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Masking ability of a zirconia ceramic on composite resin substrate shades

BACKGROUND: Masking ability of a restorative material plays an important role to cover discolored tooth structure; however, this ability has not yet been well understood in zirconia-based restorations. This study assessed the masking ability of a zirconia ceramic on composite resin substrates with d...

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Autores principales: Tabatabaian, Farhad, Shabani, Sima, Namdari, Mahshid, Sadeghpour, Koroush
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713062/
https://www.ncbi.nlm.nih.gov/pubmed/29238377
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author Tabatabaian, Farhad
Shabani, Sima
Namdari, Mahshid
Sadeghpour, Koroush
author_facet Tabatabaian, Farhad
Shabani, Sima
Namdari, Mahshid
Sadeghpour, Koroush
author_sort Tabatabaian, Farhad
collection PubMed
description BACKGROUND: Masking ability of a restorative material plays an important role to cover discolored tooth structure; however, this ability has not yet been well understood in zirconia-based restorations. This study assessed the masking ability of a zirconia ceramic on composite resin substrates with different shades. MATERIALS AND METHODS: Ten zirconia disc specimens, with 0.5 mm thickness and 10 mm diameter, were fabricated by a computer-aided design/computer-aided manufacturing system. A white substrate (control) and six composite resin substrates with different shades including A1, A2, A3, B2, C2, and D3 were prepared. The substrates had a cylindrical shape with 10 mm diameter and height. The specimens were placed onto the substrates for spectrophotometric evaluation. A spectrophotometer measured the L*, a*, and b* values for the specimens. ΔE values were calculated to determine the color differences between the groups and the control and then were compared with a perceptional threshold (ΔE = 2.6). Repeated measures ANOVA and Bonferroni tests were used for data analysis (P < 0.05). RESULTS: The mean and standard deviation of ΔE values for A1, A2, A3, B2, C2, and D3 groups were 6.78 ± 1.59, 8.13 ± 1.66, 9.81 ± 2.64, 9.61 ± 1.38, 9.59 ± 2.63, and 8.13 ± 1.89, respectively. A significant difference was found among the groups in the ΔE values (P = 0.006). The ΔE values were more than the perceptional threshold in all the groups (P < 0.0001). CONCLUSION: Within the limitations of this study, it can be concluded that the tested zirconia ceramic could not thoroughly mask different shades of the composite resin substrates. Moreover, color masking of zirconia depends on the shade of substrate.
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spelling pubmed-57130622017-12-13 Masking ability of a zirconia ceramic on composite resin substrate shades Tabatabaian, Farhad Shabani, Sima Namdari, Mahshid Sadeghpour, Koroush Dent Res J (Isfahan) Original Article BACKGROUND: Masking ability of a restorative material plays an important role to cover discolored tooth structure; however, this ability has not yet been well understood in zirconia-based restorations. This study assessed the masking ability of a zirconia ceramic on composite resin substrates with different shades. MATERIALS AND METHODS: Ten zirconia disc specimens, with 0.5 mm thickness and 10 mm diameter, were fabricated by a computer-aided design/computer-aided manufacturing system. A white substrate (control) and six composite resin substrates with different shades including A1, A2, A3, B2, C2, and D3 were prepared. The substrates had a cylindrical shape with 10 mm diameter and height. The specimens were placed onto the substrates for spectrophotometric evaluation. A spectrophotometer measured the L*, a*, and b* values for the specimens. ΔE values were calculated to determine the color differences between the groups and the control and then were compared with a perceptional threshold (ΔE = 2.6). Repeated measures ANOVA and Bonferroni tests were used for data analysis (P < 0.05). RESULTS: The mean and standard deviation of ΔE values for A1, A2, A3, B2, C2, and D3 groups were 6.78 ± 1.59, 8.13 ± 1.66, 9.81 ± 2.64, 9.61 ± 1.38, 9.59 ± 2.63, and 8.13 ± 1.89, respectively. A significant difference was found among the groups in the ΔE values (P = 0.006). The ΔE values were more than the perceptional threshold in all the groups (P < 0.0001). CONCLUSION: Within the limitations of this study, it can be concluded that the tested zirconia ceramic could not thoroughly mask different shades of the composite resin substrates. Moreover, color masking of zirconia depends on the shade of substrate. Medknow Publications & Media Pvt Ltd 2017 /pmc/articles/PMC5713062/ /pubmed/29238377 Text en Copyright: © 2017 Dental Research Journal http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.
spellingShingle Original Article
Tabatabaian, Farhad
Shabani, Sima
Namdari, Mahshid
Sadeghpour, Koroush
Masking ability of a zirconia ceramic on composite resin substrate shades
title Masking ability of a zirconia ceramic on composite resin substrate shades
title_full Masking ability of a zirconia ceramic on composite resin substrate shades
title_fullStr Masking ability of a zirconia ceramic on composite resin substrate shades
title_full_unstemmed Masking ability of a zirconia ceramic on composite resin substrate shades
title_short Masking ability of a zirconia ceramic on composite resin substrate shades
title_sort masking ability of a zirconia ceramic on composite resin substrate shades
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713062/
https://www.ncbi.nlm.nih.gov/pubmed/29238377
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