Water absorption and solubility of coated and non–coated silicone–based permanent soft liner


AIMS: To determine the period of time that a new generation of silicone–based, chairside, permanent soft liner resist absorption and solubility and determine the effect of coating material. MAERIALS AND MEHODS: Specimens of (Mucopren soft) soft liner were prepared, stored in water, and tested after 1 , 2 , 3 , and 8 months. Half of the specimens were coated with coating material supplied by manufacturer and the other half remained uncoated. Silica gel was used for drying and sensitive elec-tronic balance was used for weighing specimens. Universal formulas were used for calculating water absorption and solubility. T–test and ANOVA followed by Duncan multiple range test were used to determine the significant difference at P<0.05 level. RESULS: There was no statistically significant difference between coated and non–coated soft liner in relation to water absorption and solubility. There was no statistically significant difference in water absorption and solubility when comparing it among the periods of testing from the first month to the eighth months. Coating the soft liner decrease the percentage absorption and solubility of the silicone soft liner but this effect is statistically not sig-nificant. CONCLUSIONS: Mucopren soft– lining material has proved excellent resistance to solubili-ty for a long period (8 months). Water absorption is limited and are clinically accepted. Coating (Mu-copren soft) soft liner with coating material slightly improve the resistance to water absorption and solubility.