Influences on the bonding strength of resin-based cements for luting evaluated with setting behavior by the measurement of degree of conversion

通过测定剪切粘结强度、力学性能和无机填料含量，对7种树脂基粘结剂（5种复合型，2种PMMA/MMA型）进行了评价。将纯钛（10 × 10 × 2 mm）的结合表面抛光或用110μm氧化铝颗粒喷砂处理。粘接表面用金属底漆（Epicord）处理，然后用树脂基粘固剂与圆柱形钛试样（Φ 8 mm × 2 mm）粘接。使用万能试验机进行剪切粘结试验。使用固化树脂基水泥的圆柱形试样（Φ 6 mm × h3 mm）测量径向拉伸强度（XH）。此外，通过灰分法测量填料含量。用X射线荧光光谱分析了填料的组成。用背散射电子象观察了填料的特性，用110μm氧化铝颗粒喷砂处理的纯钛树脂基水泥的SBS为40- 75 MPa。这些SBS显著高于用底漆抛光的表面（2.0-3.7倍）。树脂基骨水泥的抗压强度为20- 50 MPa，且各骨水泥的抗压强度不同。SBS掺入量的增加与树脂基水泥的粘结强度关系不大，但粘结面均采用相同的底漆处理，复合型树脂基水泥的形状和组成各不相同，填料含量为66 ~ 75wt%。与树脂基复合材料相比，填料含量与吸湿性的关系不明显。这些结果表明，粘结强度不仅受树脂基水泥力学性能的影响，而且受水泥固化行为的影响很大。用FT-IR分析薄膜法测定树脂基水泥的转化率表明，尽管树脂基水泥为双固化型，但在无光固化的情况下，树脂基水泥仍表现出充分的固化。因此，分析树脂基水泥的固化行为对评价其粘结性能具有重要意义。

Seven kinds of resin-based cements for luting (5 composite type, 2 PMMA/MMA type) were evaluated by measuring shear bond strengths and mechanical properties, and inorganic fillers contents. Bonded surface of cp titanium (10x10x2mm) was polished or treated by sandblasting with 110μm alumina particles. The bonded surface was treated with a primer for metal (Epricord), then that was bonded by a resin-based cement with a cylindrical titanium specimen (Φ8mmx2mm). A shear bond test was performed using an universal testing machine. Diameteral tensile strength (DTS) was measured using a cylindrical specimen (Φ6mmxh3mm) of cured resin-based cements. Moreover, filler content was measured by an ash method. Composition of filler was analyzed by XRF. Filler was observed by backscattered electron images for the evaluations of characteristics.SBS of resin-based cements to cp titanium treated by sandblasting with 110μm alumina particles with a primer for metal showed 40-75MPa. These SBS were significantly higher than that of polished surface with a primer (2.0-3.7 times). DTS of resin-based cements showed 20-50MPa, and differed in each cement. There was a little relationship between the increased ratio of SBS and DTS of resin-based cements, nevertheless same primer treatment was applied for the bonded surface.Shape and composition of resin-based cements of composite type differed in each cement, and filler content showed 66〜75wt%. Relationship between filler content and DTS was not apparent comparing to resin composites. These result suggested that bond strength was influenced not only by mechanical properties of resin-based cements but also by curing behavior of cements greatly. Degree of conversion of resin-based cement by a film method analyzed with FT-IR indicated that a resin-based cement showed sufficient curing without light curing in spite of dual cure type. Therefore, analysis of curing behavior of resin-based cement was important to evaluate the bonding characteristics.