A new antimicrobial material, zeolite (Zeomic®), was added at concentrations of 0 (control), 1, 2, 3, 4 and 5% in the powder phase to a heat cured acrylic resin, and the effects of addition of this agent on the mechanical strength of acrylics and on the growth of Candida albicans were examined.Both mean tensile and bending strength decreased depending upon the dose of zeolite added, though, as compared with the control, 4% and 5% added specimens exhibited significantly low strength in both tests. These results suggest that the preferable concentration of addition of zeolite acrylic would be less than 4%, taking into account of mechanical strength.On the other hand, zeolite-combined acrylics, except 1%-specimen, showed significant fungicidal effects. Further, all zeolite-combined specimens showed significant growth inhibition of Candida albicans.These results, suggest the possibility of clinical use of this material, and that the optimal concentration of addition of zeolite is around 2%, in consideration of both mechanical properties and antifungal effects.