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Quantitative examination of factors influencing the colour reproduction ability of lithium disilicate glass-ceramics

Effects of ceramic translucency, layer thickness, and substrate colour on the shade of lithium disilicate glass-ceramic restorations proved to be significant in several studies, however, quantitative, numerical results on the relationship between the colour difference and these parameters are still...

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Published in:BMC oral health 2024-06, Vol.24 (1), p.660-11, Article 660
Main Authors: Saláta, József, Szabó, Ferenc, Csuti, Péter, Antal, Melinda, Márton, Péter, Hermann, Péter, Borbély, Judit, Ábrám, Emese
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description Effects of ceramic translucency, layer thickness, and substrate colour on the shade of lithium disilicate glass-ceramic restorations proved to be significant in several studies, however, quantitative, numerical results on the relationship between the colour difference and these parameters are still lacking. The purpose of this in vitro study was to quantitatively determine how the colour reproduction ability of a lithium disilicate glass-ceramic is affected by its translucency, layer thickness, and substrate colour. Ceramic samples were prepared from A2 shade IPS e.max CAD blocks with high and low translucencies (HT and LT) in a thickness range of 0.5-2.5 mm (+/- 0.05 mm). Layered samples were acquired utilizing composite substrates in 9 shades; transparent try-in paste was used. The spectral reflectance of the specimens was assessed under D65 standard illumination with a Konica Minolta CM-3720d spectrophotometer. The CIEDE2000 colour difference (ΔE ) between two samples was analysed using perceptibility and acceptability thresholds set at 50:50%. Statistical analysis involved linear regression analysis and the Kruskal-Wallis test. An increase in the thickness of 0.5 mm reduced the ΔE of the HT samples to 72.8%, and that of the T samples to 71.1% (p 
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An increase in the thickness of 0.5 mm reduced the ΔE of the HT samples to 72.8%, and that of the T samples to 71.1% (p &lt; 0.0001). 7 substrates with HT and LT specimens had significantly different results from the mean (p &lt; 0.05). A thickness of 0.5 mm is not sufficient to achieve an acceptable result at any level of translucency, while the low translucency ceramic at a thickness of 1.5 mm gave acceptable results, except for severely discoloured substrates (ND8 and ND9). 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subjects Analysis
CAD-CAM systems
Ceramic materials
Ceramics
Ceramics - chemistry
Cerium oxides
Color
Colour
Colour difference
Crystallization
Dental ceramic
Dental ceramics
Dental Porcelain - chemistry
Dentistry
Health aspects
Humans
Lithium
Lithium compounds
Lithium disilicate
Manufacturers
Materials
Materials Testing
Mechanical properties
Polymerization
Prosthesis Coloring
Reproduction
Shade
Silicones
Spectrophotometer
Spectrophotometry
Statistical analysis
Surface Properties
Translucency
title Quantitative examination of factors influencing the colour reproduction ability of lithium disilicate glass-ceramics
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