Spectrophotometric analysis of color differences between porcelain systems

Seghi, Robert R.; Johnston, William M.; O’Brien, William J.

doi:10.1016/0022-3913(86)90279-9

Cited by 218 publications

(136 citation statements)

References 7 publications

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“…Table 3 and Figures 1 and 2 show the results of ΔE from the two tested groups. Table 3 shows that the results from the aging treatments and polishing did not differ from each other with the combination of TPH3 and Whiteness HP, while the coloring and bleaching treatments, although not differing, presented significant differences compared with previous treatments when classified using the criteria presented by Seghi et al (16) and adapted by Reis et al (17) for analysis of color change. Analyzing the parameters of color using the L* a* b* coordinates, there was a decrease in brightness of TPH3 when aged and stained, the same increase when cleared and polished ( Fig.…”

Section: Stability Analysis Of Colormentioning

confidence: 90%

“…The total variation in color was calculated using the following formula: The clinical significance for the stability of color was determined using the criteria presented by Seghi et al (16) and adapted by Reis et al (17) for analysis of color change. When the ΔE was higher than 3.7, it was considered an easily visible difference.…”

Section: Stability Analysis Of Colormentioning

confidence: 99%

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Changes in surface roughness and color stability of two composites caused by different bleaching agents

et al. 2012

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The objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.

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Section: Stability Analysis Of Colormentioning

confidence: 90%

Section: Stability Analysis Of Colormentioning

confidence: 99%

Changes in surface roughness and color stability of two composites caused by different bleaching agents

et al. 2012

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“…The appear ance of any restoration depends on outline form, surface form, translucency and colour. 1 Aesthetically superior restorations are now possible as a result of improvements in dental materi als and manufacturing techniques. However, one of the most challenging aspects of restorative dentistry is colour assess ment and its reproduction.…”

Section: Introductionmentioning

confidence: 99%

“…6 Moreover, visual assessment is often communicated to a labo ratory technician through the use of inadequate shade guides 7,8 and shade guides by the manufacturer may differ slightly. 1,7,8 Instruments such as spectrophotometers and colorimeters have been used in industrial and research settings for the evaluation and specifications of colour. Spectrophotometers measure the reflectance or transmittance factors of an object one wavelength at a time.…”

Section: Introductionmentioning

confidence: 99%

“…They have been used to measure the spectral curves of porcelains and extracted teeth. 1,[9][10][11][12] However, widespread use of spectrophotometers in dental research and clinical settings has been hindered by the fact that the equip ment is complex and expensive and, more importantly, that it is difficult to measure the colour of teeth in vivo with these machines. Since the end of the 1990s, an increasing number of computer-based instruments for shade selection have entered the market (Table 1).…”

Section: Introductionmentioning

confidence: 99%

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A clinical evaluation of the individual repeatability of three commercially available colour measuring devices

et al. 2007

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Effect of previsualization technique on different types of veneering porcelain

Saleh

El-Etreby

Morsi

2021

Color Research & Application

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Matching a porcelain restoration is a difficult task for both the dentist and the dental technician. In order to improve communication, it was suggested that a new previsualization technique with a new modeling liquid could be introduced. This study investigates the effect of this modeling liquid on color, translucency, and biaxial flexure strength on different types of veneering porcelain. A total of 42 samples were tested for IPS e.max veneered discs, feldspathic discs and the porcelain fused to metal discs. Twenty‐one were prepared with the manufacture liquid, while the other 21 were prepared with Visual‐Eyes modeling liquid. The porcelain powder was prepared for the Visual‐Eyes liquid by removing the food dyes with a specific firing cycle recommended by the manufacture. The porcelain mixes were layered using standardized Teflon molds of different thicknesses. The color and translucency and the biaxial flexure strength were tested. The results revealed statistical significance in the translucency between the liquids in all types of veneering porcelain. The manufacturer's liquid showed higher translucency than Visual‐Eyes liquid; however, the color difference and the biaxial flexure strength were similar between the two liquids. The use of the Visual‐Eyes liquid is indicated in specific cases of complicated build‐ups. This study has targeted a material that has never been investigated before. The material was invented several years ago and updated to the new liquid, but its effect on porcelain is still unknown.

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Spectrophotometric analysis of color differences between porcelain systems

Cited by 218 publications

References 7 publications

Changes in surface roughness and color stability of two composites caused by different bleaching agents

Changes in surface roughness and color stability of two composites caused by different bleaching agents

A clinical evaluation of the individual repeatability of three commercially available colour measuring devices

Effect of previsualization technique on different types of veneering porcelain

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