J Adv Prosthodont.  2016 Feb;8(1):37-42. 10.4047/jap.2016.8.1.37.

Effect of the amount of thickness reduction on color and translucency of dental monolithic zirconia ceramics

• Kim HK
• Kim SH
• Lee JB
• Han JS
• Yeo IS
• Ha SR

• KMID: 2393194
• DOI: http://doi.org/10.4047/jap.2016.8.1.37

Abstract

PURPOSE
This study investigated the effect of amount of thickness reduction on color and translucency of dental monolithic zirconia ceramics.
MATERIALS AND METHODS
One-hundred sixty-five monolithic zirconia specimens (16.3 mm x 16.3 mm x 2.0 mm) were divided into 5 groups (Group I to V) according to the number of A2-coloring liquid applications. Each group was then divided into 11 subgroups by reducing the thickness up to 1.0 mm in 0.1-mm increments (Subgroup 0 to 10, n=3). Colors and spectral distributions were measured according to CIELAB on a reflection spectrophotometer. All measurements were performed on five different areas of each specimen. Color difference (DeltaE*(ab)) and translucency parameter (TP) were calculated. Data were analyzed using one-way ANOVA and multiple comparison Scheffe test (alpha=.05).
RESULTS
There were significant differences in CIE L* between Subgroup 0 and other subgroups in all groups. CIE a* increased (0.523.7) were obtained between Subgroup 0 and other subgroups. TP values generally increased as the thickness reduction increased in all groups (R2>0.89, P<.001).
CONCLUSION
Increasing thickness reduction reduces lightness and increases a reddish, bluish appearance, and translucency of monolithic zirconia ceramics.

Keyword

Y-TZP ceramic; Color; Dental Prosthesis Coloring

MeSH Terms

Ceramics*
Prosthesis Coloring
Ceramics

Figure

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  Fig. 1 Means of CIE L* values of each group against a black background as a function of the amount of thickness reduction.

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  Fig. 2 Means of CIE a* values of each group against a black background as a function of the amount of thickness reduction.

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  Fig. 3 Means of CIE b* values of each group against a black background as a function of the amount of thickness reduction.

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  Fig. 4 Average spectral reflectance curve of each subgroup in Group I.

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  Fig. 5 Means of ΔE*ab units between Subgroup 0 and other subgroups for each group.

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  Fig. 6 Average spectral transmittance curve of each subgroup in Group I.

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