Comparative Evaluation of the Translucency of Monolithic Zirconia (original) (raw)
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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
The Journal of prosthetic dentistry, 2016
Studies comparing the translucency of zirconias and lithium disilicates are limited. The purpose of this in vitro study was to measure the translucency of recently developed translucent zirconias and compare them with lithium disilicate. Five types of zirconia, Prettau Anterior (Zirkonzahn GmbH), BruxZir (Glidewell Laboratories), Katana HT, Katana ST, and Katana UT (Kurary Noritake Dental Inc), and 1 type of lithium disilicate, e.max CAD LT (Ivoclar Vivadent AG), were assessed. Non-colored zirconia test specimens (n=5) were prepared as rectangles with dimensions of 15×10×0.5 and 15×10×1.0 mm. The shade of lithium disilicate was B1. A spectrophotometer (Evolution 300 UV-Vis) with an integrating sphere was used to evaluate the total transmittance of light as a percentage (Tt%) at a wavelength of 555 nm for comparison among groups. The Welch robust test for equality of means was used to compare group means (α=.025) and post hoc pairwise comparisons among groups were performed with the ...
2024
Background Recent forms of translucent zirconia material have been developed, offering a wide range of options and varieties for enhancing aesthetics, making it a preferred choice in the field of prosthetic dentistry. However, there is insufficient understanding regarding the recent types of zirconia materials and their optical behavior. Understanding the variables that influence the translucency of zirconia and identifying strategies to enhance its esthetics are crucial. Purpose The current systemic review highlights a comprehensive understanding of different zirconia generations in relation to their optical characteristics and evaluates material-related variables affecting their translucency. Methods The present review studied in-vitro studies that evaluated the optical characteristics of different yttria content of yttria stabilized materials. The topics explored were: (1) the different zirconia material generations and their optical behavior; (2) material-related factors that affect their translucency. The research was restricted to online publication in the English language from July 1, 2010, to July 31, 2023, using PubMed, Scopus, and Science Direct resources. The search key terms and their combinations were "zirconia, " "translucent zirconia, " "cubic zirconia, " "highly translucent zirconia, " "yttria partially stabilized zirconia, " "monolithic zirconia, " "translucency, " "optical properties, " and "light transmission. " Results The data obtained from fifty-three studies addressed the optical characteristics of various zirconia generations. They reported that changing yttria content had a significant impact on translucency. Different kinds of zirconia ceramics of the same generation have varying translucencies. Achieving optimum aesthetics with monolithic zirconia is challenging due to factors related to material aspects such as the presence of additives, point defects, microstructure, thickness, phase distribution, and sintering conditions. Conclusions Newly developed monolithic dental zirconia ceramics have improved aesthetics and translucency. However, additional research is necessary to evaluate their performance and long-term durability. Trial Registration This systematic review was registered in PROSPERO, under number CRD42023474482.
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.
Effect of accelerated aging on translucency of monolithic zirconia
Future Dental Journal, 2016
The objective of the study was to evaluate the translucency of different thickness of a translucent zirconia before and after accelerated aging. Materials and methods: Sixty slices of translucent zirconia were obtained by cutting InCoris TZI blocks into slices using Micracut precision cutting machine. The slices were divide into four groups (n ¼ 15) according to their thickness (0.5 mm, 0.8 mm, 1 mm and 1.2 mm). CIE lab coordinates were measured for each slice against black and white backgrounds using vita easy shade and TP was calculated. All specimens were subjected to accelerated aging using autoclave (134 ºC, 0.2 MPa) and TP was calculated after accelerated aging. One way analysis of variance combined with a Tukey-post hoc test was used to analyze the data obtained (P ¼ 0.05). Results: Results of the present study showed that thickness of zirconia has determinal effect on its translucency as there was no statistically significant difference in TP between 0.5 mm and 0.8 mm thicknesses while there were statistically significant differences in TP between 0.8 mm, 1.0 mm, 1.2 mm. Effect of aging was significant on 0.5 mm thickness. Conclusion: Thickness of zirconia has significant effect on translucency. Aging has significant effect on thinner sections of zirconia. More research is required on zirconia towards making the material more translucent for its potential use as esthetic monolithic restoration.
The use of monolithic [yttria (Y2O3)-stabilized tetragonal zirconia (ZrO2) polycrystalline] (Y-TZP) ceramics to restore teeth is expanding in dentistry. However, there are still some problems about color matching and the translucency of these ceramics. The employment of Y-TZP ceramics in aesthetically critical regions is questionable due to the insufficient translucency and opacity of the restorations. The objective of this review was to assess the factors affecting the translucency of monolithic Y-TZP ceramics for a better understanding the relevant parameters in restorations. The translucency of polycrystalline ceramics is a complex phenomenon. Apprehending the translucency regarding ceramics requires their knowledge of physical, chemical and microstructural characteristics with the light interactions among them.
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.
Translucency of zirconia copings made with different CAD/CAM systems
The Journal of Prosthetic Dentistry, 2010
The results of this study may be helpful in determining which zirconia coping material is most translucent and where it can be used to improve esthetic appearance when considering zirconia-based restorations. Lava Frame with a 0.3-mm thickness demonstrated the highest translucency of the materials tested and may be more suitable for anterior applications. The least translucent of the zirconia cores could be used for masking purposes. The masking effect can be increased using larger coping thicknesses. Statement of problem. Zirconia cores are reported to be less translucent than glass, lithium disilicate, or alumina cores. This could affect the esthetic appearance and the clinical choices made when using zirconia-based restorations.
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 ...
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...