Mechanical performance of Y-TZP monolithic ceramic after grinding and aging: Survival estimates and fatigue strength

Dapieve, Kiara Serafini; Guilardi, Luí S Felipe; Silvestri, T.; Rippe, Marília Pivetta; Pereira, Gabriel Kalil Rocha; Valandro, Luiz Felipe

doi:10.1016/j.jmbbm.2018.07.041

Cited by 36 publications

(15 citation statements)

References 34 publications

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“…Previous studies have not used a storage period of more than 2 years. However, the 5year results appear consistent with the 2-year storage reported by Dapieve et al [46], where the m-phase content of unpretreated specimens increased by 13%. Prior hydrothermal aging led to the highest monoclinic value of 75.27%, which is consistent with the present study.…”

Section: Discussionsupporting

confidence: 91%

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: Discussionsupporting

confidence: 91%

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

et al. 2019

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“…Polishing after grinding was determined mandatory in order to prevent crack propagation and to enhance the material’s fatigue [93]. A 2nd generation zirconia ceramic was submitted to grinding and artificial aging to assess its fatigue strength and survival rates and it was found that its properties were not compromised [94].…”

Section: Strength Of Monolithic Zirconiamentioning

confidence: 99%

“…The mechanical properties of cubic crowns (UHT) were lower than for tetragonal ones.No values are reported, complete absence of hydrothermal degradation for UHT.Ultra high translucency (UHT)steam autoclave 134 °C, 2 bars, for 2, 6, 18 and 54 hHigh translucency (HT)Standard translucency (ST)Prado et al (2017) [92]Zirlux FCFlexural strength, crosshead speed 1 mm min −1 Low temperature degradation led to an increase in flexural strengthcontrol group: 58.17%Aging: Grinding with extra-fine diamond burs (grit size 30 μm) under constant water-cooling, autoclave storage at 134 °C / 2 bar / 20hground samples: 9.25%ground + low temperature degradation: 16.13Pereira et al (2018) [82]Katana YSZ ceramics used:Flexural strength (piston-on-three balls), crosshead-speed 1 mm min −1 , step stress fatigue approach, autoclave aging at 134 °C / 2 bars pressure/20 hNo significant change for STML and UTML.- Increase for ML– ML/HTSignificant increase for ML.- No impact on STML and UTML- STML- UTMLAlmansour et al (2018) [83]- Lava Plus HTFlexural strength (piston-on-three balls), crosshead-speed 0.5 mm min −1 , fatigue (chewing simulator with 250,000 cycles / frequency of 1.6 Hz / load of 200 N), accelerated artificial aging at 3500 cycles (two water baths, 5 °C and 55 °C. 60 sec per cycle in 5 °C bath, 10 sec to transfer samples to 55 °C bath, 20 seconds in 55 °C bath and 10 seconds to transfer back to 5 °C bathbefore: Ceramill ZI (935.3 ± 47.1 MPa)>Copran Zr-i Monolithic HT (847.8 ± 20.7 MPa)>Lava Plus (732.4 ± 25.5 MPa)>Ceramill Zolid White (685.7 ± 32.6 MPa)Not evaluated- Ceramill Zolid White HTafter: Copran Zr-i Monolithic HT (777.5 ± 21.2 MPa)>Ceramill ZI (668.0 ± 20.1 MPa)>Lava Plus (666.4 ± 21.1 MPa)>Ceramill Zolid White (575.0 ± 36.3 MPa)- Copran Zr-i Monolith HT- Ceramill ZI-LTDapieve et al (2018) [94]- Zirlux FC2…”

Section: Strength Of Monolithic Zirconiamentioning

confidence: 99%

Strength and aging resistance of monolithic zirconia: an update to current knowledge

Kontonasaki

Giasimakopoulos

Rigos

2020

Japanese Dental Science Review

112

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New zirconia compositions with optimized esthetic properties have emerged due to the fast-growing technology in zirconia manufacturing. However, the large variety of commercial products and synthesis routes, make impossible to include all of them under the general term of “monolithic zirconia ceramics”. Ultra- or high translucent monolithic formulations contain 3–8 mol% yttria, which results in materials with completely different structure, optical and mechanical properties. The purpose of this study was to provide an update to the current knowledge concerning monolithic zirconia and to review factors related to strength and aging resistance. Factors such as composition, coloring procedures, sintering method and temperature, may affect both strength and aging resistance to a more or less extend. A significant reduction of mechanical properties has been correlated to high translucent zirconia formualtions while regarding aging resistance, the findings are contradictory, necessitating more and thorough investigation. Despite the obvious advantages of contemporary monolithic zirconia ceramics, further scientific evidence is required that will eventually lead to the appropriate laboratory and clinical guidelines for their use. Until then, a safe suggestion should be to utilize high-strength partially-stabilized zirconia for posterior or long span restorations and fully-stabilized ultra-translucent zirconia for anterior single crowns and short span fixed partial dentures.

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“…Studies have investigated different techniques for treating zirconia core to optimize bond strength; these methods include grinding, sandblasting, laser scanning, airbrush spraying, and fine-brush painting approaches [9][10][11][12]. A five-year follow up survival rate of more than 90% was recorded by an in vitro study after surface modification following the sandblast technique [13].…”

Section: Introductionmentioning

confidence: 99%

Comparative Effectiveness of Multiple Laser Scanning and Conventional Techniques on Zirconia Shear Bond Strength

Abdullah

Pollington

et al. 2019

Coatings

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This study aimed to compare the impact of different laser scanning with that of conventional methods on zirconia surface treatment through evaluation of shear bond strength (SBS) values. One hundred and thirty-two sintered zirconia cubic-samples were prepared and randomly divided into six study groups: milling control (without surface treatment); grinding; sandblasting; and three-times, four-times, and five-times laser scanning groups. The treatment process for the first three groups was performed before the zirconia coating, while the last three groups were treated after zirconia coating with veneer slurry through a spraying technique. In the current study, the surface roughness Ra, contact angle measurement, phase transformation, topography and interfaces, SBS in unaged and aged conditions, and fracture mode patterns of zirconia cores were investigated. The results were analyzed using laser confocal scanning microscopy, drop analyzer, X-ray diffractometry (XRD), scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), universal testing machine and stereomicroscope. The results indicated that three-times laser scanned specimens presented higher Ra values than the other studied groups. The minimum contact angle value was detected in the mentioned group, while the control group presented the highest value. The XRD showed phase transformation from tetragonal to monoclinic t–m following grinding and sandblasting. However, the laser scanned specimens and the control group preserved the structural integrity of the zirconia core, presenting the tetragonal phase only. The highest SBS values were recorded in specimens treated with three-times laser scanning in the unaged and aged conditions. A mixed fracture was a common fracture pattern among the studied groups. The results confirmed that SBS could be optimized through three-times laser scanning and it provided better adhesion between zirconia and the veneer ceramic material. Multiple scanning processes of more than three times are not recommended for zirconia surface treatment.

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Mechanical performance of Y-TZP monolithic ceramic after grinding and aging: Survival estimates and fatigue strength

Cited by 36 publications

References 34 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

Strength and aging resistance of monolithic zirconia: an update to current knowledge

Comparative Effectiveness of Multiple Laser Scanning and Conventional Techniques on Zirconia Shear Bond Strength

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