Effect of accelerated aging on dental zirconia-based materials

Souza, Grace M. De; Zykus, Angelica; Ghahnavyeh, Reza Rahbari; Lawrence, Samantha K.; Bahr, David F.

doi:10.1016/j.jmbbm.2016.08.023

Cited by 49 publications

(28 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hardness results of the current study showed that the aging had no effect on the hardness which are in good accordance to the finding of others [60]. In contrast, some studies showed a strong correlation between the reduction of hardness and the increase of monoclinic phase.…”

Section: Discussionsupporting

confidence: 91%

Influence of Aging on Biaxial Flexural Strength and Hardness of Translucent 3Y-TZP

et al. 2019

View full text Add to dashboard Cite

The purpose of this research was to evaluate the influence of aging and surface treatment on surface roughness, biaxial flexural strength (BFS), and Vickers hardness (VHN) of translucent dental zirconia. Half of 80 disc-shaped zirconia specimens (1.2 mm thickness and 12 mm diameter) were aged (group A) in an autoclave for 20 h (134 °C and 0.2 MPa) and the other half were not aged (group N). Specimens were subjected to: no surface treatment (SIN), particle air-abrasion with 50 µm alumina particles at 1 bar (0.1 MPa) and 2.5 bar (0.25 MPa), or polishing down to 1 µm (POL). Specimens were analyzed using X-ray diffraction, laser scanning microscope, BFS, and VHN tests. Three groups (N-SIN, N-POL, and A-POL) showed almost no monoclinic phase. While other groups showed monoclinic phase ratios ranging from 7.5 vol. % ± 2.4 vol. % (N-0.1 MPa) to 41.5 vol. % ± 0.3 vol. % (A-0.1 MPa). Aging and particle air-abrasion increased significantly the BFS, ranging from 720 ± 37 MPa (N-SIN) to 1153 ± 92 MPa (N-0.1 MPa). The hardness was not influenced significantly by aging. A certain amount of monoclinic phase at the surface strengthens the high translucent dental zirconia, while hardness and roughness are not influenced. The pressure of particle air-abrasion showed no influence on the evaluated properties.

show abstract

Section: Discussionsupporting

confidence: 91%

Influence of Aging on Biaxial Flexural Strength and Hardness of Translucent 3Y-TZP

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The present results also come in agreement with De souza et al, [41] and Kelch et al, [42] , who analyzed the influence of hydrothermal aging on zirconia and stated that hydrothermal aging affects monoclinic phase content and surface topography.…”

Section: Translucency Evaluation Was Evaluated By Calculating Contrassupporting

confidence: 93%

Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia

latif

El-olimy

El-Ebiary

2020

Egyptian Dental Journal

View full text Add to dashboard Cite

“…Increased monoclinic phase content was also reported with 0.4 MPa instead of 0.2 MPa [16,17]. Hydrothermal aging affects monoclinic phase content and surface topography [33], which manifests as an increase in monoclinic phase. This has been reported by different authors, who analyzed the influence of hydrothermal aging on zirconia [27,31,42].…”

Section: Discussionmentioning

confidence: 79%

Impact of different pretreatments and aging procedures on the flexural strength and phase structure of zirconia ceramics

et al. 2019

View full text Add to dashboard Cite

OBJECTIVE To test the impact of zirconia pretreatment and aging on flexural strength and phase structure. METHODS For flexural strength measurements, 180 3Y-TZP 0.25 specimens were fabricated and pretreated: (i) air-abraded (105-m alumina, 0.25MPa), (ii) air-abraded (50-m alumina, 0.25MPa), (iii) air-abraded (30-m silica-coated alumina, 0.28MPa) (iv) non-pretreated. Each pretreated group (n=15) was aged: (a) hydrothermal (134°C, 0.23MPa, 2h) (b) in a mastication simulator (1,200,000×, 5/55°C) and (c) not aged. The fractured specimens were stored dry for 5 years (23°C) for analysis of phase transformation. Additionally, specimens were fabricated from 3Y-TZP 0.25 (n=12) and 3Y-TZP 0.05 (n=8), pretreated (i, ii, iii, iv), and hydrothermally aged. Each air-abrasion method was alternated using 0.05, 0.25 and 0.4MPa pressure. The phase transformation was examined by Raman spectroscopy and surface topography by scanning electron microscope. Data were analyzed using univariate ANOVA with the Scheffé post hoc test and partial-eta-squared (p ²) (=0.05). RESULTS The highest impact on flexural strength was exerted by the pretreatment (P ²=0.261, p<0.001), followed by interactions between pretreatment and aging (P ²=0.077, p=0.033). Non-pretreated and non-aged specimens showed the lowest monoclinic percentage. Hydrothermal aging and 5 years of storage at room temperature increased the monolithic percentage of 3Y-TZP 0.25. The highest phase transformation was observed in groups air-abraded with 105-m alumina particles. Increasing pressure during the air-abrading process increased the content of the monoclinic phase in zirconia surfaces. SIGNIFICANCE Air-abrasion with 30m silica-coated alumina powder can be recommended for pretreatment of 3Y-TZP 0.25 and 3Y-TZP 0.05. For air-abrasion using alumina powder lower pressure should be used.

show abstract

Effect of accelerated aging on dental zirconia-based materials

Cited by 49 publications

References 31 publications

Influence of Aging on Biaxial Flexural Strength and Hardness of Translucent 3Y-TZP

Influence of Aging on Biaxial Flexural Strength and Hardness of Translucent 3Y-TZP

Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia

Impact of different pretreatments and aging procedures on the flexural strength and phase structure of zirconia ceramics

Contact Info

Product

Resources

About