Relationship between wear resistance and porosity of resin cements formed by mixing.

本研究测量了Panavia21(Kuraray)、Imperva Dual(Shofu)、Bisite树脂水泥(Tokuyama)、CR嵌体水泥(Kuraray)、Clapear DC(Kuraray)五种商用树脂水泥的孔隙率，并研究了这些树脂水泥的粘度、弯曲强度和耐磨性等特性与孔隙率的关系。粉状/液态水泥的孔隙度是糊状/糊状水泥的10倍。粉状/液态水泥有许多直径大于30微米的小孔，而糊状/糊状水泥有许多小于10微米的小孔。在Bisite树脂水泥、Panavia21和Clapearl DC中，孔隙率与粘度呈线性负相关。至于抗折强度，孔隙率越高的水泥强度越低。磨损量大小顺序为：CR嵌体粘固剂；Panavia21；Imperva Dual；Clapearl DC；水泥的磨损量随孔隙率的增加而增加。我们还观察了粘固剂的体内耐磨性。CR嵌体粘固剂和Panavia21粘固剂的磨损量明显高于其他粘固剂。然而，遗憾的是，我们在体内还没有发现骨水泥的孔隙率与耐磨性之间的关系。

In this study we measured the porosity of five commercial resin cements-Panavia21 (Kuraray) , Imperva Dual (Shofu) , Bistite Resin Cement (Tokuyama) , CR Inlay Cement (Kuraray) , Clapear DC (Kuraray) and investigated the relationship between the porosity and the characteristics such as viscosity, bending strength and wear resistance of these resin cements. The degree of porosity in the powder/liquid typed cements was ten-times as large as that in paste/paste typed cements. The powder/liquid typed cements had many pores of which diameter was more than 30 mum, while paste/paste typed cements had a lot of small ones less than 10 mum. In Bistite Resin Cement, Panavia21 and Clapearl DC,there were negative liner relationship between the porosity and viscosity. As for bending strength, more porous cements presented lower strengths. The order of wear loss was CR Inlay Cement>Panavia21>Imperva Dual>Clapearl DC>Bistite Resin Cement. The wear loss of the cements increased with the porosity. We also observed the wear resistance of the cements in vivo. The wear loss of CR Inlay Cement and Panavia21 was tended to be higher than those of other cements. However, unfortunately we could not find the relationship between the porosity and wear resistance of cements in vivo.