Dielectric properties and microhardness of some commercial types of dental glass ionomer cements

ABSTRACT

This study deals with four different dental glass ionomer cements. The aim of this present work was to study the electrical properties and microhardness for these materials, to show the correlation between these properties and to reach the most suitable one as regard tested properties. The results showed that the microhardness is inversely proportional to dielectric loss and the dielectric is proportional to AC conductivity indicating that the mechanism of dielectric polarization is similar to that of conduction. The results indicated that the dielectric and conductivity decreased with increasing temperature for all samples except for [Granitec Ionomer I] which gave a relatively constant values of epsilon[-] = 10[-5] and delta = beta x 10[-6] Ohm[-1] Cm[-1] and it can be concluded that this cement is the best one as regard electrical and hardness properties with respect to others under investigation