Assessment of Color Parameters of Composite Resin Shade Guides Using Digital Imaging versus Colorimeter

Yamanel, Kıvanç; Çağlar, Alper; Özcan, Mutlu; Gulsah, Kamran; Bağış, Bora

doi:10.1111/j.1708-8240.2010.00370.x

Cited by 41 publications

(46 citation statements)

References 20 publications

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“…This method has been used to assess ΔE with established accuracy. 20,21,24,33,37 While ΔE which corresponds to differences in color perception with specimens positioned on the same background is computed according to the formula:…”

Section: Discussionmentioning

confidence: 99%

“…This method has been used in various investigations to assess differences in color perception between teeth, 19 shade guides, 20,21 and observers. 22,23 Moreover, image analysis is applied in shade matching, [24][25][26] communication between dentists and laboratory technicians, 27,28 diagnosis of gingival inflammation, [29][30][31] oral lesions detection, 32 and evaluation of bleaching results.…”

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confidence: 99%

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Relative Translucency of a Multilayered Ultratranslucent Zirconia Material

Shamseddine¹,

Majzoub²

2017

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to compare the translucency parameter (TP) of ultratranslucent multilayered (UTML) zirconia according to thickness and layer level. Materials and methods:Rectangles of UTML zirconia with four layers [dentin layer (DEL), first transitional layer (FTL), second transitional layer (STL), and enamel layer (ENL)] and four different thicknesses (0.4, 0.6, 0.8, and 1 mm) were milled from blanks. Digital images were taken in a dark studio against white and black backgrounds under simulated daylight illumination and international commission on illumination (CIE) Lab* color values recorded using Photoshop Creative Cloud software. The TP was computed and compared according to thickness and layer level using analysis of variance (ANOVA) followed by Bonferroni post hoc analysis for multiple comparisons. Significance was set at p < 0.05. Results:In each thickness, TP values were similar between any two layers. The significant effect of thickness on the TP was observed only in the first two layers. In the DEL, translucency was significantly greater at 0.4 mm than all other thicknesses. In the FTL, differences were significant between 0.4 and 0.8 mm and between 0.4 and 1 mm. Conclusion:The investigated zirconia does not seem to show gradational changes in relative translucency from dentin to enamel levels regardless of the thickness used. Thickness affected the TP only in the first two layers with better translucency at 0.4 mm.Clinical significance: Since relative translucency does not seem to be significantly different between layers, clinicians can modify the apicocoronal positioning of the UTML layers within the restoration according to the desired Chroma without any implications on the clinically perceived translucency. While the thickness of 0.4 mm may be suggested for anterior esthetic veneers because of its higher translucency, the other thicknesses of 0.6 to 1 mm can be used to mask colored abutments in full contour restorations.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Relative Translucency of a Multilayered Ultratranslucent Zirconia Material

Shamseddine¹,

Majzoub²

2017

The Journal of Contemporary Dental Practice

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“…While subjective and qualitative methods, i.e., shade guides and photographic methods lead to unpredictable results, electronic intraoral devices such as colorimeters and spectrophometers can objectively detect color differences. 18,[34][35][36] These high-precision devices can metrically deliver consistent results using the CIE (Commision International de l'Eclairage [illumination]) L* a*b* system. 37,38 In the widely-recognized CIE L*a*b* color system, the location of the particular shade in the color space is defined by 3 coordinates, L*a*b*, where L*describes a color due to the lightness of the object being assessed, a* values are the chromaticity coordinates in the red-green axis, and b* in the yellow-blue axis.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Akar

Pekkan

Çal

et al. 2014

The Journal of Prosthetic Dentistry

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STATEMENT OF PROBLEM Surface-finishing protocols have a mechanical impact on ceramic surfaces that could eventually affect surface topography and light scattering. An optimum protocol is needed to avoid damaging the optical properties of ceramics. PURPOSE The purpose of this study was to determine the effects of different surface-finishing protocols on the surface roughness, color change, and translucency of ceramic and metal ceramic restorations. MATERIAL AND METHODS Standardized disk-shaped specimens (1.5 × 10 mm, n=128) were fabricated from 3 different ceramic core materials (aluminum oxide [Al2O3]-AL, zirconium oxide [ZrO2]-ZR, lithium disilicate [Li2Si2O5]-LIT), veneered (V) with dentin ceramics (n=32 per group), and placed in the following groups: ALV, ZRV, and LITV. The metal ceramic group acted as the control (n=32). Four different surface-finishing methods were tested. Airborne-particle abrasion with 50 m Al2O3, polishing with adjustment kit, polishing with adjustment kit plus diamond polishing paste, and autoglazing (n=8 subgroup) were applied on the veneering ceramics. The specimens were analyzed with a profilometer for surface roughness, and color change and translucency were measured with a clinical spectrophotometer. Statistical analyses were performed with 1-way ANOVA and the Tukey honest significant difference tests (=.05). RESULTS Specimens treated with the airborne particle abrasion method showed significantly higher mean profilometer for surface roughness values in all groups (P<.05). The polishing with adjustment kit and autoglazing methods revealed statistically similar surface roughness values in all groups (P>.05). With the diamond polishing paste method, lower surface roughness values were achieved in the ZRV and metal ceramic groups acted as the control groups. Different surface-finishing methods affected the color change of the ceramic systems, except for ZRV. Surface-finishing protocols significantly affected the translucency values of the ALV, LITV, and metal ceramic groups (P<.05). CONCLUSIONS No single surface-finishing protocol can be recommended to obtain the smoothest surface and the least color change without affecting translucency for the ceramics tested. The airborne-particle abrasion protocol created rougher surfaces and decreased translucency, and color change in zirconia was not affected by the finishing protocols. Purpose. The purpose of this study was to determine the effects of different surface finishing protocols on the surface roughness, color change and translucency of all-ceramic and metalceramic restorations. Materials and methods.Standardized disc-shaped specimens (1.5 mm x 10 mm, N=128)were fabricated using three different all-ceramic core materials (Al 2 O 3 -AL, ZrO 2 -ZR, Li 2 Si 2 O 5 -LIT) materials and veneered (V) with dentin ceramics (n=32 per group) constituting the following groups: ALV, ZRV, LITV. Metal-ceramic group acted as the control (MC) (n=32). Four different surface finishing methods were tested: Air-borne particle abrasion (AB) with 5...

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“…ΔE = 0 ~ 2 is considered imperceptible, ΔE = 2 ~ 3 just perceptible, ΔE = 3 ~ 8 moderately perceptible, and ΔE > 8 markedly perceptible. 21 Therefore, the ΔE of Group 1L was markedly perceptible, and those of Groups 2L and 3L were moderately perceptible. These results are in accord with those of other studies on color measurements of resin composites.…”

Section: Discussionmentioning

confidence: 99%

“…These shade variations might be due to various factors such as the amount, size, and shape of the filler. 21 The filler content of Z350 and Supreme XT is 78.5% by weight, and the filler is composed of zirconia/silica of 0.6 -1.4 μm. However, Z350 has added silica nanoparticles of 20 nm, whereas Supreme XT has silica nanofiller of 5 -75 nm in addition to the zirconia/silica.…”

Section: Discussionmentioning

confidence: 99%

Effects of layering technique on the shade of resin overlays and the microhardness of dual cure resin cement

Chang

Hong

2014

Braz. oral res.

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The purpose of this study was to assess the color of layered resin overlays and to test the early microhardness of dual cure resin cement (DCRC) light cured through the layered resin overlays. Resin overlays of 1.5 mm thickness were fabricated with the A3 shade of Z350 (Group 1L), the A3B and A3E shades of Supreme XT (Group 2L), and the A3, E3, and T1 shades of Sinfony (Group 3L) using one, two, and three layers, respectively (n = 7). Each layer of the resin overlays was set in equal thickness. The color of the resin overlays was measured with a colorimeter and compared with an A3 shade resin denture tooth. DCRC was light cured through the resin overlays, and the early microhardness of the DCRC was measured. The ΔE value between the denture tooth and the resin overlays and the Vickers hardness number (VHN) of the DCRC were analyzed with one-way ANOVA and Tukey's HSD test. The color differences were 8.9 ± 0.5, 5.3 ± 1.0, and 7.3 ± 0.5 and the VHNs were 19.4 ± 1.1, 21.1 ± 0.9, and 29.3 ± 0.6 for Groups 1L, 2L, and 3L, respectively. Therefore, to match the designated tooth color of resin inlays and to increase the early microhardness of DCRC, layered resin inlays are more appropriate than single-dentin-layer resin inlays. However, the translucent layer should be used cautiously because the color difference of resin inlays with a translucent layer was affected more than those without a translucent layer.

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Assessment of Color Parameters of Composite Resin Shade Guides Using Digital Imaging versus Colorimeter

Cited by 41 publications

References 20 publications

Relative Translucency of a Multilayered Ultratranslucent Zirconia Material

Relative Translucency of a Multilayered Ultratranslucent Zirconia Material

Effects of surface-finishing protocols on the roughness, color change, and translucency of different ceramic systems

Effects of layering technique on the shade of resin overlays and the microhardness of dual cure resin cement

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