Aim: The aim of this study was to compare the effects of different surface finishing treatments applied to two different CAD/CAM materials on the color stability after thermal aging with coffee and cola.
Materials and Methods: Polymerized resin nanoceramic (LAVA Ultimate, LU) and lithium disilicate glass-ceramic (IPS e.max CAD, EC) were examined in the study. The samples with A1 HT color at a size of 14 x 12 mm and a thickness of 0.5 ± 0.05 mm were prepared from these ceramic materials (N=144). Color measurement of each specimen was calculated with a spectrophotometer using color parameters on a gray backing between baseline color, polishing/glazing and after 5000 cycles of coffee and cola thermocycling. ANOVA and the Fishers LSD test were used for testing statistical significance (p < 0.05).
Results: LU exhibited higher color change values than EC after thermal aging. In the EC group, glazing provided statistically different results as compared to the manual and control groups (p < 0.05). The lowest color change for all stages was observed in IPS e.max CAD ceramics that were treated by glazing.
Conclusion: In terms of color stability, glazing can be recommended for EC, and manual polishing as an alternative to glazing for LU.
Key words: CAD/CAM; ceramics; prosthodontics.
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