Volumetric dimensional changes of dental light-cured dimethacrylate resins after sorption of water or ethanol.

Objectives: This study evaluated the influence of water and ethanol sorption on the volumetric dimensional changes of resins prepared by light curing of Bis-GMA, Bis-EMA, UDMA, TEGDMA or D(3)MA.

Methods: The resin specimens (15mm diameterx1mm height) were immersed in water or ethanol 37+/-1 degrees C for 30 days. Volumetric changes of specimens were obtained via accurate mass measurements using Archimedes principle.

Dynamic thermomechanical properties and sorption characteristics of two commercial light cured dental resin composites.

Objectives: The first objective of this work is the study by DMTA of viscoelastic properties (E', E'', tandelta, Tg) of two current dental resin composites Tetric EvoCeram (nanohybrid) and Heliomolar (microfilled) in dry condition and in water for up to 30 days. The second objective is to determine the sorption characteristics of these composites in water and ethanol/water solution 75vol.%.