Abstract

This study assessed the effect of different smear layers and surface conditioning on microtensile bond strength to dentin of two different glass-ionomer cements (GICs). Third molar teeth without caries were collected for this study. The crowns of teeth were cut to reveal the mid-coronal dentin surface, and then the specimens were randomly assigned to three groups for surface preparation (#180-grit, 600-grit, and #3000-grit SiC paper). After surface grinding, the specimens were restored by Equia Forte or Fuji II LC (GC, Tokyo, Japan). A buildup of each material was made by free-hand on the dentin surfaces with or without a polyacrylic acid conditioner. GIC/dentin sticks were obtained after 1 week storage and then stressed using a universal testing device. The fractured surfaces were examined by a stereomicroscope. Statistical analyses were performed with three-way ANOVA and Tukey’s post-hoc test (p < 0.05). GIC type and conditioner application had a significant effect on µTBS (p < 0.001). The smear layer conditions did not affect µTBS of the GICs (p = 0.113). Only Equia Forte without conditioner showed significantly higher µTBS on the #3000-grit surface than on #180-grit and #600-grit surfaces. Equia Forte presented significantly lower µTBS than Fuji II LC, with or without conditioner. With conditioner application, both GICs showed significantly higher µTBS on the #180-grit surface. The effect of different smear layers on µTBS was dependent on GIC type and conditioner application. The effectiveness of the conditioner application to the bond strength depended on the smear layer composition.

摘要

本研究评估了不同涂片层和表面处理对两种不同玻璃离子水门汀 (GIC) 与牙本质的微拉伸粘合强度的影响。为这项研究收集了没有龋齿的第三磨牙。切割牙冠以露出中冠牙本质表面，然后将样本随机分配到三组进行表面处理（#180-grit、600-grit 和#3000-grit SiC 纸）。表面研磨后，样品由 Equia Forte 或 Fuji II LC（GC，Tokyo，Japan）修复。在有或没有聚丙烯酸调理剂的情况下，徒手在牙本质表面上堆积每种材料。储存 1 周后获得 GIC/牙本质棒，然后使用通用测试设备进行应力处理。通过立体显微镜检查断裂表面。p  < 0.05)。GIC 类型和调理剂应用对 µTBS 有显着影响 ( p  < 0.001)。涂抹层条件不影响 GIC 的 µTBS ( p  = 0.113)。只有不加调理剂的 Equia Forte 在 #3000-grit 表面上的 µTBS 显着高于 #180-grit 和 #600-grit 表面。Equia Forte 的 µTBS 显着低于 Fuji II LC，无论是否使用调节剂。使用调理剂后，两种 GIC 在 #180 粒度表面上的 µTBS 显着提高。不同涂抹层对 µTBS 的影响取决于 GIC 类型和调理剂应用。调理剂应用对粘合强度的有效性取决于涂抹层的组成。