DOI: 10.36347/sjds.2021.v08i08.003

Pages: 264-270

Heat polymerized poly methyl methacrylate is the most commonly used denture base material. Selecting a denture cleanser, compatibility between various type of denture base material and cleanser must be considered to avoid harmful effects. Study objective was to evaluate the changes in flexural strength and colour change of heat cured denture base resins when treated using denture cleansers. Method: The disk shaped specimens15mm in diameter and 4mm in thickness and rectangular shaped specimens 65mm x 10mm x 3.3mm were fabricated using split mould technique. A total of 60 standardized specimens were fabricated and stored in distilled water for 24hrs. After 1 day, the specimens were appropriately labelled and immersed in groups of 20 to prepared denture cleanser solutions for treatment. Solutions were prepared and immersed according to manufactures instructions (Corega tab: one tablet to 200ml of water and immersion time is 15min; Fitty dent: one tablet to 200ml of water and immersion time is 30min). After immersion, the resin specimens will be removed, thoroughly cleanedunder running water, dried with absorbent paper, and then the procedure of immersion will be repeated. This procedure will be performed for a total of 30 times over a period of 6 days simulating patients180 days of cleansing. 10 specimens of each group where tested for flexural strength using universal testing machine. Specimens were loaded until fracture occurred. The peak load was recorded in Newton and the flexural strength was calculated from peak load and another 10 specimens were tested for colour change using spectrophotometer .The specimens were tested on the measuring head of the spectrophotometer. The colour characteristics, tristimulus values X, Y, Z, and CIE (Lab) of specimens, were evaluated. The findings were statistically analysed using ONE -WAY ANOVA and students T test. Results: Heat cure denture base resin used for this study showed significant difference in flexural strength and.....