Evaluation the Color Stability and Masking Ability of Darkened Teeth Treated With Two Kinds of CAD/CAD Veneer after Thermocycling
Journal Title: Journal of Dental Health and Oral Research - Year 2022, Vol 3, Issue 2
Abstract
Objectives: Evaluate color stability and masking ability of darkened substrate restored with two kinds of CAD/CAM veneer materials and the underlying light curing cement (light or neutral) after 1,000,000 thermomechanical cycles. And as a complementary analysis, the residual compression strength of the specimens that survived the thermocycles was carried out. Materials and methods: 60 indirect veneers (IPS e.max CAD and VITA Enamic) with 0.8 mm were prepared using the milling method and cemented on central incisors replicates, non-darkened (A2) or darkened (C4) with light-curing cement: neutral (N) or light (L) (n=10). Spectrophotometer measurements were performed 48h and 72h after cementation and after thermomechanical cycles (250,000; 500,000; 750,000 and 1,000,000). Color differences were evaluated by CIEDE2000 system (ΔE00). The perceptibility threshold was set at ΔE00 = 1.28 and clinical acceptability threshold was set at ΔE00 = 2.24. For the survived samples, compression test was performed as a complementary analysis after specimen ageing. Fractographic analysis was employed to observe fracture patterns. Data were analyzed by two-way ANOVA followed by post hoc Tukey test for color test and compression test by Kolmogorov-Smirnov, Shapiro-Wilk and Tukey test (5%). Results: independent the material and light curing cement used, they were capable to mask the darkened substrate and showed color stability over time, presenting ΔE00 < 0.7. After thermomechanical cycles, lithium disilicate ceramic presented higher residual compression strength and at fractographic analysis demonstrated brittle behavior. Polymer-infiltrated ceramic network presented a plastic deformation and chipping on the veneers’ edges. Conclusion: After 1,000,000 thermomechanical cycles, lithium disilicate ceramic and the polymer-infiltrated ceramic network veneers, processed by CAD/CAM with 0.8 mm and the underlying light curing cement presented color stability and could mask the darkened substrate over time.
Authors and Affiliations
Raphaela Farias Rodrigues1,2, Naiara Araújo de Oliveira1,3, Idiane Bianca Lima Soares1, Raphaelle Santos Monteiro4, Carlos Andres Villavicencio Espinoza1, Estevam Bonfante4, Ana Flávia Sanches Borges5*, Paulo Afonso Silveira Francisconi5
Keywords
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- EP ID EP704614
- DOI https://doi.org/10.46889/JDHOR.2022.3206
- Views 59
- Downloads 0
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