CAD/CAM Complete Denture Resins: An In Vitro Evaluation of Color Stability
Simon Gruber, Porawit Kamnoedboon, Mutlu Özcan, Murali Srinivasan
Abstract
Abstract 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 HCP : n = 16; tooth‐shade: CON HCT : n = 16), CAD/CAM subtractively manufactured (pink: WI MP : n = 16, AV MP : n = 16, ME MP : n = 16, PO MP : n = 16; tooth‐shade: AV MT : n = 16, ME MT : n = 16, PO MT : n = 16), and additively manufactured (pink: ND RPP : n = 16; tooth‐shade: ND RPT : 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 SCI ) and specular component excluded (ΔE SCE )) recorded at baseline (T 0 ) and at day#30 (T 30 ). ANOVA and post hoc tests were used for statistical analysis (alpha = 0.05). Results Additively manufactured resins (ND RPP and ND RPT ) demonstrated significant ΔE in comparison to the other groups in all aging media ( p < 0.001). WI MP demonstrated higher ΔE SCI in comparison to the other subtractively manufactured groups in distilled water ( p < 0.001). In red‐wine, AV MT revealed significantly more ΔE SCE than PO MT ( p = 0.039). In coffee, the ΔE SCE was higher for CON HCT than ME MT ( p = 0.026) and PO MT ( p = 0.011). Similarly, in coffee the ΔE SCE for AV MT was higher than PO MT ( 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.