Porosity of resin cements and resin-modified glass-ionomers.

Purpose: To quantify the internal free surface in various resin cements and glass-ionomer-based materials. Materials and Methods; Materials tested were Nexus fluid (NXF) and viscous (NXV), Vitremer (VTM), Fuji II LC (FII), Vitremer Luting Cement (VLC), Dyract (DYR) and Compoglass (COM). Samples (n=5) were made of each material between two microscopic glass slides under same weight. With a transmitted light microscopy, four zones of each sample were evaluated, finding the number of porosities per mm² (NP), the averaglass slidge radius of porosities (RP), the ratio of total area of surface porosities (µ²) to area (mm²) of specimen surface (TA) and the ratio of total volume of porosities (µ³) to area (mm²) of material surface (VP) Results: Median lest was used. NP: NXV, NXF and DYR had smaller NP than VTM and FII and (likely) than VLC (P> 0.0000001). RP was smaller for DYR than for VLC and (likely) than for NXV (P = 0.00019). TA: NXV, NXF and DYR had smaller TA than VTM, FII and VLC (P <0.0000001) VP: NXV and DYR had smaller VP than FII and (likely) than VTM and VLC (P< 0.0000001). [ABSTRACT FROM AUTHOR]

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