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CAD/CAM Complete Denture Resins: An In Vitro Evaluation of Color Stability
Simon Gruber1, Porawit Kamnoedboon1, Mutlu Özcan2
1Clinic of General-, Special care-, and Geriatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
Purpose:
To evaluate the color stability of CAD/CAM complete denture resins.
Materials And Methods:
A total of 176 resin specimens were manufactured from conventional heat-polymerizing (pink: CONHCP : n = 16; tooth-shade: CONHCT : n = 16), CAD/CAM subtractively manufactured (pink: WIMP : n = 16, AVMP : n = 16, MEMP : n = 16, POMP : n = 16; tooth-shade: AVMT : n = 16, MEMT : n = 16, POMT : n = 16), and additively manufactured (pink: NDRPP : n = 16; tooth-shade: NDRPT : n = 16) denture resins; four different aging processes (thermal cycling, distilled water, red-wine, and coffee) were used. A spectrophotometer evaluated the color change (ΔE) using two modes of measurements (specular component included (ΔESCI ) and specular component excluded (ΔESCE )) recorded at baseline (T0 ) and at day#30 (T30 ). ANOVA and post hoc tests were used for statistical analysis (alpha = 0.05).
Results:
Additively manufactured resins (NDRPP and NDRPT ) demonstrated significant ΔE in comparison to the other groups in all aging media (p < 0.001). WIMP demonstrated higher ΔESCI in comparison to the other subtractively manufactured groups in distilled water (p < 0.001). In red-wine, AVMT revealed significantly more ΔESCE than POMT (p = 0.039). In coffee, the ΔESCE was higher for CONHCT than MEMT (p = 0.026) and POMT (p = 0.011). Similarly, in coffee the ΔESCE for AVMT was higher than POMT (p = 0.030).
Conclusion:
Additively manufactured denture resins demonstrated the maximum color change compared to conventional heat-polymerized and CAD/CAM subtractively manufactured denture resins. Furthermore, CAD/CAM subtractively manufactured denture resins were not inferior to conventional resins in terms of color stability.
