Effects of antibacterial coating on monomer exudation and the mechanical properties of denture base resins

Abstract Statement of problem Denture base resin may be exposed to different conditions for long periods, resulting in the loss of monomer by exudation and a decrease in mechanical properties. Purpose The purpose of this in vitro study was to evaluate monomer loss by exudation from denture base resins doped with antibacterial coatings and their mechanical properties after long-term water immersion. Material and methods Four kinds of dental base resin materials were used as experimental materials. The specimens of each resin were divided into an experimental group (coated) and a control group (uncoated). Monomer exudation was tested at 7 and 28 days by gas chromatography after materials were immersed in distilled water or a solution of 75% alcohol/distilled water. Flexural strength and elastic modulus were tested with a universal testing machine after immersion for 2 and 180 days. The surface morphology was characterized with atomic force microscopy. The data were analyzed using 3-way ANOVA followed by the Tukey-Kramer honest significant difference test (α=.05). Results In both of the immersion media, each of the 3 factors (materials, coating, and immersion time) significantly affected the monomer exudation ( P P P P P P Conclusions The silver-loaded mesoporous silica antibacterial coating can effectively reduce monomer exudation and enhance the flexural properties of denture base resin after immersion.