Discoloration of various CAD/CAM blocks after immersion in coffee

Abstract

ObjectivesThis study evaluated color differences (ΔEs) and translucency parameter changes (ΔTPs) of various computer-aided design/computer-aided manufacturing (CAD/CAM) blocks after immersion in coffee.Materials and MethodsEight CAD/CAM blocks and four restorative composite resins were evaluated. The CIE L*a*b* values of 2.0 mm thick disk-shaped specimens were measured using the spectrophotometer on white and black backgrounds (n = 6). The ΔEs and ΔTPs of one day, one week, and one month immersion in coffee or water were calculated. The values of each material were analyzed by two-way ANOVA and Tukey's multiple comparisons (α = 0.05). The ΔEs after prophylaxis paste polishing of 1 month coffee immersion specimens, water sorption and solubility were also evaluated.ResultsAfter one month in coffee, ΔEs of CAD/CAM composite resin blocks and restorative composites ranged from 1.6 to 3.7 and from 2.1 to 7.9, respectively, and ΔTPs decreased. The ANOVA of ΔEs and ΔTPs revealed significant differences in two main factors, immersion periods and media, and their interaction except for ΔEs of TEL (Telio CAD, Ivoclar Vivadent). The ΔEs significantly decreased after prophylaxis polishing except GRA (Gradia Block, GC). There was no significant correlation between ΔEs and water sorption or solubility in water.ConclusionsThe ΔEs of CAD/CAM blocks after immersion in coffee varied among products and were comparable to those of restorative composite resins. The discoloration of CAD/CAM composite resin blocks could be effectively removed with prophylaxis paste polishing, while that of some restorative composites could not be removed.

Materials in digital dentistry—A review

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“…Composition of CAD/CAM silicate ceramics, properties, and preparation requirement can be found in Table …”

“…42 Composition of CAD/CAM silicate ceramics, properties, and preparation requirement can be found in Table 4. 11,12,14,16,29,32 2.9 | Oxide ceramics enon is referred to as transformation toughening. 43 The first generation lacked translucency, and were required to be veneered with feldspathic porcelain to make them esthetically acceptable.…”

Long‐term stainability of interim prosthetic materials in acidic/staining solutions

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“…However, other studies have shown that different resins present similar Δ E values . Some studies have shown a superior behavior of composites for CAD/CAM . In the meantime, no study compared or evaluated the Δ E of composites for CAD/CAM systems in comparison to the composites of conventional laboratory processing in acidic/staining solutions in short and long periods of immersion.…”