SEM observation of Resin-modified Glass Ionomer Cement

树脂改性玻璃离子水门汀（Resin-modified glass ionic cement，RGIC）与树脂水门汀相比，其粘接强度较差，本研究旨在通过剪切粘接强度和SEM界面形貌的比较，评价自酸蚀底漆对RGIC的影响。使用的RGIC是Fuji离聚物II型LC（GC），并且使用固化单元GC New light IILC（GC）。一种实验用自酸蚀底漆（GC），由双甲基丙烯酰氧基乙基磷酸酯（Bis-MEP）、甲基丙烯酸2-羟乙酯（HEMA）、康弗醌、丙酮和作为溶剂的水组成。自酸蚀底漆的丙酮含量范围为0、10、20、30、40和50重量%。用自酸蚀底漆、窝洞处理剂（GC）和牙本质处理剂（GC）对600号碳化硅砂纸磨面的牛牙釉质进行处理。将粘固剂冷凝到乙烯基模具（4x 2 mm）中，置于经处理的搪瓷表面上并光活化。使用万能试验机（4204型，Instron）以十字头速度进行剪切粘结强度试验 ...更多信息 在37 °蒸馏水中储存24小时后，在粘结强度测试之后，在放大倍数为xl 0的光学显微镜中检查断裂的试样，以确定粘结失效的位置。用扫描电镜（JSM-5400，JEOL）观察处理后牙釉质表面形貌，用图像分析系统（MP-45200，JEOL）测量表面粗糙度（Rz值）。自酸蚀底涂剂处理的牙釉质粘结强度显著高于牙本质处理剂和窝洞处理剂.随着热应力的增加，牙釉质的粘结强度降低，其中含Bis-MEP的底漆的粘结强度最高.富士II LC的断裂模式被认为是在釉质界面处的粘合剂和在水泥中的部分内聚。随着自酸蚀底漆中丙酮浓度的降低，粘结剂的粘结破坏有增加的趋势.扫描电镜观察，丙酮浓度越低，牙釉质表面的酸蚀纹越清晰，越深.与10wt%和20wt%的聚丙烯酸相比，使用自酸蚀底漆的SEM界面形貌导致蜡黄的蚀刻图案。少

Resin-modified glass ionomer cement (RGIC) is said to be inferior compared to resin cements on bond strength.The aim of this research project was to evaluate the effect of with self-etching primers on RGIC, by evaluating shear bond strength and comparing the SEM interfacial morphology. A RGIC used was Fuji ionomer type II LC (GC), and a curing unit GC New light IILC (GC) was employed. An experimental Self-etching primer (GC) composed of bis-metacryloxyetyl phosphate (Bis-MEP), 2-hydroxyethyl methacrylate (HEMA), comphorquinoe, acetone and water as solvent. Acetone content of self-etching primers was ranged of 0,10,20,30,40 and 50 wt%. Bovine enamel ground with #600 SiC paper was treated with self-etching primers, Cavity conditioner (GC) and Dentin conditioner (GC). Cement was condensed into a vinyl mold _4x2mm) put on the treated enamel surface and light activated. The shear bond strength tests were carried out using a universal testing machine (Type 4204, Instron) at a crosshead speed … More of 1 .0mm/min after 24 hours of storage in 37* distilled water. After bond strength testing, the fractured specimens were examined in an optical microscope at a magnification ofxl0 to define the location of bond failure. Treated enamel surface was observed by SEM (JSM-5400, JEOL) and surface roughness (Rz value) was measured by the Image analyze system (MP-45200, JEOL).The result were as follows :1. The enamel bond strengths were significantly increased with self-etching primer treatment compared with dentin conditioner and cavity conditioner treatments.2. The enamel bond strength decreased when the thermal stresses was added and the highest bond strength was obtained when the primer containing Bis-MEP was used.3. The fracture mode of Fuji II LC was found to be adhesive at the enamel interface and partially cohesive in -the cement. Cohesive failure in the cement tended to increase with decreasing acetone concentration of the self-etching primers.4. With the SEM observations of primed enamel surface, more clearly and deeper etching patterns were observed when the acetone concentrations were decreased.5. The SEM interfacial morphology using of the self etching primers resulted in the sallow etching patterns compare with conditioner such as 10 wt% and 20 wt% polyacrylic acid. Less