Comparative evaluation of colour stability of conventional, 3d printed and cad cam fabricated provisional restorations- An in-vitro study

The temporization phase in fixed prosthodontics is vital for restoring function, esthetics, and protecting prepared teeth. Provisional restorations, traditionally made using PMMA, ensure interim comfort and diagnostic value. With advancements in digital technology, 3D printing and CAD/CAM milling have enhanced the precision and efficiency of temporary restorations. However, the effects of betel leaf, commonly chewed in Indian culture, on the color stability of these materials remain unexplored. This study evaluates and compares the color stability of conventional, 3D-printed, and CAD/CAM-fabricated provisional restorations when immersed in betel leaf solution The provisional crowns measuring 2mm thickness made of PMMA (Polymethyl methacrylate) were evaluated for color stability with spectrophotometer using CIELAB values. The mean ΔE values were significantly higher for the conventional group, followed by 3D printed and CAD CAM groups. The conventional Polymethyl methacrylate specimens changed color more and faster than the CAD CAM and 3D printed crowns. In addition, at 3 and 6 months, the color variations of conventional method at all time intervals were unacceptable when compared to their initial shade.