Assessment of visible light absorption using different curing cycles and colorant drinks. In vitro study

Abstract

ABSTRACT
Background: This study concerned with the stainability 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.
Keywords: Acrylic resin, spectrophotometer, colorant drinks. J Bagh Coll Dentistry 2009; 21(2):10-13)