Variations in the Shades of Contemporary Dental Ceramics: An In Vitro Analysis (original) (raw)
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Color compatibility between dental structures and three different types of ceramic systems
BMC Oral Health
Background To assess color compatibility between dental structures (human enamel and dentine) and three different types of ceramic systems. Methods Samples (1 and 2 mm-thick) of extracted tooth (containing dentine and enamel areas) and three ceramic systems with different shades and opacities (HT–High Translucent, T–Translucent) were prepared for this study: Vita Suprinity—VS (HT, T; A1, A2, A3, A3.5, B2, C2, D2) (Vita Zahnfabrik); Vita Enamic—VE (HT, T; 1M1, 1M2, 2M2, 3M2) (Vita Zahnfabrik) and Noritake Super Porcelain EX-3—NKT (A1, A2, A3, A3.5, B2, C2, D2) (Kuraray Noritake Dental). Reflectance measurements of all samples were performed over black backgrounds using a non-contact spectroradiometer (SpectraScan PR-670, Photo Research) under a CIE 45°/0° geometry. CIE L*a*b* color parameters were measured and CIELAB/CIEDE2000 color differences (ΔE00/ΔE*ab) and corresponding Coverage Error (CE) of ceramic system for dentine or enamel samples were calculated. Color data was analyzed u...
Color Variation Between Matched and Fabricated Shades of Different Ceramics
Journal of Prosthodontics, 2013
Purpose: The aim of this study was to evaluate and compare the total color difference ( E) between natural teeth and fabricated crowns from three ceramic systems with different thicknesses. Materials and Methods: The color of ninety maxillary central incisors was measured from the middle third of the labial surface with a Vita Easyshade spectrophotometer. All-ceramic crown preparations with different thicknesses (0.8, 1.2, 1.5 mm) were done on selected teeth (n = 30). Prepared teeth were randomly divided into three equal groups to fabricate ceramic crowns from three ceramic systems, Duceram LFC (DLFC), In-Ceram SPINELL (ICS), and IPS Empress (IPSE). Colors of cemented crowns were measured and compared with their corresponding measurements before preparations. Data were statistically analyzed using two-way ANOVA at 5% significance level. Results: A significant difference of E was detected between natural teeth and different thicknesses of crowns constructed from the all-ceramic materials investigated. Comparing the three materials at 0.8 mm thickness revealed that the lowest E was recorded for DLFC, which was significantly different from the other ceramic systems while IPSE showed the highest E. At higher thicknesses there was no difference between natural tooth shade and crowns constructed from different ceramic materials. Conclusions: Reinforcement of ceramics by alumina for In-Ceram and leucite for Empress decreases color production. Level of acceptance between the different ceramic materials and thicknesses varied. DLFC showed the highest color matching at all thicknesses followed by ICS and IPSE in descending order. In general, increasing the thickness of fabricated crowns enhances color match.
Ceramic Materials and Color in Dentistry
2010
The aesthetics of a dental restoration depends on the chosen material, anatomical form, surface texture, translucency and color. This means that, to accurately reproduce the appearance of a natural tooth, considering the patterns of reflection and absorption of the light is not an easy task (Knispel, 1991; Chu et al., 2004). Ceramics have been widely used in dentistry because of their ability to provide excellent cosmetic results that mimic natural teeth. They are biocompatible, allow adequate reflection and transmission of light, and they exhibit good mechanical strength when subjected to masticatory efforts (Holloway & Miller, 1997). The rapid development of ceramic systems and processing enabled the treatment of teeth in both the anterior and posterior areas, with the primary objectives of properly restoring form, function and aesthetic excellence without the presence of metal.
Open Access Macedonian Journal of Medical Sciences
BACKGROUND: The color of all ceramic restorations has a significant effect on the final appearance of the restoration. AIM: This study aimed to evaluate the effect of different shading techniques on the color stability of monolithic zirconia crowns cemented on the upper anterior teeth. METHODS: In this study, there were nine patients. Each patient has undergone a reduction for the upper six anterior teeth. Fifty-four zirconia jacket crowns were constructed using CAD/CAM technique. According to the shading technique, the crowns were categorized into two groups (pre-shaded and liquid shaded), where the upper right reduced teeth received pre-shaded zirconia crowns while the upper left reduced teeth received liquid-shaded zirconia crowns according to the selected shade. The color was assessed using easy shade after cementation and 1 year follow-up period. Data were collected, tabulated, and statistically analyzed. RESULTS: Color change (ΔE) of the cemented pre-shaded zirconia crowns on ...
Color matching of full ceramic versus metal-ceramic crowns - a spectrophotometric study
Medicine and Pharmacy Reports, 2019
Background and aims. To verify the color match of metal-ceramic and full ceramic crowns, using instrumental methods. Methods. A number of 153 teeth (anterior and posterior teeth), in 62 patients, were restored with metal ceramic (MC, n=119), pressed-ceramic (PC, n=28), and zirconia-ceramic (ZC, n=6) full coverage crowns. The shade of a reference natural tooth was recorded instrumentally with a dental spectrophotometer (Vitaeasyshade Advance 4.0) in “single tooth measurement”, which provided the base color in Vita Classic (VC) and Vita 3D Master shades (3D). For verifying the outcome of the restoration “verify restoration” mode was used, and ΔE values were recorded for both VC and 3D Master shade guides. Moreover, matching symbols were also recorded (***=good, **=fair, *=poor). Descriptive statistics was performed and data were analyzed (One-sample z-Test, α=0.05) for comparison with visual thresholds in dentistry (Perceptibility Threshold – PT=1.2 and Acceptability Threshold – AT...
Journal of Contemporary Dentistry, 2012
ABSTRACTAimTo evaluate and compare the shade of zirconia and alumina crowns over composite, all-ceramic and metal core material.Objectives(1) To evaluate the influence of composite core build-up material on the shade of zirconia and alumina crowns. (2) To evaluate the influence of all-ceramic core material on the shade of zirconia and alumina crowns. (3) To evaluate the influence of metal core material on the shade of zirconia and alumina crowns. (4) To compare the influence of composite, all-ceramic and metal core material on the shade of zirconia and alumina crowns.Materials and MethodsThe all-ceramic materials used for fabrication of crowns were zirconia (LAVA) and alumina (PROCERA). They were evaluated spectrophotometrically for the change in shade when placed over three core build-up materials.ResultsThe observations obtained were statistically analyzed by analysis of variance. Zirconia crowns when compared with alumina crowns showed the least shade change when placed on the th...
Color related to ceramic and zirconia restorations: A review
Dental Materials, 2011
The requirement to achieve natural looking restorations is one of the most challenging aspects of dentistry, and the shade matching of dental restorations with the natural dentition is a difficult task due to the complex optical characteristics of natural teeth. Dental porcelain is considered the reference material for prosthetic rehabilitation, but it is not easy to handle and aesthetic excellence is quite difficult to obtain. For these reasons, shade matching with dental porcelain is often considered to be more artistic than scientific. Shade matching is considered unpredictable due to several variables that may influence the final appearance of a restoration. In order to improve this situation, over the last decade new shade guides and instruments have been developed and the aesthetic aspects of dental porcelain have been further investigated. In this review some aspects of color selection and color reproduction have been examined. Color selection has advanced through the development of new shade guides and electronic shade taking devices, although visual assessment has still not been entirely replaced by electronic instruments. Color reproduction with dental porcelain has improved thanks to advances in the performance and knowledge of dental porcelain, but is still not easy to achieve. The difficulties of achieving good aesthetics with PFM restorations and the desire for metal free solutions have resulted in the increased use of zirconia. The unique optical properties of zirconia have introduced new opportunities for achieving superior aesthetics, however further research is required with this material.
Impact Of Simulated Gastric Acid On Color Stability Of Different Types Of Dental Ceramics
Egyptian Dental Journal
Purpose: The purpose of this in vitro study was to evaluate the impact of simulated gastric acidity on color stability of different types of dental ceramics. Materials and Methods: Fifty specimens were constructed according to type of the material into five groups (n=10), as follows: Partially stabilized zirconia (PSZ) (Prettaue), Fully stabilized zirconia (FSZ) (Prettaue Anterior), lithium disilicate ceramics (IPS. Emax), Zirconia-containing lithium silicate ceramics (ZLS) (Vita Suprinity) and Hybrid ceramics (Vita Enamic). All specimens were cut with a low-speed diamond saw (Isomet) into a rectangular shape with the following dimension: 12mm width x 14mm length x 1 mm thickness. Color stability was evaluated by reflective spectrophotometer. Each specimen was immersed in 5 ml of the simulated acid of ph 1.2 for 96 h in a 37˚C incubator. One-way ANOVA was used to compare mean difference between groups. Results: There was highly significant difference (P=0.000) between all groups. Prettaue group showed the least amount of color change (2.97±1.27), while vita enamic group showed the highest color change (5.97±3.29). Conclusions: The gastric acid changed the color of all types of dental ceramics. Except for Partially stabilized zirconia and lithium disilicate ceramics, the color change of all other ceramics was noticeable to the human eye and then was clinically unacceptable..