Saudi Dent J. 2025 Oct 15;37(7-9):63. doi: 10.1007/s44445-025-00071-6.
ABSTRACT
The colour stability of occlusal devices is a critical factor in their long-term aesthetic performance. This in vitro study aimed to evaluate and compare the colour stability of 3D-printed, thermoplastic, and conventional resin materials used in occlusal devices under extrinsic and intrinsic factors. In vitro – comparative study. Sixty rectangular specimens (15 × 15 × 2 mm) of Dentaclear (CAD/CAM 3D-printed), IMPAK (CAD/CAM milled thermoplastic), and ProBase Hot (heat-polymerised) resins were fabricated. Each material group consisted of 20 specimens, with 10 assigned to a control group (immersed in artificial saliva(serving both as the control group and as the intrinsic factor) and 10 to a test group (subjected to 5000 thermocycles in coffee). Baseline colour measurements (L*, a*, b*) were obtained using a spectrophotometer with D65 standard illumination. Colour changes (ΔE00) were calculated using the CIEDE2000 formula, and statistical analysis was performed using 2-way ANOVA (α = 0.05). 2-way ANOVA (α = 0.05). Significant colour changes (ΔE00) were observed in all materials following coffee thermocycling (P < .001). ProBase Hot exhibited the lowest ΔE00 values, indicating the highest colour stability, while IMPAK and Dentaclear showed higher ΔE00 values, with no significant difference between them (P = .287). The control group showed minimal colour change, indicating the negligible effect of intrinsic factors like saliva. Coffee thermocycling significantly impacted colour stability, with ProBase Hot demonstrating superior colour stability compared to IMPAK and Dentaclear. Intrinsic factors like Saliva had minimal influence on colour stability when compared to extrinsic factors like coffee.
PMID:41091420 | DOI:10.1007/s44445-025-00071-6
