mix and VariGlass VLC cements, which showed a greater improvement with thermocycling. This study indicated that the FluoroCore resin exhibited the greatest shear bond strength of the core materials and that VariGlass VLC cement had greater bond strength than Miracle Mix cement except after thermocycling, when VariGlass VLC cement and FluoroCore resin were not significantly different.
一种光固化玻璃离子水门汀（VariGlass VLC）、一种含氟释放的双固化复合树脂（Fluoro Core）和一种传统的银增强玻璃离子水门汀（Miracle Mix）。提取54颗无龋磨牙，清洁后固定于丙烯酸树脂中，并水平切片以暴露牙本质表面。每种材料均按照制造商的说明进行混合，应用于预制模具中覆盖暴露的牙本质，然后进行固化。将标本随机分为三组（每种材料6颗牙），并在（37摄氏度，100%湿度）下储存15分钟、24小时以及24小时，之后进行125次热循环（5摄氏度至55摄氏度）。使用Instron万能试验机对标本进行剪切粘结强度测试。除Miracle Mix和VariGlass VLC水门汀外，各时间组之间的差异无统计学意义，这两种材料在热循环后显示出更大的改善。本研究表明，FluoroCore树脂在核材料中表现出最大的剪切粘结强度，并且VariGlass VLC水门汀比Miracle Mix水门汀具有更高的粘结强度，但热循环后除外，此时VariGlass VLC水门汀和FluoroCore树脂无显著差异。
