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Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns

PURPOSE: The objective of this study was to determine the effect of the color of a background substructure on the overall color of a zirconia-based all-ceramic crown. MATERIALS AND METHODS: Twenty one posterior zirconia crowns were made for twenty subjects. Seven premolar crowns and six molar crowns...

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Detalles Bibliográficos
Autores principales: Suputtamongkol, Kallaya, Tulapornchai, Chantana, Mamani, Jatuphol, Kamchatphai, Wannaporn, Thongpun, Noparat
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Academy of Prosthodontics 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774947/
https://www.ncbi.nlm.nih.gov/pubmed/24049574
http://dx.doi.org/10.4047/jap.2013.5.3.319
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author Suputtamongkol, Kallaya
Tulapornchai, Chantana
Mamani, Jatuphol
Kamchatphai, Wannaporn
Thongpun, Noparat
author_facet Suputtamongkol, Kallaya
Tulapornchai, Chantana
Mamani, Jatuphol
Kamchatphai, Wannaporn
Thongpun, Noparat
author_sort Suputtamongkol, Kallaya
collection PubMed
description PURPOSE: The objective of this study was to determine the effect of the color of a background substructure on the overall color of a zirconia-based all-ceramic crown. MATERIALS AND METHODS: Twenty one posterior zirconia crowns were made for twenty subjects. Seven premolar crowns and six molar crowns were cemented onto abutments with metal post and core in the first and second group. In the third group, eight molar crowns were cemented onto abutments with a prefabricated post and composite core build-up. The color measurements of all-ceramic crowns were made before try-in, before and after cementation. A repeated measure ANOVA was used for a statistical analysis of a color change of all-ceramic crowns at α=.05. Twenty four zirconia specimens, with different core thicknesses (0.4-1 mm) were also prepared to obtain the contrast ratio of zirconia materials after veneering. RESULTS: L(*), a(*), and b(*) values of all-ceramic crowns cemented either on a metal cast post and core or on a prefabricated post did not show significant changes (P>.05). However, the slight color changes of zirconia crowns were detected and represented by ΔE(*)(ab) values, ranging from 1.2 to 3.1. The contrast ratios of zirconia specimens were 0.92-0.95 after veneering. CONCLUSION: No significant differences were observed between the L(*), a(*), and b(*) values of zirconia crowns cemented either on a metal cast post and core or a prefabricated post and composite core. However, the color of a background substructure could affect the overall color of posterior zirconia restorations with clinically recommended core thickness according to ΔE(*)(ab) values.
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spelling pubmed-37749472013-09-18 Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns Suputtamongkol, Kallaya Tulapornchai, Chantana Mamani, Jatuphol Kamchatphai, Wannaporn Thongpun, Noparat J Adv Prosthodont Original Article PURPOSE: The objective of this study was to determine the effect of the color of a background substructure on the overall color of a zirconia-based all-ceramic crown. MATERIALS AND METHODS: Twenty one posterior zirconia crowns were made for twenty subjects. Seven premolar crowns and six molar crowns were cemented onto abutments with metal post and core in the first and second group. In the third group, eight molar crowns were cemented onto abutments with a prefabricated post and composite core build-up. The color measurements of all-ceramic crowns were made before try-in, before and after cementation. A repeated measure ANOVA was used for a statistical analysis of a color change of all-ceramic crowns at α=.05. Twenty four zirconia specimens, with different core thicknesses (0.4-1 mm) were also prepared to obtain the contrast ratio of zirconia materials after veneering. RESULTS: L(*), a(*), and b(*) values of all-ceramic crowns cemented either on a metal cast post and core or on a prefabricated post did not show significant changes (P>.05). However, the slight color changes of zirconia crowns were detected and represented by ΔE(*)(ab) values, ranging from 1.2 to 3.1. The contrast ratios of zirconia specimens were 0.92-0.95 after veneering. CONCLUSION: No significant differences were observed between the L(*), a(*), and b(*) values of zirconia crowns cemented either on a metal cast post and core or a prefabricated post and composite core. However, the color of a background substructure could affect the overall color of posterior zirconia restorations with clinically recommended core thickness according to ΔE(*)(ab) values. The Korean Academy of Prosthodontics 2013-08 2013-08-31 /pmc/articles/PMC3774947/ /pubmed/24049574 http://dx.doi.org/10.4047/jap.2013.5.3.319 Text en © 2013 The Korean Academy of Prosthodontics http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Suputtamongkol, Kallaya
Tulapornchai, Chantana
Mamani, Jatuphol
Kamchatphai, Wannaporn
Thongpun, Noparat
Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns
title Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns
title_full Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns
title_fullStr Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns
title_full_unstemmed Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns
title_short Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns
title_sort effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774947/
https://www.ncbi.nlm.nih.gov/pubmed/24049574
http://dx.doi.org/10.4047/jap.2013.5.3.319
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