Comparison of the hardness and microbiologic adherence of four permanent denture soft liners

Resilient denture linings cannot be used for extended periods due to the loss of softness and the adhesion of microorganisms on their surfaces. This study investigated the hardness and microbiologic adherence of four permanent soft denture lining materials. In addition, the adherence of Candida albicans and Staphylococcus aureus was studied in vitro by quantitative culture method and scanning electron microscopy (SEM). Surface properties of the materials also were observed with SEM. The hardness of all materials increased throughout the study. Molloplast-B was the most adequate permanent soft lining material for clinical use under these laboratory conditions.