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KMID : 1023820190110050286
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The Journal of Advanced Prosthodontics
2019 Volume.11 No. 5 p.286 ~ p.296
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Choice of resin cement shades for a high-translucency zirconia product to mask dark, discolored or metal substrates
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Dai Shiqi
Chen Chen
Tang Mo
Chen Ying
Yang Lu
He Feng
Chen Bingzhuo
Xie Haifeng
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Abstract
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PURPOSE: The aim was to study the masking ability of high-translucency monolithic zirconia and provide guidance in selecting resin luting cements in order to mask discolored substrates.
MATERIALS AND METHODS: 160 high-translucency zirconia specimens were divided into 32 groups depending on their thickness and shades. Using five shades of try-in paste, the specimens were luted onto the sub strates (Co-Cr, precious-metal, opaque porcelain-sintered Co-Cr, opaque porcelain-sintered precious-metal, and 5M3-shade zirconia). All CIELAB color parameters were measured and statistically analyzed.
RESULTS: Zirconia shade and thickness and try-in paste shade affected CIELAB color parameters (P=.000) in different substrates groups, and there were interactions among these factors (P=.000). All five try-in paste shades can be chosen to achieve ΔE values of zirconia with 1.2 ? 1.5 mm for masking dark-tooth-like 5M3-shade and zirconia with 1.5 mm for masking precious-metal groups < 2.6. Only suitable try-in paste shades were used, can ΔE values that less than 2.6 be achieved when applied translucent monolithic zirconia with 0.7?1.0 mm for masking dark-tooth-like 5M3-shade and zirconia with 0.7 ? 1.2 mm for masking precious-metal groups.
CONCLUSION: Choosing suitable resin cement shades is necessary for high-translucency monolithic zirconia to achieve ideal masking ability (ΔE < 2.6) on the dark-tooth.
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KEYWORD
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Resin cement, Color, Zirconia, Post-core, Spectrophotometry
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