Resilient lining materials for dentures.

Modern resilient liners may be broadly classed as plasticized resins, silicone rubbers and fluoropolymers. Desirable properties would be pronounced softness and resiliency, or visco elasticity. Compression tests of Molloplast B (a silicone rubber), Kurepeet (a fluoropolymer), Visco-gel (a tissue conditioner) and Xantopren ( a silicon impression material) (as control) showed a displacement of 4% and recovery to 0.4% permanent deformation after 15s of loading for Molloplast and Xantopren, and up to 32% and 13% displacement respectively for Visco-gel and Kurepeet followed by considerable permanent deformation. Recovery of the latter showed a typical curve for visco-elasticity. The small amount of initial deformation of the elastic materials on the other hand indicated unyielding and consequently unsatisfactory properties. The deformation of Kurepeet was not as great as Visco-gel but the fact that it was visco-elastic meant that it was likely to be a suitable long-term lining material. It therefore complied with requirements that a resilient denture liner should be soft and visco-elastic.