Comparisons the microhardness of different cured acrylic denture base systems after subjected to chemical cleaning solutions

Abstract

In selecting chemical cleaning solutions for dental prostheses, compatibilitybetween them and the type of denture base materials must be considered to avoidadverse effects on the hardness of the acrylic resin in different curing systems. Thisstudy aimed to compare the effect of different disinfectant and denture cleanser on thesurface hardness of the light and heat cured acrylic resin materials. Eighty specimensare made from two different denture base materials. Forty specimens are made oflight cured acrylic and forty specimens are made of heat cured acrylic resin. Eachmaterial is subdivided into four subgroups according to the type of the disinfectant(0.12% chlorhexidine digluconate, 0.5% sodium hypochlorite), the denture cleansers(Corega) and compared to the distilled water as control group. The surface hardnesstest is measured for each specimen to show the effect of each chemical cleaningsolution on the light and heat cured denture base hardness. The results of the presentstudy showed non significant differences in the surface hardness comparing betweenthe two curing systems light and heat cured acrylic resin. Also there are nonsignificant differences in the surface hardness when different disinfectant and denturecleansers have been used in comparison to the distilled water. It was concluded fromthis study that the hardness of acrylic materials is not affected by immersion in anytype of disinfectant and denture cleanser as well as it is found that there is no differentin the hardness of the light cured when compared to the heat cured acrylic denturebase.