J Adv Prosthodont.  2013 Aug;5(3):319-325. 10.4047/jap.2013.5.3.319.

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

• Suputtamongkol K
• Tulapornchai C
• Mamani J
• Kamchatphai W
• Thongpun N

• KMID: 2118172
• DOI: http://doi.org/10.4047/jap.2013.5.3.319

Abstract

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 alpha=.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 DeltaE*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 DeltaE*ab values.

Keyword

Color; Dental Crown; Zirconia

MeSH Terms

Bicuspid
Cementation
Crowns
Molar
Zirconium
Zirconium

Figure

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  Fig. 1 The differences in L* between before try-in and before cementation (ΔL*1), and between before try-in and after cementation (ΔL*2) of molar crowns with metal cast post and cores, and molar crowns with prefabricated post and core build-up.

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  Fig. 2 The differences in a* between before try-in and before cementation (Δa*1), and between before try-in and after cementation (Δa*2) of molar crowns with metal cast post and cores, and molar crowns with prefabricated post and core build-up.

• 

  Fig. 3 The differences in b* between before try-in and before cementation (Δb*1), and between before try-in and after cementation (Δb*2) of molar crowns with metal cast post and cores, and molar crowns with prefabricated post and core build-up.

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