Effect of Different Coloring Procedures on the Aging Behavior of Dental Monolithic Zirconia

Agingu, Check; Jiang, Neng-wu; Cheng, Hui; Yu, Hao

doi:10.1155/2018/2137091

“…The study's findings demonstrated that after aging, A2 liquid-shaded zirconia's flexural strength was lower than that of A2 pre-shaded zirconia, but this difference was statistically non-nsignificant. This is in agreement with Agingu et al (2018) (65) investigated the impact of various coloring techniques on the aging behavior of monolithic zirconia and came to the non-significant conclusion that aging and coloring techniques decreased flexural strength.…”

Section: Discussionsupporting

confidence: 89%

Effect of Different Shading Techniques on Color, Translucency and Flexural Strength of Zirconia Ceramic after Aging

Elbadry

¹

,

Mohsen²,

Hashem³

2022

Egyptian Dental Journal

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Purpose:The ultimate appearance of all ceramic restorations is significantly influenced by color and translucency. The performance of the restoration is significantly influenced by flexural strength. This study's objective was to assess how various shading methods affected the color, translucency, and flexural strength of monolithic zirconia ceramic as it aged.Materials and Methods: Thirty zirconia discs with a diameter of 12mm and thickness of 1mm were divided into two groups of 15 discs each according to the technique of shading, the first group was constructed from A2 pre-shaded zirconia while the second group was constructed from unshaded zirconia that was shaded by immersion in A2 coloring liquid. Aging was done using acetic acid 4% for both groups. Color and translucency were measured using a spectrophotometer before and after artificial aging. Flexural strength was measured using a universal testing machine before and after aging. Data were collected, tabulated, and statistically analyzed. Results:Color change of both pre-shaded and liquid-shaded zirconia were within the clinically acceptable range (1.7±0.3) and (1.9±0.3) respectively and there was no significant difference in translucency between both groups' P value (0.253). Flexural strength increased from (921.9±73.3) before aging to (1025.1±178.5) after aging with pre-shaded zirconia while it decreased from (938.6±32.7) before aging too (899±54.5) after aging with liquid shaded zirconia but this difference was statistically non-significant. Conclusion:The shading technique had no noticeable effect on color, translucency, or flexural strength before or after aging.

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“…At ambient pressure, zirconia can exhibit 3 allotropic crystal phase structures: a monoclinic phase ( m ) from room temperature to 1170°C, a tetragonal phase ( t ) from 1170°C to 2370°C, and a cubic phase ( c ) above 2370°C to its melting point at 2715°C and boiling point of 4300°C [ 4 , 5 ]. To stabilize the t and c phases of zirconia at room temperature, the addition of different amount of stabilizing oxides, such as yttria (Y 2 O 3 ), to pure zirconia crystals is essential and well studied [ 2 , 4 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Aging on the Color and Translucency of Monolithic Translucent Y-TZP Ceramics: A Systematic Review and Meta-Analysis of In Vitro Studies

Zhang

¹

,

Agingu

²

,

Tsoi

³

et al. 2021

BioMed Research International

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Background. Monolithic restorations made of translucent yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) have become popular over the past few decades. However, whether aging affects the color and translucency of monolithic translucent Y-TZP is unclear. Objective. The aim of this systematic review and meta-analysis of in vitro studies was to evaluate the effects of aging on the color and translucency of monolithic translucent Y-TZP ceramics. Materials and Methods. This systematic review/meta-analysis was reported according to the PRISMA statement and registered in the OSF registries (https://osf.io/5qjmu). Four databases including Medline via the PubMed, Embase, and Web of Science databases and the Cochrane Library were searched using no publication year and language limits. The last search was executed on November 20, 2020. In vitro studies comparing the translucency and/or color of monolithic translucent Y-TZP ceramics before and after simulated aging were selected. Meta-analyses were performed using Review Manager software (version 5.3, Cochrane Collaboration, Oxford, UK) with random-effects models at a significance level of 0.05. A risk-of-bias assessment was also performed for the included studies. Results. Of the 188 potentially relevant studies, 13 were included in the systematic review. The hydrothermal aging duration ranged from 1 to 100 h at relatively similar temperatures (~134°C). In the general meta-analyses, the aged Y-TZP ceramics exhibited similar translucency parameter (TP), L ∗ , and b ∗ values compared with the nonaged controls ( P = .73 , P = .49 , and P = .62 , respectively). Moreover, there was a significant difference between the aged and nonaged Y-TZP ceramics in the a ∗ value ( P = .03 ; MD = − 0.26 ; 95% CI = − 0.51 to − 0.02 ), favoring the nonaged Y-TZP ceramics. The subgroup analyses showed that the duration of aging contributed to changes in the translucency and color of the Y-TZP ceramics. Conclusions. The optical properties of monolithic translucent Y-TZP ceramics were stable after hydrothermal aging at 134°C and 0.2 MPa for ≤20 h. Moreover, clinically unacceptable changes in the translucency and color of monolithic translucent Y-TZP ceramics were found after hydrothermal aging for >20 h.

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“…A previous study reported no significant reduction in the flexural strength of Y-TZP material after aging. 30 This is possibly related to the inherited property of zirconia that is capable of exhibiting low-temperature degradation (LTD) properties. Once the Y-TZP is exposed to the aging process, which was in a humid environment for a long period, the water molecules are capable of penetration into the zirconia structure.…”

Section: Discussionmentioning

confidence: 99%

Flexural Strength of Different Monolithic Computer-Assisted Design and Computer-Assisted Manufacturing Ceramic Materials Upon Accelerated Aging

Juntavee,

Chansathien

et al. 2024

Eur J Dent

0

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Objectives The durability of ceramic is crucial, which is probably influenced by aging. This study evaluated the effect of aging on flexural strength of different ceramics. Materials and Methods One-hundred twenty ceramic discs (Ø 12 mm, 1.5 mm thickness) were prepared from zirconia-reinforced lithium silicate (ZLS, C), lithium disilicate (LS2, E), precolored yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP, Ip), and customized color Y-TZP (Ic). Samples were randomly divided into two groups for accelerated aging (A) between 5 and 55°C water baths, 30-second immersing time each, for 10,000 cycles, and nonaged group (N), serving as control. Biaxial flexural strength (σ) was evaluated utilizing the piston-on-three-balls at 0.5 mm/min speed. Analysis of variance and Tukey comparisons were determined for significant differences (α = 0.05). Weibull analysis was applied for survival probability, Weibull modulus (m), and characteristic strength (σo). Microstructures were evaluated with scanning electron microscopy and X-ray diffraction (XRD). Results The highest σ and σo were seen for IcN, followed by IcA, IpN, IpA, EN, CA, CN, and EA, respectively. CN showed the highest m, while EA showed the lowest m. Significant differences of σ for each ceramic were indicated (p < 0.05). Aging caused a significant difference in σ (p < 0.05). XRD showed t→m phase transformation of Ip and Ic after aging. Conclusion Aging affected strength of ceramics. Comparable strength between LS2 and ZLS was evidenced, but both were less strength than Y-TZP either aging or non-aging. Comparable strength between precolored Y-TZP and customized color Y-TZP was indicated. Better resisting aging deterioration of Y-TZP than LS2 and ZLS is suggested for fabrication restorative reconstruction.

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Effect of Different Coloring Procedures on the Aging Behavior of Dental Monolithic Zirconia

Cited by 12 publications

References 34 publications

Effect of Different Shading Techniques on Color, Translucency and Flexural Strength of Zirconia Ceramic after Aging

Effect of Different Shading Techniques on Color, Translucency and Flexural Strength of Zirconia Ceramic after Aging

Effects of Aging on the Color and Translucency of Monolithic Translucent Y-TZP Ceramics: A Systematic Review and Meta-Analysis of In Vitro Studies

Flexural Strength of Different Monolithic Computer-Assisted Design and Computer-Assisted Manufacturing Ceramic Materials Upon Accelerated Aging

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