Hygroscopic setting expansion of gypsum-bonded investment under restrictive stress in dental casting

The phenomenon of hygroscopic setting expansion of gypsum-bonded investment under restrictive stress for dental casting was studied. The analysing method for normal setting expansion proposed in previous studies was also applied to hygroscopic setting expansion under uniaxial stress and within an acrylic ring. Furthermore, hygroscopic setting expansion within a stainless steel ring with an asbestos liner was analysed under dental casting conditions in relation to the calculation method proposed by the authors.