光重合型コンポジットレジンの水中下での静的および動的試験による力学特性

抄録

One of the materials used to repair caries and dental defects is light-cured dental restorative materials. This material has been widely used in recent years because it is more aesthetic than conventional metal materials and does not cause allergic reactions. However, it may deteriorate due to absorption of water such as saliva and beverages, which may affect the mechanical properties. In this study, a fatigue test was conducted with the light-cured dental restorative materials immersed in ion exchange water at 37 oC and 60 oC in the atmosphere, and the effect of water absorption on the mechanical properties was investigated. As a result, it was confirmed that the mechanical properties of the composite resin are affected by water absorption. It was also found that the effect of water absorption is enhanced slightly as the immersion temperature is elevated. Furthermore, SEM observation was performed to observe the difference in fracture surface due to water absorption. However, from the observation of the fracture surface, there was not much difference between the atmosphere and the state immersed in ion exchange water. In the future, we would like to investigate the influence of water absorption on the failure mechanisms by numerical analysis using the finite element method.