Abstract

Aim: To evaluate the effect of adding calcium carbonate nanoparticles (CaCO3NPs) to soft denture lining material on radiopacity, hardness and surface roughness of the lining material. CaCO3NPs with 1.5% and 2% concentration by weight were added into acrylic-based heat cured soft denture lining material.

Methods: Pilot study was carried out to select the best percentage of CaCO3NPs by experimenting their effect on radiopacity, shore A hardness and surface roughness of soft denture liner. Four concentrations of CaCO3NPs were used (0.5%, 1%, 1.5%, and 2%).

Results: Ninety specimens were prepared according to the tests to be formed. The radiopacity of the composite of soft liner/CaCO3NPs was evaluated, shore A hardness and surface roughness were also measured, the results showed that there was a highly significant increase in radiopacity and shore A hardness of the experimental specimens in comparison with the control specimens ,while non-significant difference in the surface roughness was observed in experimental specimens.

Conclusion: The addition of CaCO3NPs can provide soft liner material with improved radiopacity and shore A hardness, while surface roughness was non-significant changed when the concentration of CaCO3NPs increased.

Keywords: Soft denture liner, radiopacity, shores A hardness, surface roughness