Miguel Calvo, AliciaMacorra García, José Carlos De LaNevado Rodríguez, SilviaGómez López, Javier2023-06-202023-06-202001-020894-8275https://hdl.handle.net/20.500.14352/60376Purpose: 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 vicous (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 average 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 (µ²) to area (mm²) of material surface (VP). Results: median test was used. NP: NXV, NXF and DYR had smaller than VTM and FII ans (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).spajournal articleopen accessMateriales dentales3213.13 Ortodoncia-Estomatología