Effects of fabrication and shading technique on the color and translucency of new-generation translucent zirconia after coffee thermocycling (original) (raw)
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BioMed Research International
Purpose. The purpose of this study was to evaluate the effect of veneering and aging on the translucency of newly introduced extra and high translucent zirconia with different thickness. Materials and Methods. One hundred forty disk-shaped specimens were fabricated from two translucent zirconia blocks (VITA YZ XT and VITA YZ HT), and they are milled with CAD/CAM system. Then, specimens were divided into nonveneered (XT, HT) and veneered groups (XTV, HTV). Nonveneered groups were prepared with four different thicknesses (0.5-1-1.5-2 mm). Veneered groups were divided into three subgroups ( n = 10 ) for veneering with base dentin ceramic with thicknesses of 0.5 + 0.5 , 0.5 + 1 , and 0.5 + 1.5 mm . A spectrophotometer was used to calculate the translucency parameter (TP) and contrast ratio (CR) of all specimens before and after aging. Statistical analysis was performed using 3-way ANOVA and Tukey HSD tests ( p < 0.05 ). Results. TP values were significantly affected by thickness of...
Objective: This study aimed to assess the impact of monolithic zirconia thickness on its color properties after different surface finishing and polishing procedures, and following aging in coffee solution. Materials and methods: Two types of monolithic zirconia brands [Prettau Anterior (PA) and DD Cubex2 (DDC)] with three different thicknesses: 0.5, 1, and 1.5, and 10 mm diameter were tested. The color properties were evaluated after various surface finishing procedures (glazing, adjusting with burs + glaze, polishing, adjusting with burs + polishing) and after 5,000 cycles in a coffee solution were evaluated. The differences in color (ΔE) and translucency, were calculated and statistically analyzed by three-way ANOVA and pairwise comparison (α = 0.05). Results: The brand, material thickness, and surface finishing protocol before and after coffee thermocycling had significant effect on color variations (p < 0.001). For trans-lucency, 3-way ANOVA revealed a significant interaction between the material thickness and surface finishing protocol following aging in coffee solution (p < 0.001), however no significant interaction was observed following the surface finishing protocols (p = 0.247). Conclusions: The optical properties of monolithic zirconia ceramics can be influenced by the material brand, material thickness and the procedure of surface finishing and polishing. Clinical significance: Clinicians should take into consideration the potential change of the color properties of monolithic zirconia restorations following both contouring and occlusal adjustment procedures and coffee intake. K E Y W O R D S color, monolithic zirconia, surface finish, translucency
Egyptian dental journal, 2021
Aim: to evaluate the influence of immersion time in coffee staining solution on the color coordinates of two Zirconia-containing indirect aesthetic materials. Material and methods: 20 Discs were used in the current study; samples have been divided into two groups in accordance with the material used (monolithic Zirconia restoration group [Zirconia] and indirect Zirconia silicate filled composite restoration group [Ceramage]. The samples were prepared and then immersed in coffee [staining solution]. Spectrophotometric analysis was made immediately after manufacturing of discs at (T0), at 7days (T1), 14 days (T2) and at 21days. Results: At T0-T1, T1-T2, T0-T2 and T0-T3, the mean ΔE of Zirconia showed statistically significantly lower value than Ceramage. At T2-T3; no statistically significant difference between mean ΔE of the two ceramic types was found (P-value = 0.155, Effect size = 0.235). Regardless of time; Zirconia showed a statistically significant lower mean ΔE than Ceramage ...
Effect of veneering techniques and subsequent aging on translucency of bilayered zirconia
Future Dental Journal, 2018
this study compared the translucency of zirconia specimens veneered with different veneering techniques, and compared the change in translucency after aging. Materials and methods: Fifty slice specimens (0.50 ± 0.01 mm thick) were fabricated of IPS e.maxZirCAD core material, and ZL1 IPS e.maxZirLiner (0.10-mm thick) was layered. The specimens were randomly divided into five groups (n = 10/group). Group Ι (traditional layering technique) was veneered (0.60 mm) by condensing and sintering IPS e.max Ceram low-fusing nano-fluorapatite veneering porcelain; Group ΙΙ (High translucency press on technique) was veneered (0.60 mm) by heat-pressing HT IPS e.maxZirPressfluorapatite glass-ceramic ingots; Group ΙΙΙ (Low translucency press on technique) was veneered (0.60 mm) by heat-pressing LT IPS e.maxZirPressfluorapatite glass-ceramic ingots; Group ΙѴ (High translucency CAD-ON technique) was veneered (0.60 mm) by HT IPS e.max CAD lithium disilicate glass ceramic blocks and GroupѴ (Low translucency CAD-ON technique) was veneered (0.60 mm) by LT IPS e.max CAD lithium disilicate glass ceramic blocks. CIE (L * , a * , b *) parameters were measured and translucency was calculated for each veneering technique before and after aging according to the following equation: TP = [(L * B-L * W) 2 + (a * B-a * W) 2 + (b * B-b * W) 2 ] 1/2. One-way analysis of variance (ANOVA) combined with Bonferroni's post-hoc test and Paired t-test were used to analyze the data (α = 0.05). Results: Statistical analysis utilizing One-way ANOVA showed that, pressing technique had higher translucency than build-up and CAD on techniques. There was a significant difference between the three techniques except for the low translucency Pressing and CAD on techniques when compared with the build up after aging. Using Paired-t test to determine the effect of aging, a significant decrease of translucency was found in all techniques after aging except for the low translucency Pressing and CAD on techniques. Conclusion: Veneering zirconia with both layering and pressing techniques produced more translucent samples than with CAD-ON veneering technique. Aging caused a decrease in translucency of all samples.
Evaluation of color stability of preshaded and liquid-shaded monolithic zirconia
Journal of Prosthetic Dentistry, 2018
Anatomic contour (monolithic) zirconia restorations have become popular in recent years because of their high flexural strength, conservative tooth preparation, minimal wear on opposing teeth, reduced clinical and laboratory time of fabrication, and absence of veneering porcelain. 1-3 The manufacturers of monolithic zirconia crowns suggest the use of these restorations for patients with damaged occlusal surfaces, parafunctional habits, or a history of restoration fractures. In many patients, and especially in molar areas, the material provides adequate esthetics, but in anterior teeth, where the achievement of a natural appearance is the primary goal, monolithic zirconia compromises esthetics 3,4 by giving a rather opaque appearance and an unpredictable and as yet unexplored color stability during clinical function. To achieve esthetics comparable with those of veneering porcelain, 2 main approaches to coloring monolithic zirconia have been proposed. 5-8 Either metallic pigments are added to the initial zirconia powder before or after pressing the milling blocks, 8,9 or anatomic contour zirconia restorations are immersed in coloring liquids containing chloride solutions of rare earth elements to produce cores of various shades. 6,7,10-12
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 ...
Three generations of zirconia: From veneered to monolithic. Part II
2017
This article presents the historical development of the different generations of zirconia and their range of indications, from veneered to monolithic zirconia restorations. While Part I concentrated on detailed information about the development of zirconia for dental use and the mechanical and optical properties, Part II deals with the resulting guidelines for working with the relevant generations by summarizing the correct cementation procedure. Furthermore, this part also focuses on translucency measurements for better characterization and understanding of the different materials. The results obtained from measuring light transmission and contrast ratio are compared and discussed in detail, with the aid of clinical photographs. Finally, the reader is given practice-relevant recommendations for different areas of clinical use of the zirconia generations along with advice on how to process them appropriately.
The Journal of Prosthetic Dentistry, 2019
Using a ceramic instead of a metal core allows more light transmission within a crown and therefore creates restorations with improved color and translucency. 1 Layering a strong ceramic core, such as yttriastabilized tetragonal zirconia (Y-TZP) with a highly esthetic veneering porcelain, can provide a restoration with excellent esthetics. 2 The excellent mechanical properties of Y-TZP is derived from the transformation toughening mechanism. 3 Matching the color of ceramic restorations to natural teeth is influenced by the surface texture, translucency, fluorescence, opalescence, porcelain brand and batch, number of porcelain firings, porcelain thickness, and condensation technique. 4,5 A ceramic restoration will look more translucent if most of the light is diffusely transmitted and only part of it is scattered. 6-8 Kelly et al 9 reported the core translucency as a pivotal factor in the esthetic outcome and a crucial consideration in material selection. Increasing the crystalline content of the core material improves strength but generally raises the opacity. 3,10 The translucency parameter is measured from the color difference of specimens on black and white backgrounds. 5,7 Some studies have reported that firing causes clinically significant color changes as the pigment breakdown occurs at porcelain firing temperatures. 11,12 However, other investigations have reported that porcelain color remains stable despite repeated firings. 2-4
Effect of thickness of monolithic zirconia ceramic on final color
The Journal of prosthetic dentistry, 2018
Achieving excellent esthetics with monolithic zirconia restorations is challenging, and the impact of monolithic zirconia thickness on the final color is unclear. The purpose of this in vitro study was to assess the effect of thickness of monolithic zirconia ceramic on its final color and to define the minimum thickness needed to gain an acceptable final color. Sixty monolithic zirconia disk specimens with a 10-mm diameter and 3 different thicknesses (0.7, 0.9, and 1.1 mm) were fabricated from 2 zirconia brands. The specimens were divided into 6 groups of 10 based on the thickness and brand. All the specimens were colored with an A2 shade liquid. The specimens were placed on an A4 shade substrate, and their CIELab values were measured with a spectrophotometer. ΔE values were calculated to determine color differences between the specimens and the A2 VITA classical shade tab. The ΔE values were compared with an acceptability threshold (ΔE=3.3). Two-way ANOVA, the Bonferroni test, and ...
Journal of Research in Medical and Dental Science, 2018
Statement of the Problem: Controversy exists regarding the effect of porcelain thickness on color of restoration. Purpose: This study sought to assess the effect of thickness of the veneering ceramic on color parameters of zirconia all-ceramic restorations. Materials and Method: This in vitro experimental study was conducted on 30 discs measuring 10mm in diameter and 0.5mm in thickness fabricated of A3 shade of ZIRCAD zirconia using computer-aided design/computer aided manufacturing (CAD/CAD) system. Discs were divided into three groups (n=10). Disc-shaped metal molds measuring 10mm in diameter and 1, 1.5 and 2mm in height were used to fabricate IPS e.max veneering ceramic in 1, 1.5 and 2mm thicknesses. After applying porcelain and firing, the color parameters (CIE L*a*b*) were measured using a spectrophotometer in three phases of zirconia core, dentin porcelain and glazing. Color difference (ΔE) was compared among the three groups. Data were analyzed using ANOVA and Tukey’s test. R...