CAD/CAM Complete Denture Resins: An In Vitro Evaluation of Color Stability.

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: CON : n = 16; tooth-shade: CON : n = 16), CAD/CAM subtractively manufactured (pink: WI : n = 16, AV : n = 16, ME : n = 16, PO : n = 16; tooth-shade: AV : n = 16, ME : n = 16, PO : n = 16), and additively manufactured (pink: ND : n = 16; tooth-shade: ND : 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 (ΔE ) and specular component excluded (ΔE )) recorded at baseline (T ) and at day#30 (T ). ANOVA and post hoc tests were used for statistical analysis (alpha = 0.05).

Results: Additively manufactured resins (ND and ND ) demonstrated significant ΔE in comparison to the other groups in all aging media (p < 0.001). WI demonstrated higher ΔE in comparison to the other subtractively manufactured groups in distilled water (p < 0.001). In red-wine, AV revealed significantly more ΔE than PO (p = 0.039). In coffee, the ΔE was higher for CON than ME (p = 0.026) and PO (p = 0.011). Similarly, in coffee the ΔE for AV was higher than PO (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.