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KMID : 1023820160080010037
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The Journal of Advanced Prosthodontics
2016 Volume.8 No. 1 p.37 ~ p.42
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Effect of the amount of thickness reduction on color and translucency of dental monolithic zirconia ceramics
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Kim Hee-Kyung
Kim Sung-Hun
Lee Jai-Bong
Han Jung-Suk
Yeo In-Sung
Ha Seung-Ryong
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Abstract
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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 × 16.3 mm × 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 (ΔE*ab) and translucency parameter (TP) were calculated. Data were analyzed using one-way ANOVA and multiple comparison Scheffe test (α=.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.
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KEYWORD
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Y-TZP ceramic, Color, Dental Prosthesis Coloring
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