Porosity in posterior composite resins -

The percent pore area and the mean pore size were measured in specimens made of nine brands of composite resin restorative materials. The overall percent porosity ranged from 0.01 to 4.5%

Compressive creep of light cured resin based restorative materials. -

Creep characteristics of four light activated composite of different composition were determined at 37 and 50 degrees C. The creep properties were compared with the composition of the materials.