Impact of storage media and temperature on color stability of tooth-colored CAD/CAM materials for final restorations

Abstract

Background: This in-vitro study examined the impact of storage solution, storage duration, and storage temperature on discoloration of three tooth-colored CAD/CAM materials for final restorations. Methods: Specimens ( N = 288; n = 96 per material) with a thickness of 1 ± 0.03 mm of the following CAD/CAM materials were fabricated: resin composite (Lava Ultimate, 3M), polymer-infiltrated ceramic (VITA Enamic, VITA Zahnfabrik), and leucite ceramic (IPS Empress CAD, Ivoclar Vivadent). After baseline measurement, specimens were stored in red wine, curry solution, cress solution, and distilled water at 37°C or 55°C. The discoloration was measured using a spectrophotometer (Lambda 35 Perkin Elmer, Perkin Elmer Inc.) after 1 and 7 days storage. Data were analyzed using four-way ANOVA followed by the Scheffé post-hoc test and partial eta squared ( ηP²) test ( p < 0.05). Results: The highest influence on ∆ E was exerted by storage duration ( ηP² = 0.295, p < 0.001), followed by storage solution ( ηP² = 0.171, p < 0.001), CAD/CAM material ( ηP² = 0.049, p < 0.001), and storage temperature ( ηP² = 0.033, p < 0.001). Specimens stored for 7 days in staining solutions showed more discoloration than those stored for just 1 day. Higher ∆ E values were achieved for specimens stored in curry solution, followed by red wine, cress solution, and distilled water. Resin composite Lava Ultimate showed larger ∆ E values compared with the resin hybrid ceramic VITA Enamic and leucite ceramic IPS Empress CAD. Specimens stored at 37°C showed significantly less discoloration than those stored at 55°C. Conclusions: The degree of coloration of the materials depends on food and temperature and was most pronounced with Lava Ultimate.

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

“…The aging media selected for the purpose of this study are considered to be standard and have been employed in previous similar experiments 18–20,27,35–42 . Moreover, the spectrophotometry procedure is considered a gold standard in evaluating the color stability of resins 40,41 .…”

Surface Characteristics and Color Stability of Dental PEEK Related to Water Saturation and Thermal Cycling

“…The special chemical structure of PEEK exhibits stable chemical and physical properties [ 3 ]. PEEK has the lowest solubility and water absorption values compared to PMMA and composites, a good chemical resistance against almost all solvents with almost zero water uptakes compared to alloys and ceramics, and exceptional tribological properties [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ].…”

Six-year clinical outcomes of implant-supported acrylic vs. ceramic superstructures according to the All-on-4 treatment concept for the rehabilitation of the edentulous maxilla

“…Moreover, slight increase in bite force over the whole examination period could be explained by the adaptation of the masticatory muscles and corresponds to the results of the previous studies [ 31 ]. A slight difference between two groups at the 6 years examination could be explained by the fact that, acrylic teeth are subjected more pronounced to extrinsic and intrinsic stains and discolor over time [ 32 ].…”