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SEM observation of Resin-modified Glass Ionomer Cement

树脂改性玻璃离子水门汀的SEM观察

基本信息

批准号：
09671967
负责人：
ANDO Susumu
金额：
$ 1.92万
依托单位：
Nihon University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

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

树脂改性玻璃离子水门合剂（RGIC）的粘结强度据说不如树脂水门合剂。本研究项目的目的是通过评估剪切结合强度和比较SEM界面形态来评估自蚀刻引物对RGIC的影响。RGIC采用富士II型离子单体LC (GC)，固化单元GC采用New light IILC （GC）。一种由双甲基丙烯酸氧乙酯（Bis-MEP）、甲基丙烯酸2-羟乙酯（HEMA）、酚醌、丙酮和水为溶剂组成的实验性自蚀刻底漆（GC）。自蚀刻引物的丙酮含量分别为0、10、20、30、40、50 wt%。用#600 SiC纸研磨牛牙釉质，用自蚀刻处理剂、牙本质处理剂（GC）和牙本质处理剂（GC）处理。将水泥凝结成一个乙烯基模具（4x2mm），放在处理过的牙釉质表面，并进行光活化。剪切粘接强度试验采用万能试验机（4204型，Instron）在十字头速度下进行。在37*蒸馏水中保存24小时后为0mm/min。粘结强度测试结束后，在光学显微镜下进行x10倍放大镜检查，以确定粘结破坏的位置。用扫描电镜（JSM-5400， JEOL）观察处理后的牙釉质表面，用图像分析系统（MP-45200， JEOL）测量表面粗糙度（Rz值）。实验结果如下：1。自蚀处理剂处理的牙釉质结合强度明显高于牙本质处理剂和牙槽处理剂处理。添加热应力后，釉质的粘接强度降低，使用含有Bis-MEP的底漆时，粘接强度最高。富士ⅱ型LC的断裂模式在牙釉质界面处表现为粘连，在骨水泥处表现为部分粘连。随着自蚀刻底漆丙酮浓度的降低，水泥内聚破坏呈增加趋势。扫描电镜观察到，随着丙酮浓度的降低，釉质表面的蚀刻图案更清晰、更深。使用自蚀刻引物的SEM界面形貌与调理剂（如10% wt%和20% wt%的聚丙烯酸）相比，导致蚀刻图案变黄。少