The Effect Of Surface Treatment And Thermocycling On Bond Strength Between Silicon Soft Denture Lining And Acrylic Resin Denture Base

Introduction: Silicon Soft Denture Liner (SDL) is often used along with heat polymerization acrylic resin (PMMA) as an obturator material because it can cover the undercut area in a broad defect for long term and painlessly. Despite that, silicon SDL and PMMA have different molecular structures so that they have a low bond strength. Long-term use can also affect the bond strength, so there is a need to increase the bond strength between PMMA and SDL. A method to increase the bond strength is surface treatment. This study is conducted to determine the effect of surface treatment and thermocycling on the bond strength of PMMA and Silicon SDL. Methods: The study used 40 samples (8 groups) divided into 4 groups based on the surface treatments, namely no surface treatment, sandblast, adhesive primer and combination, and further divided into two groups of thermocycling and without thermocycling treatment. The bond strength between PMMA and SDL was tested with tensile test by using Universal Testing Machine (UTM). Results: One-way ANOVA analysis showed there were significant differences of the bond strength among all groups (p <0.05) where the adhesive primer showed the highest value in all treatment groups. Conclusion: There is an effect of surface treatment and thermocycling on the bond strength between the PMMA and SDL, where the adhesive primer as a surface treatment material shows the highest bond strength of all.