[Comparative material studies on dental stones in accordance with DIN 13911]

It was the object of this investigation to compare nine high-strength stone plasters in terms of visual appearance, pouring time, setting time, setting expansion, compressive strength and detail reproduction in accordance with DIN 13911 and ISO 6873 using both standard consistency as indicated in the industrial standard and the water-to-powder ratio as indicated by the manufacturer. None of the tested stones met the visual requirements in all points. Regarding their physical properties, six tested stones were up to standard. Three stones failed to meet the DIN and ISO requirements. Following the manufacturer's mixing instructions resulted in a significant improvement in material properties as against standard consistency. Disregarding some minor improvements required, DIN 13911 and ISO 6873 are useful standards for a standardized comparison of dental plasters.