An evaluation of water absorption of giomer in comparison to other resin-based restorative materials

Abstract EN

Background : polymeric composites have been widely used as dental restorative materials.

A fundamental knowledge and understanding of the behavior of these materials in the oral cavity is essential to improve their properties and performance.

The goal of this study was to measure water sorption of four composite resins containing different filler and resin matrix contents.

Materials and method: Resin composite specimens giomer (Beautifil II) Filtek™ P90, Filtek™ Z350 XT, and Tetric NCeram were prepared in a cylindrical mould of 3mm thickness and 6mm diameter (n = 10) and light cured .

All specimens placed in silica-gel desiccators at 37˚C for seven days, a constant weight was obtained.

All samples were immersed in deionized distilled water at 37˚C and weighed at suitable time interval once a week for 30 days.

Water sorption was calculated based on ISO 4049.

Data were subjected to student t-test.

Results : silorane and Giomer composites showed the lowest values of water sorption, while Z350 and Tetric N-Ceram displayed the highest values at a period of 4 weeks..

Conclusion : each resin- matrix composite varied in water sorption which may affect clinical service.

The attained water sorption values are mainly influenced by the generic type of material and variations occurring between materials of the same type may result from differences in resin matrix compositions.