Assessment of visible light absorption using different curing cycles and colorant drinks : in vitro study

الملخص EN

Background : This study concerned with the attainability of acrylic resin cured by different methods of curing immersed in different colorant drinks and time intervals.

Materials and methods : Thirty-six specimens were prepared, eighteen specimen were cured by conventional (short cycle) and other eighteen specimens were cured by ivomate or pressure curing then the specimens immersed in different colorant drinks (Tea, Coffee and water), and the reading for amount of visible light absorption obtained at the end of each time intervals then the values obtained statistically analyzed by both ANOVA Table and students paired t-test .

Results : The short curing cycle significantly affect the color stability less than that of ivomate curing cycle when compare the results by using ANOVA Table, while comparing the measurement of visible light absorption at the end of each time intervals of both curing cycles by using student t-test show that samples made by using short curing cycle significantly higher stain resistance than that made by ivomate curing cycle.

Conclusion : Color stability affected by porosity, residual monomer and fog percentage presents in the acrylic resin samples.

those variables directly affected by heat and pressure applied in the curing cycle .so that reducing the heat and decrease pressure result in lowering their percentage.