Color stability of polymer‐infiltrated‐ceramics compared with lithium disilicate ceramics and composite. Issue 1 (4th October 2019)

• Record Type: Journal Article
• Authors: Seyidaliyeva, Aida; Rues, Stefan; Evagorou, Zinonas; Hassel, Alexander J.; Rammelsberg, Peter; Zenthöfer, Andreas
• Is Part Of: Journal of esthetic and restorative dentistry. Volume 32:Issue 1(2020)
• Page Start: 43
• Page End: 50
• Publication Date: 2019-10-04
• Subjects: color stability -- composites -- hybrid ceramics -- lithium disilicate ceramics -- staining; Prosthodontics -- Periodicals; 617.6
• DOI: 10.1111/jerd.12525
• Languages: English
• ISSNs: 1496-4155

Abstract

Abstract: Objective: To investigate the color stability of hybrid ceramics and to compare it to composite and lithium disilicate ceramics. Materials and Methods: One hundred eighty samples were fabricated and processed with a semiautomatic grinding and polishing device (final step: 1200 grit). After thermocycling, samples were immersed in a staining solution (five subgroups: water, red wine, curry, black tea, cola) for 4 weeks. A spectroradiometer was used to determine the color of the samples in CIE L*a*b*. Color measurements were performed before staining (baseline, initial color), after thermocycling, after 2 and 4 week storage in staining solution and each after a two stage repolishing approach. Discoloration of specimens was calculated by means of Δ E 00 compared to baseline values. Results: All factors (material, staining solution, aging stage) were significantly associated with the extent of discolorations ( P < .001). Maximum color changes occurred after 28 days staining (EN: Δ E 00 = 4.5 ± 4.0; GB: Δ E 00 = 5.0 ± 4.5; LS: Δ E 00 = 3.0 ± 2.3) clearly exceeding the 50:50 threshold for acceptable color deviations. Due to repolishing, discoloration of LS samples was almost completely eliminated (Δ E 00 = 0.4 ± 0.3) and significantly reduced for the other two materials (EN: Δ E 00 = 1.0 ± 0.9; GB: Δ E 00 = 0.9 ± 0.4; P = .428). Conclusion: Discoloration of hybrid ceramics ranged in‐between lithium disilicate and composites, however more comparable to composites. Repolishing could reduce discolorations substantially. Clinical Relevance: This study should help dental practitioners to estimate the color stability of common dental materials and the effect of polishing in removal of discolorations.