Resiliency of surface-sealed temporary soft denture liners

Statement of problem. Studies have suggested that coating a temporary soft denture liner with a semiset methyl methacrylate resin extends the period of resiliency of the liner. Purpose. This study determined whether coating three temporary soft denture liners with two different denture surface sealants, followed by thermocycling, affected the resiliency of the liners. Material and methods. Thirty 20 × 12.5 mm cylindrical samples each of Lynal, Coe Soft, and Visco-Gel soft lining materials were prepared and divided into three groups of 10 uncoated samples, 10 Palaseal-coated samples, and 10 mono-poly coated samples. Samples were thermocycled from 5° C to 45° C for 500 cycles and then compressed 10 mm on an Instron universal testing machine. Resiliency was determined by measuring the energy absorbed by the soft liners when stressed to a specific yield point. Results. Two-way ANOVA indicated a significant difference among materials ( p = 0.0001) and among treatments ( p = 0.0001). One-way ANOVA of each material group revealed a significant difference among Lynal groups ( p = 0.0001) and a significant difference among Visco-Gel groups ( p = 0.030). Conclusions. Surface-coating Lynal samples with Palaseal or mono-poly and Visco-Gel samples with Palaseal significantly increased the resiliency of these samples in the laboratory when compared with uncoated samples. (J Prosthet Dent 1997;77:370-4.)