A series of experiments were conducted on dental denture base resins for their antibiosis. They were also compared in terms of physical and mechanical characteristics, which led to the following results: 1. As for bacterial deposition, the old products showed a wide range of distribution, while those products containing C. S. had restraints. 2. Among the products containing C. S., those ones of 7, 12 and 20% all had restraints of similar size to slop further bacterial growth. In the meanwhile, the old products had only small-size restraints for bacterial growth. 3. The following changes were observed in the aspect physical characteristics: There were no significance between the old products and the C. S. products. Thus, as for compressive force, the average${pm}$standard deviation of the old products was $27.4083.{pm}1.7397$, and those C. S. products of 20% showed the similar $27.5600{pm}.1976$. In addition, there were no significance between the old products and those ones containing C. S. in terms of tensile force. The tensile force of the old products was $114.5600{pm}.8916$ in average${pm}$standard deviation, while there was no differences among the C. S. products of 7, 12, and 20% in that matter.