[Effect of water on the binding firmness of construction materials in fixed aesthetic prostheses].

The authors investigated the problem of the effect of a damp environment on the mechanical properties of aesthetic materials used for fixed prostheses (top lacques Conalor and polymethylmetacrylate resin Superpont C and B). For tests they used bodies made from chromium cobalt alloy with two types of retention--R-polymer and loop. In the combination metal-resin the differences of values are significant, when the top lacquer Conalor is used, the changes of values are not so maded to be statistically significant. A traction test of bodies prepared from Superpont C + B wal also to assess the range of firmness in relation to the period of storage in distilled water. The authors found an increase of the range of firmness within one week and a marked decline after two weeks. The performed tests provided evidence of a rise of the binding firmness due to the absorption by the resin, and confirmed the stabilized behaviour of the lacquer Conalor.