Aging of 3Y-TZP dental zirconia and yttrium depletion

Pandoleon, Panagiotis; Kontonasaki, Eleana; Kantiranis, Nikolaos; Pliatsikas, N.; Patsalas, P.; Παπαδοπούλου, Λ.; Zorba, T.; Paraskevopoulos, K. M.; Koidis, Petros

doi:10.1016/j.dental.2017.07.011

Cited by 37 publications

(18 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the Y-TZP is exposed to stress, its metastable structure undergoes a t→m phase transformation, resulting in a volumetric expansion that can stop crack propagation [5]. However, the t→m transformation of zirconia can occur without stress under moist conditions, which is referred to as low temperature degradation (LTD) or aging [6]. After the transformation, intergranular microcracking appears, which degenerates the mechanical properties of the Y-TZP [7,8].…”

Section: Introductionmentioning

confidence: 99%

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

Agingu

Jiang

Cheng

et al. 2018

Journal of Spectroscopy

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Agingu

Jiang

Cheng

et al. 2018

Journal of Spectroscopy

View full text Add to dashboard Cite

show abstract

“…Zirconia has a wide range of use in dentistry due to its superior mechanical and esthetic properties, biocompatibility, and low bacterial adhesion [6,7]. However, long-term use of zirconia might decrease the durability and sturdiness of the material due to the constant exposure of saliva and wetting and thermal changes [16,17]. Zirconia is a crystalline material which has three phases, and thermal changes in the oral environment caused by hot and cold food and beverages lead to shifting in phases and thus LTD in long-term [11-13, 18, 19].…”

Section: Discussionmentioning

confidence: 99%

“…The transition between the phases leads to a significant volumetric change. This structural expansion leads to tensile forces and cracks in the ceramic, reducing the hardness and durability of the material [16,17]. In prosthetic restorations, zirconia in the tetragonal phase is preferred, but to keep the zirconia stable in the tetragonal phase, pure zirconia should be modified such as addition of compounds like magnesium, calcium, scandium, yttrium, neodymium or cerium (CeO 2 ), magnesium oxide (MgO) or yttrium oxide (Y 2 O 3 ) [7,16,17].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of wear and fracture strength of zirconia-based ceramics and metal-supported ceramics after treatment with the chewing simulator

Tekin

Hayran

2019

Preprint

View full text Add to dashboard Cite

Background: The aim of this study was to evaluate the fracture resistance and wear amounts of different zirconia and metal-supported ceramics. Methods: Katana, Prettau, Zenostar, InCoris TZI, BruxZir and porcelain fused to metal (PFM) were used (n=10). All samples were aged via thermal-cycling. Wear test was performed in chewing simulator. Occlusal wear was measured via a 3D laser-scanner. Fracture resistance of samples was determined via a universal testing machine. For statistics, One-Way ANOVA and Tukey were used. Results: PFM had the highest wear area, and differences among groups were significant. BruxZir, Zenostar, and InCoris TZI had lower wear than Prettau and Katana, but the differences were not significant. All groups had similar wear volume. Fracture resistance was significantly lower in Katana and PFM than Zenostar, InCoris TZI, and Prettau. The difference between Katana and PFM was significant. BruxZir samples were not broken even with the highest force applied. Conclusions: Monolithic zirconia ceramics showed superior wear behavior compared to PFM in terms of wear area; however 3D wear measurements were similar. Fracture resistance was also higher in zirconia except for Katana, which had the lowest value. BruxZir was the hardest material with the lowest wear and highest fracture resistance.

show abstract

“…Moreover, after hydrothermal aging for 100 h, the biaxial flexural strength decreased to 756 MPa, reducing by 42.8%. One possible reason is that the m-phase volume fraction increased through the phase transformation of t→m increased during hydrothermal aging [26,27]. Our previous reports found that the monoclinic phase content could increase 75% after 100 h hydrothermal aging [21].…”

Section: Microstructure Surface Morphology and Compositionmentioning

confidence: 97%

Preparation, Microstructure, Mechanical Properties and Biocompatibility of Ta-Coated 3Y-TZP Ceramic Deposited by a Plasma Surface Alloying Technique

Zheng

Dong

et al. 2020

Materials

View full text Add to dashboard Cite

A Ta coating has been successfully fabricated on the surface of zirconia polycrystals ceramic (3 mol% yttria, 3Y-TZP) by a plasma surface alloying technique. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that a α-Ta coating with a continuous and compact surface morphology which consisted of a deposited layer with a thickness of 390 nm and a diffusion layer with a thickness of 200 nm covered the 3Y-TZP. Due to the effect of inhabitation the t→m transformation by the deposited Ta coating, the biaxial flexural strength caused by the phase transformation during hydrothermal aging is reduced e.g., p < 0.05 after 20 h and/or 100 h. In addition, the Ta coating shows non-cytotoxicity and improved proliferation ability of osteoblasts.

show abstract

Aging of 3Y-TZP dental zirconia and yttrium depletion

Cited by 37 publications

References 41 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

Evaluation of wear and fracture strength of zirconia-based ceramics and metal-supported ceramics after treatment with the chewing simulator

Preparation, Microstructure, Mechanical Properties and Biocompatibility of Ta-Coated 3Y-TZP Ceramic Deposited by a Plasma Surface Alloying Technique

Contact Info

Product

Resources

About