ABSTRACT
To compare the color stability of heat cure acrylic resin after immersion in distilled water and denture cleansers. In-vitro experimental study. Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences, Dow University of Health Sciences and Al-Karam Textiles, Karachi, from January to April 2012. Seventy two rectangular shaped specimens; 18 specimens were measured at baseline [control group] of the study [0 day], 18 specimens were immersed in distilled water. Eighteen [18] in Fittydent denture cleanser tablets for 10 minutes and eighteen [18] in Dentipur denture cleanser tablets for 10 minutes. Specimens were polished and stored in istilled water for 24 hours prior to experiment. After 60 days of immersion, the specimens were tested for color changes with spectrophotometer. SPSS 16 was used for statistical analysis. There was statistically significant difference in the color change [delta E] among all groups [p < 0.001] after 60 days of immersion. At baseline [0 day], trace amount of color change was observed whereas when specimens were immersed in Fittydent denture cleansers tablets for 60 days noticeable change in color was observed. Very slight change in color was bserved when specimens were immersed in distilled water and dentipur denture cleanser solution. The color stability of denture base acrylic resin was influenced by the type of denture cleansers used
ABSTRACT
Resin-based composite dentures or teeth are used as replacement of missing teeth. Their success depends largely on their colour stability as they undergo discoloration after prolonged exposure in oral environment and therefore, need replacement for esthetic reasons. To evaluate the colour stability of a nanofill composite resin [Filtek Z350] when exposed to different immersion media. Study design and settings: An in-vitro experimental study was carried out at Dr. Ishrat-ul-ebad Khan Institute of Oral Health Sciences and colour testing was done at Al Karam textiles limited. Forty resin-based composite specimens measuring 1 mm. of thickness and 5x5 mm. in length and breadth were prepared using a plastic sheet. Specimens were light-cured for 20 seconds from both sides and were randomized into 4 groups [n=10] according to immersion solutions: distilled water [control], coke, turmeric powder solution and coffee solution. Specimens were left immersed in these solutions for 10 days A digital spectrophotometer was used to evaluate the colour changes after 10-days and the colour differences [deltaE] were analyzed using paired t-test [p < 0.05]. After 10 days of immersion in coffee solution, coke and turmeric powder solution specimens showed significant colour change. The turmeric powder exhibited maximum staining followed by coffee and coke. The composite resin was susceptible to staining by coffee, turmeric powder and coke