Low temperature degradation of single layers of multilayered zirconia in comparison to conventional unshaded zirconia: Phase transformation and flexural strength

Wille, Sebastian; Zumstrull, Paul; Kaidas, Victor; Jessen, Lea Katharina; Kern, Matthias

doi:10.1016/j.jmbbm.2017.09.010

Cited by 53 publications

(38 citation statements)

References 44 publications

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“…Kim et al [32] investigated the flexural strength of Y-TZP ceramics after various aging treatments, and the results indicated that the threshold of V m , at which point the flexural strength begins to decrease, was 12-54%. Furthermore, V m of up to 40% at the surface of Y-TZP did not significantly influence the biaxial flexural strength, which has recently been confirmed by Wille et al [12]. Although a significant t→m transformation was observed, aging did not impair the flexural strength of Y-TZP in the present study, which is also consistent with a recently published systematic review stating that there is no decrease in flexural strength up to 50% of phase transformation at the surface [15].…”

Section: Discussionsupporting

confidence: 93%

“…In another laboratory study, up to 40% V m was observed on a Y-TZP surface after 20 h of hydrothermal aging. However, this extent of phase transformation failed to significantly affect the biaxial flexural strength of the Y-TZP tested [12]. Moreover, Flinn et al [13] reported a significant correlation between the decrease in the flexural strength and the increase in V m for certain types of Y-TZP (Prettau and BruxZir).…”

Section: Introductionmentioning

confidence: 93%

“…However, the effect of coloring was found to be dependent on the liquid. Wille et al [12] reported that different concentrations of coloring pigments led to different LTD behavior of the zirconia and up to 40% of the monoclinic phase was detected after aging. Shah et al [20] concluded that there was no detectable amount of the monoclinic phase in Y-TZP colored by coloring liquids or in uncolored controls.…”

Section: Introductionmentioning

confidence: 99%

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

Agingu

Jiang

Cheng

et al. 2018

Journal of Spectroscopy

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Objective.is study aimed to investigate the effect of different coloring procedures on the aging behavior of dental monolithic zirconia. Methods. Two types of translucent zirconia (SuperfectZir HTS, Aidite; Katana HT, Kuraray) were tested. Bar-shaped specimens with dimensions of 22 × 4 × 2 mm were prepared from uncolored and precolored blocks. Before being sintered, specimens made from uncolored blocks were colored by dipping them into a coloring liquid, whereas the precolored specimens were not treated. e specimens were then divided into 4 subgroups (n � 13) according to the aging conditions (no aging, 134°C/0.2 MPa for 5 h, 134°C/0.2 MPa for 10 h, and 134°C/0.2 MPa for 20 h). e flexural strength of the specimens was tested with the 4-point flexure. e crystalline phase composition of the specimens was analyzed by XRD. e subsurface microstructure of the fractured specimens was examined by using a SEM. e data were statistically analyzed using 3-way ANOVA and Tukey's test (α � 0.05). Results. Significant differences were found in the flexural strength between the two zirconia materials tested (P < 0.001). Aging and coloring procedures showed no significant effect on the flexural strength of the zirconia. Aging and coloring procedures significantly affected the t→m transformation of the zirconia. e monoclinic phase increased with the aging time. After aging, the precolored specimens showed a significantly higher t→m transformation than the specimens that were dipped in the coloring liquids. After aging for 20 h, the depth of the transformed zone with an irregular surface was approximately 6 µm for SuperfectZir HTS, whereas no detectable transformation zone was observed for Katana HT. Conclusion. Aging and coloring procedures had no significant effects on the flexural strength of the zirconia tested. e coloring procedure had a significant effect on the phase transformation of the zirconia subjected to hydrothermal aging.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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

Agingu

Jiang

Cheng

et al. 2018

Journal of Spectroscopy

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“…Our results in this respect conform to the reports of previous other studies (24,25) who reported that aging did not affect strength even after prolonged durations.…”

Section: Dd Cubex2supporting

confidence: 93%

Optical Properties and Flexural Strength of Artificially Aged Tetragonal/Cubic Ultra-Translucent Zirconia

Ahmed¹,

Mandour²,

El-Sharkawy³

2020

ADJ-for Girls

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Purpose: The present study aimed to evaluate the effect of artificial aging on the optical properties and flexural strength of ultra-translucent tetragonal/cubic zirconia. Materials and Methods: A total of 30 (N=30) ultra-translucent cubic zirconia discs (DD cube X 2) were fabricated. Samples were divided into 3 equal groups (n=10) according to the aging protocol followed including Group (1): (control), samples were not subjected to hydrothermal aging protocol, (n=10), Group (2): Samples were subjected to one-hour hydrothermal aging protocol, (n=10), Group (3): Samples were subjected to 3 hours hydrothermal aging protocol, (n=10). Samples of each group were subjected to optical properties determination using spectrophotometer including (Translucency parameter TP, Contrast ratio CR, Change in color ΔE) and biaxial flexural strength determination using universal testing machine. Obtained values were statistically analyzed. Results: Statistical analysis using ANOVA test revealed no significant difference between the three tested groups. The highest mean value of translucency and biaxial flexural strength were recorded at the control group. While group (3) samples recorded the lowest mean values. Color change (ΔE) was performed for groups (2 and 3) to detect the amount of color change from control group. Group (3) samples recorded higher mean values than group (2) samples. Conclusions: Hydrothermal aging did not affect the optical properties and flexural strength of tetragonal / cubic zirconia (DD cube X 2).

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“…The mechanical strength of samples was measured by a biaxial flexural strength test (n=5), which was performed using the piston-on-three ball technique 15) in a universal testing machine (Autograph AG-X, Shimadzu, Kyoto, Japan). Three 3.2-mm-diameter stainless steel balls that were equidistant from each other were placed on a circle (diameter, 10 mm).…”

Section: Mechanical Strength Measurementsmentioning

confidence: 99%

Toughening of highly translucent zirconia by monoclinic ZrO<sub>2</sub> and SiO<sub>2</sub> particle coating

et al. 2020

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The mechanical properties of highly translucent partially stabilized zirconia (PSZ) need to be improved; however, improvement of mechanical properties often decreases translucency. To overcome this problem, a monoclinic ZrO2 (mZrO2)/SiO2 dispersion was prepared and applied as a coating material for PSZ. The influence of surface treatment by the mZrO2/SiO2 dispersion on the surface topography, crystallography, and mechanical properties of highly translucent PSZ was investigated in this study. Following the treatment, the mechanical strength of highly translucent PSZ improved by 170% compared with control, for the best mZrO2/SiO2 dispersion ratio and heating temperature condition, while maintaining its translucency. The proposed coating is promising for improving the mechanical properties of highly translucent PSZ.

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Low temperature degradation of single layers of multilayered zirconia in comparison to conventional unshaded zirconia: Phase transformation and flexural strength

Cited by 53 publications

References 44 publications

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

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

Optical Properties and Flexural Strength of Artificially Aged Tetragonal/Cubic Ultra-Translucent Zirconia

Toughening of highly translucent zirconia by monoclinic ZrO<sub>2</sub> and SiO<sub>2</sub> particle coating

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