Contrast ratios and masking ability of three types of ceramic veneers

Chu, Frederick C.S.; Chow, Tak W; Chai, John

doi:10.1016/s0022-3913(07)60120-6

Cited by 115 publications

(139 citation statements)

References 14 publications

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“…In addition, a positive linear relationship between opacity and ability of veneers to mask backgrounds was confirmed, which is in agreement with the results found in previous studies. 25,38 DE values for NRPA specimens were considerably higher than for IPSe and VM7 specimens. Moreover, CR percentages calculated for NRPA were lower than those obtained for IPSe and VM7.…”

Section: 33mentioning

confidence: 70%

“…The values of the hue (x), chroma (y), and luminous intensity (Y) can be obtained from spectrophotometric measurements as well as colorimetric measurements. [23][24][25] Chu and others 25 compared the masking ability and CRs of 0.7-mm-thick ceramic veneers and found that Vitadur Alpha had the lowest CR and poorest masking ability as compared with Procera and Empress II. In addition, they concluded that the use of both Procera and Empress II as veneering materials may be limited when heavily discolored teeth are involved because they were not fully capable of masking a black background.…”

Section: Introductionmentioning

confidence: 99%

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Contrast Ratio and Masking Ability of Three Ceramic Veneering Materials

Shono¹,

Nahedh²

2012

Operative Dentistry

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Masking severely discolored dentitions is one of the indications for the use of ceramic veneers. IPS e.max Press and Vita VM7 had significantly higher contrast ratios and masking abilities than Nobel Rondo Press Alumina: Solo. However, none of the materials tested was able to completely mask the black background. SUMMARYStatement of the Problem: Porcelain veneer materials are translucent and are therefore affected by their thickness as well as the color of the underlying substructure, which limits their masking ability and compromises the esthetic result in heavily stained teeth.Purpose: The purpose of this study was to compare the contrast ratio (CR) and masking ability of three different veneering ceramics with two thicknesses by measuring the color differences over white and black backgrounds. Correlations between CR and masking ability of these veneering ceramics were evaluated.Methods and Materials: A total of 30 discshaped specimens (12 mm diameter 3 1.0 mm or 1.5 mm) were fabricated in shade A2 from three types of all-ceramic systems: IPS e.max Press (IPSe; Ivoclar Vivadent, Schaan, Liechtensein), Vita VM7 (VM7; VITA Zahnfabrik, Bad Sä ckingen, Germany), and Nobel Rondo Press Alumina: Solo (NRPA; Nobel Biocare, Zü richFlughafen, Switzerland). The CR, defined as the ratio of illuminance (Y) of the test material when placed on the black background (Yb) to the illuminance of the same material when placed over a white background (Yw), was determined (CR=Yb/Yw). The color (CIE L*a*b*) and Y of each specimen were measured over standard white and black tiles using a spectrophotometer (ColorEye 7000 A, Model C6, GretagMacbeth, New Windsor, NY, USA). Masking abilities of the specimens were determined by measuring the color difference (DE) over white and black backgrounds. Both CR and DE data were analyzed using two-way analysis of variance (ANOVA). One-way AN-OVA was used to compare the mean values of CR across the three materials followed by the Duncan multiple comparison test. The Results: CR values of NRPA were significantly less than those of IPSe and VM7, and the CR of IPSe was higher than that of VM7. Furthermore, CR increased as the thickness of the discs increased to 1.5 mm for all three materials. Mean DE values were significantly higher with 1.0-mm-thick discs than with 1.5-mm discs. Among the three materials it was observed that NRPA had the highest DE when compared with IPSe or VM7, whereas the DE of the latter two were not significantly different from one another. There was a strong linear correlation between CR and masking ability.Conclusion: CR and masking ability are affected by the type as well as the thickness of the ceramic used. IPSe and VM7 are similar in their masking abilities, whereas NRPA had the lowest masking ability. NRPA was the most translucent, followed by VM7; IPSe was the most opaque. None of the materials tested was able to completely mask the black background. It is therefore recommended that the type of ceramic should be chosen according to each clinical situation.

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Section: 33mentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Contrast Ratio and Masking Ability of Three Ceramic Veneering Materials

Shono¹,

Nahedh²

2012

Operative Dentistry

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“…In fact, lightness is considered one of the most important optical properties, since the human eye is more sensitive to this property than to hue or chroma. In addition, the effect of the material fluorescence on the optical properties of the final restoration has not yet been determined for a number of clinical conditions 25,26) . Therefore, the aim of the present study was to evaluate the impact of the tooth substrate shade on the color differences, transmittance, and fluorescence of CAD/CAM leucite based ceramics (LBC).…”

Section: Introductionmentioning

confidence: 99%

Impact of background on color, transmittance, and fluorescence of leucite based ceramics

Rafael

Güth

Kauling

et al. 2017

Dental Materials Journal

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This study evaluated the impact of tooth shade on differences in color (∆E), lightness (∆L), chromaticity coordinates a*/b* (∆a and ∆b), transmittance and the degree of fluorescence of CAD/CAM leucite based ceramic (LBC). Ten disks were fabricated of LBC; Empress CAD, A2, thickness of 1.5 mm and eight disks of resin-nano-ceramic (RNC; Lava Ultimate) in different colors to simulate variations in substrate shade. The associations of LBC disks with different color substrates were analyzed with a spectrophotometer; ∆E, ∆L*, ∆a*, ∆b*, and transmittance were measured and calculated. Fluorescence was evaluated with a fluorescence system (Fluorescence System, Biopdi). All substrate shades influenced the optical properties of LBC, with regard to color, luminosity, coordinate a* and b*, transmittance, and fluorescence (p<0.001). Substrate colors with high saturation (A3.5 and C2) presented highest impact, whereas colors with lowest saturations (BL, B1) showed less impact. Substrate color influenced the optical properties of ceramic restorations.

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“…According to other reports that observe the translucency of the core, the translucency declines from heat-pressed glass ceramic to alumina and to zirconia and the masking ability is superior 10) . Recently, a computer-assisted design/computerassisted manufacturing produced, Y-TZP?based systems are in considerable demand in esthetic and stress-bearing regions.…”

Section: Case Reportmentioning

confidence: 90%

Restoration of Rotated and Discolored Maxillary Incisors with a Zirconia All-Ceramic System: A Case Report

Baek¹,

Lim

Kim³

et al. 2013

Journal of Dental Rehabilitation and Applied Science

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Recently, the demand for esthetic improvement by a treatment neither time consuming nor invasive is increasing. The patient wanted the maxillary anterior teeth appearance to be improved by prosthetic treatment, not other treatments such as orthodontic, periodontal, and endodontic treatments, despite the limit of esthetic improvement. In this case, among the recent variety of all ceramic systems for the aesthetic prosthetic restoration, we selected the zirconia-based system as a method of restoration in order to conceal the discoloration of teeth. The patient was satisfied with the esthetic results.

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Contrast ratios and masking ability of three types of ceramic veneers

Cited by 115 publications

References 14 publications

Contrast Ratio and Masking Ability of Three Ceramic Veneering Materials

Contrast Ratio and Masking Ability of Three Ceramic Veneering Materials

Impact of background on color, transmittance, and fluorescence of leucite based ceramics

Restoration of Rotated and Discolored Maxillary Incisors with a Zirconia All-Ceramic System: A Case Report

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