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7种树脂基水泥（5种复合型，2种PMMA/MMA型）的剪切粘结强度、力学性能和无机填料含量，对其进行了评价。采用110μm氧化铝颗粒对cp钛（10x10x2mm）粘结表面进行抛光或喷砂处理。粘合表面用金属底漆（Epricord）处理，然后用树脂基水泥与圆柱形钛试件（Φ8mmx2mm）粘合。采用万能试验机进行剪切粘结试验。直径抗拉强度（DTS）测量使用圆柱形试样（Φ6mmxh3mm）固化树脂基水泥。此外，采用灰分法测定填料含量。用XRF分析了填料的组成。采用背散射电子图像对填料进行观察，评价填料的特性。用110μm氧化铝喷砂处理树脂基水泥对cp钛的SBS为40 ~ 75mpa。这些SBS显著高于底漆抛光表面（2.0 ~ 3.7倍）。树脂基水泥的DTS值为20 ~ 50mpa，不同水泥的DTS值不同。树脂基胶结物的SBS增加率与DTS增加率之间关系不大，但粘接表面采用相同的底漆处理。每种水泥的复合型树脂基水泥的形状和组成不同，填料含量为66 ~ 75wt%。与树脂复合材料相比，填料含量与DTS的关系不明显。结果表明，胶结强度不仅受树脂基胶结物力学性能的影响，还受胶结物固化性能的影响。薄膜法对树脂基水泥的转化程度进行了FT-IR分析，结果表明树脂基水泥在没有光固化的情况下，即使采用双固化方式，也能得到充分的固化。因此，分析树脂基水泥的养护行为对评价树脂基水泥的粘结特性具有重要意义。

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.