Color Variation Between Matched and Fabricated Shades of Different Ceramics

Ghulman, Motaz; Awad, Mohamed Abdelmageed

doi:10.1111/jopr.12027

Cited by 8 publications

(16 citation statements)

References 39 publications

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“…Spectrophotometers are commonly applied for color measurement . Many studies have estimated the color reproduction ability of different ceramics . Translucency is another important property for a ceramic .…”

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confidence: 99%

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Tabatabaian

2018

Journal of Prosthodontics

137

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Monolithic zirconia restoration is an acceptable treatment option in restorative dentistry and a developing trend in esthetic dentistry. Digital dentistry has simplified fabrication of monolithic zirconia restorations. Zirconia ceramic has introduced an opportunity to achieve both esthetic and mechanical requirements for restorations. This is rarely found for a ceramic in dentistry. Monolithic zirconia restorations represent an acceptable durability, comparable to metal-ceramic restorations, while they are superior to metal-ceramic restorations esthetically; however, difficulties to gain an optimal shade reproduction and a color match with monolithic zirconia restorations still remain. The color of these restorations may be influenced by manufacturing processes, laboratory procedures, and clinical factors. Manufacturing processes determine basic optical properties of zirconia ceramics. Different laboratory procedures may create optical changes in zirconia ceramics. Also clinical factors such as dental background, cement, and zirconia restoration features may affect the resulting color. This literature review aimed to discuss potent factors in the color of monolithic zirconia restorations. An electronic search of the PubMed/Google Scholar database was performed to find related English-language articles published between January 1, 2000, and October 31, 2017. The key terms of background, cement, ceramic, color, esthetics, shade, spectrophotometry, thickness, translucency, and zirconia were used both individually and simultaneously. Also, a manual search was conducted, and five classic articles of color science were added. Thus 192 articles were included. In the last decade, shade reproduction of monolithic zirconia restorations has been highly regarded; however, further improvements are required in the manufacturing process to produce tooth-like zirconia ceramics. An esthetic guideline named background-cement-ceramic color harmony was suggested in this study; however, more clinical practice guidelines should be established for monolithic zirconia restorations on esthetics, and therefore, more studies are required.

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confidence: 99%

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Tabatabaian

2018

Journal of Prosthodontics

137

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“…The final all ceramic restoration that have appropriate match with the corresponding shade guide is a multifactorial issue [10][11][12][13] . These factors include the type of ceramic material, steps of manufacturing (condensation technique, number of firing cycles and temperature, and ceramic thickness), and thickness of dentin remaining 14-22 . Optical interaction between light and tooth structure is responsible for its color.…”

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confidence: 99%

Shade Matching of CAD/CAM Lithium Silicate Ceramics Veneered on Newly Introduced Foundation Material.

Elhelbawy

2021

Egyptian Dental Journal

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Statement of the problem: The emergence of Polyetheretherketone (PEEK) in prosthodontics and its use as a foundation for ceramic veenering restorations demand reassessment of shade match of final restoration. Purpose: This study aimed to investigate the use of different foundation materials on the color output of two CAD/CAM lithium silicate ceramics. Material and Methods: Rectangular plate specimens (60 samples) were prepared from CAD/ CAM generated all-ceramic materials of shade A2; IPS e.max (EM) CAD and Vita suprinity blocks (ZLS). A reflectance spectrophotometer used to measure the colour difference of ceramic samples before and after bonding to different foundation specimens; Zirconia (ZR), resin composite (RC), and PEEK; all of shade A2. The parameter of colour was measured via CIE L*a*b* (Commission Internationale de L'Eclairage) color system. Statistical analysis of data were done using two way ANOVA and the Tukey HSD test (α=0.05). Results: ANOVA revealed that ΔE values influenced significantly (P<.05) by the composition of ceramic material and different foundation materials used. However; the interaction was almost not statistically significant between the variables (p=.294). In comparison to ZR and RC assemblies, the foundation material; PEEK, revealed comparable color parameters when assembled with each of the tested veneering material. Conclusions: Zirconia reinforcement of CAD / CAM lithium silicate glass-ceramics decrease the impact of color variations on the various foundation materials used. The level of color acceptance varies between the ceramic and foundation materials tested. Compared to other widely used foundation materials (ZR and RC); PEEK displayed no different tendencies in color properties.

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“…In the CIE LAB system, L* represents the lightness of a color in the black‐white axis, a* defines color on the green‐red axis, and b* defines color along the blue‐yellow axis. As stated before, the CIE L* a* b* color system is commonly used in perceptual color assessment because of its approximate visually uniform coverage of the color space . In this color space, color difference (∆E) between two objects (L* 1 , a* 1 , b* 1 and L* 2 , a* 2 , b* 2 ) can be calculated according to the following formula:

Δ E = bold-italic {([], {((), {bold-italicL}^{bold-italic *}_{1} - {bold-italicL}^{bold-italic *}_{2})}^{2} + {((), {bold-italica}^{bold-italic *}_{1} - {bold-italica}^{bold-italic *}_{2})}^{2} + {((), {bold-italicb}^{bold-italic *}_{1} - {bold-italicb}^{bold-italic *}_{2})}^{2})}^{1 / 2}

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confidence: 99%

“…Spectrophotometers measure and record the amount of visible radiant energy reflected by the teeth one wavelength at a time for each hue, value, and chroma present in the entire visible spectrum . They use reflectance technology because they only calculate the quantity and quality of light not absorbed by the measured tooth.…”

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confidence: 99%

“…Errors associated with shade reproduction have been documented in the literature, and include differences in ceramic alloys, thickness of substuctures, porcelain system brand, powder/liquid ratio, and subsequent porcelain firing . It has been reported that the shade of metal ceramic specimens is affected by the type of base metal alloy substructure and type of overlying porcelain system .…”

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confidence: 99%

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