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Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations

OBJECTIVE: To investigate the effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations. MATERIALS AND METHODS: Eighty specimens (shade A2 and A3, n = 10) (20 mm in length, 4 mm in width, 1.5 mm in thickness respectively) of casting ceramic (EM); alumina cer...

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Autor principal: Xu, Binting
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons, Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9292658/
https://www.ncbi.nlm.nih.gov/pubmed/34254726
http://dx.doi.org/10.1111/jerd.12802
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author Xu, Binting
author_facet Xu, Binting
author_sort Xu, Binting
collection PubMed
description OBJECTIVE: To investigate the effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations. MATERIALS AND METHODS: Eighty specimens (shade A2 and A3, n = 10) (20 mm in length, 4 mm in width, 1.5 mm in thickness respectively) of casting ceramic (EM); alumina ceramic (AL); zirconia ceramic (ZR); and porcelain‐fused‐metal (PFM) were prepared. The color distributions of each specimen were measured at 4 places using a spectroradiometer. The dentin/enamel porcelain (D/E) layer thicknesses of the 4 places were 0.8/0.2 mm, 0.6/0.4 mm, 0.4/0.6 mm, and 0.2/0.8 mm. The color differences (ΔE(00)) between the specimens and the corresponding color shade tabs were calculated. Data were analyzed using three‐way repeated‐measures ANOVA and Holm–Sidak pairwise comparisons (a = 0.05). The acceptability threshold (AT) was used to analyze the results. RESULTS: The minimum ΔE(00) values were 1.31 (0.6/0.4 mm for EM), 1.41 (0.8/0.2 mm for AL), and 1.92 (0.2/0.8 mm for ZR) for shade A2, and 0.93 (0.6/0.4 mm for EM), 0.89 (0.8/0.2 mm for AL), and 1.34 (0.8/0.2 mm for ZR) for shade A3. Most of them were below AT value (1.8). For AL and ZR (shade A2) and ZR (shade A3), the D/E layer thicknesses of 0.8/0.2 mm and 0.6/0.4 mm had lower ΔE(00) values than 0.4/0.6 mm and 0.2/0.8 mm (p ≤ 0.001). CONCLUSIONS: The dentin/enamel porcelain layer thickness that was most color‐matched to the shade tab was different for various ceramic restorations. The color of shade A2 AL and ZR and shade A3 ZR was closer to the shade tab when dentin porcelain was thicker than enamel porcelain. CLINICAL SIGNIFICANCE: Matching the shade of ceramic restoration to the shade tab color is a great challenge in esthetic dentistry. The dentin/enamel porcelain layer thickness is an important factor to influence the improved color matching.
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spelling pubmed-92926582022-07-20 Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations Xu, Binting J Esthet Restor Dent Research Articles OBJECTIVE: To investigate the effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations. MATERIALS AND METHODS: Eighty specimens (shade A2 and A3, n = 10) (20 mm in length, 4 mm in width, 1.5 mm in thickness respectively) of casting ceramic (EM); alumina ceramic (AL); zirconia ceramic (ZR); and porcelain‐fused‐metal (PFM) were prepared. The color distributions of each specimen were measured at 4 places using a spectroradiometer. The dentin/enamel porcelain (D/E) layer thicknesses of the 4 places were 0.8/0.2 mm, 0.6/0.4 mm, 0.4/0.6 mm, and 0.2/0.8 mm. The color differences (ΔE(00)) between the specimens and the corresponding color shade tabs were calculated. Data were analyzed using three‐way repeated‐measures ANOVA and Holm–Sidak pairwise comparisons (a = 0.05). The acceptability threshold (AT) was used to analyze the results. RESULTS: The minimum ΔE(00) values were 1.31 (0.6/0.4 mm for EM), 1.41 (0.8/0.2 mm for AL), and 1.92 (0.2/0.8 mm for ZR) for shade A2, and 0.93 (0.6/0.4 mm for EM), 0.89 (0.8/0.2 mm for AL), and 1.34 (0.8/0.2 mm for ZR) for shade A3. Most of them were below AT value (1.8). For AL and ZR (shade A2) and ZR (shade A3), the D/E layer thicknesses of 0.8/0.2 mm and 0.6/0.4 mm had lower ΔE(00) values than 0.4/0.6 mm and 0.2/0.8 mm (p ≤ 0.001). CONCLUSIONS: The dentin/enamel porcelain layer thickness that was most color‐matched to the shade tab was different for various ceramic restorations. The color of shade A2 AL and ZR and shade A3 ZR was closer to the shade tab when dentin porcelain was thicker than enamel porcelain. CLINICAL SIGNIFICANCE: Matching the shade of ceramic restoration to the shade tab color is a great challenge in esthetic dentistry. The dentin/enamel porcelain layer thickness is an important factor to influence the improved color matching. John Wiley & Sons, Inc. 2021-07-13 2021-10 /pmc/articles/PMC9292658/ /pubmed/34254726 http://dx.doi.org/10.1111/jerd.12802 Text en © 2021 The Author. Journal of Esthetic and Restorative Dentistry published by Wiley Periodicals LLC. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Xu, Binting
Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations
title Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations
title_full Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations
title_fullStr Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations
title_full_unstemmed Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations
title_short Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations
title_sort effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9292658/
https://www.ncbi.nlm.nih.gov/pubmed/34254726
http://dx.doi.org/10.1111/jerd.12802
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