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

在这项研究中，我们测量了五种商用树脂水泥的孔隙度——panavia21 （Kuraray）、Imperva Dual （Shofu）、bite resin Cement （Tokuyama）、CR Inlay Cement （Kuraray）、Clapear DC (Kuraray)，并研究了孔隙度与这些树脂水泥的粘度、抗弯强度和耐磨性等特性之间的关系。粉末/液体型水泥的孔隙度是膏体/膏体型水泥的10倍。粉状/液体型胶结物有许多孔径大于30 μ m的孔隙，膏体/膏体型胶结物有许多孔径小于10 μ m的小孔隙。在碧石树脂水泥、Panavia21和Clapearl DC中，孔隙度与粘度呈负线性关系。在抗弯强度方面，越多孔的水泥强度越低。磨损损失顺序为CR嵌体水泥>Panavia21>Imperva Dual>Clapearl DC> bsitite Resin Cement。水泥的磨损随孔隙度的增大而增大。我们还观察了水泥的体内耐磨性。CR嵌体水泥和Panavia21的磨损损失倾向于高于其他水泥。然而，遗憾的是，我们没有发现水泥的孔隙度和耐磨性之间的关系。

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.