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The Influence of Thermal Curing Cycles on the Color Stability of Unfilled Polymethyl Methacrylate Teeth
Ram Basany1, Vinod Bandela2, Kulashekar Reddy Nandalur3
1Prosthodontics, Sri Venkata Sai (SVS) Institute of Dental Sciences, Mahbubnagar, IND.
Purpose:
The purpose of this study was to evaluate the influence of water bath polymerization cycles on the color stability of unfilled polymethyl methacrylate (PMMA) teeth.
Materials And Methods:
A total of 72 samples of unfilled PMMA were divided into two groups. Group 1 was subjected to a short curing cycle and group 2 to a long thermal curing cycle. Color measurements were done using a spectrophotometer and evaluated by the Commission Internationale de l'Eclairage (CIE) L*a*b* color system. Color difference (∆E) was calculated before and after thermal curing cycles and the data were statistically analyzed.
Results:
Group 2 teeth exhibited the highest ΔE values and color change to long curing cycle with significant difference between them.
Conclusion:
All the ΔE values were below 3.3, indicating that the color changes are not clinically perceptible.
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