Surface roughness and gloss of indirect composites etched with acidulated phosphate fluoride solution Ohara N et al. - Specific filler particles of prosthodontic composite materials were etched by APF application. The surface roughness parameters, such as Rz and RSm, properly described various surface topographic features. Gloss was strongly correlated to surface roughness, as defined by these parameters, and especially to the initial change of surface roughness. [more...]