Effect of Aging Time and Thickness on Low‐Temperature Degradation of Dental Zirconia

Zhuang, Yongxiang; Zhu, Ziyuan; Jiao, Ting; Sun, Junqiang

doi:10.1111/jopr.12946

Cited by 21 publications

(17 citation statements)

References 27 publications

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“…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: 56%

“…A thick specimen-configuration of 4 mm could hide a possible effect of phase transformation on the flexural strength of zirconia, which is why authors have used thin specimens ranging from 0.6 to 1.3 mm [11,12], especially when it comes to aging [27]. A thickness of 1 mm was chosen for the present study, as a further reduction of the specimen thickness does not seem to show additional effects [28].…”

Section: Discussionmentioning

confidence: 99%

“…Severe surface destruction during air-abrasion deeper than the compressive stress layer can cause a decrease in strength[18].Regarding hydrothermal aging, the use of 105-µm alumina powder led to reduced flexural strength, consistent with the analysis of the phase structure which revealed the highest amount of monoclinic phase after air-abrasion with 105-µm alumina powder. LTD with a decrease in the flexural strength and an increase in monoclinic phase after hydrothermal aging has been reported by other authors[27,31]; however, the impact of air-abrasion prior to aging was not analyzed. The opposing behavior of the other pretreatment groups could be explained by the shorter autoclaving duration of 2 h at 134 °C and 0.23 MPa compared with these earlier studies, where autoclaving parameters ranged from 5 to 200 h at 134 to 180 °C and 0.1 to 0.2 MPa.…”

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confidence: 86%

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

et al. 2019

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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.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 86%

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

et al. 2019

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“…This strengthened the assumption that the tested zirconia crowns were made of typical Y-TZP dental zirconia. In addition, as the monoclinic phase was not identified, it implied that the materials used were not destabilized by the manufacturing or storage processes [32]. Although the presence of the (c) phase was not expected in Y-TZP, its presence was hardly distinguished in the Raman analysis, due to the fact that (t) and (c) share overlapping characteristic peaks [31].…”

Section: Discussionmentioning

confidence: 99%

Surface, Microstructural, and Mechanical Characterization of Prefabricated Pediatric Zirconia Crowns

Diener

Polychronis

Erb³

et al. 2019

Materials

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The purpose of this study was to characterize the surface roughness, the microstructure, and mechanical properties of four prefabricated zirconia pediatric crowns. Ten prefabricated crowns from four different manufacturers (Cheng Crowns Zirconia), (EZCrowns), (NuSmile ZR), and (Zirconia Pediatric Crowns) were included in this study. The surface roughness parameters (Sa, Sq, Sz, Sc, and Sv) of all samples were studied by optical profilometry and then the microstructure was studied by Raman spectroscopy. Then, all samples were embedded in epoxy resin and after metallographic polishing, the Martens hardness (HM), indentation modulus (EIT), elastic index (ηIT), Vickers hardness (HV), and fracture toughness (KIC) were identified by the Instrumented Indentation Testing (IIT). All data were statistically analyzed by a one-way ANOVA and a Tukey multiple comparison test at α = 0.05. Only the tetragonal phase of zirconia for all materials tested was identified after Raman analysis. However, statistically significant differences were found among the surface roughness parameters, HV and KIC, while no differences were allocated for HΜ, EIT, and ηΙΤ. Although the materials tested shared a similar microstructure, significant differences in surface roughness parameters HV and KIC were identified and, thus, differences in their clinical performance were anticipated.

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“…Another reason for the different translucency between PSZ and FSZ may be due to the different sintering protocols. Differences in sintering conditions affect the porosity, grain size and can thereby influence the translucency [48] . Previous studies observed an impact of sintering parameters of zirconia materials on contrast ratio values and reported that higher sintering temperatures/times led to decreased contrast ratio values.…”

Section: Translucency Evaluation Was Evaluated By Calculating Contrasmentioning

confidence: 99%

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

latif

El-olimy

El-Ebiary

2020

Egyptian Dental Journal

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Effect of Aging Time and Thickness on Low‐Temperature Degradation of Dental Zirconia

Abstract: A thinner Y-TZP specimen was likely to present surface defects and microcracks after aging. In addition, the flexural strengths decreased with a decrease in the thickness, a notable fact for further studies.

Cited by 21 publications

References 27 publications

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

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

Surface, Microstructural, and Mechanical Characterization of Prefabricated Pediatric Zirconia Crowns

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

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