Low temperature degradation of a Y-TZP dental ceramic

Cattani-Lorente, Maria Angeles; Scherrer, Susanne S.; Ammann, Patrick; Jobin, Marc; Wiskott, Anselm

doi:10.1016/j.actbio.2010.09.020

Cited by 210 publications

(182 citation statements)

References 63 publications

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“…Hence, there is a growth of the transformed zone, leading to the extension of microcracks and increased surface roughness; moreover, detachment of these grains still can occur. This same mechanism was used to explain the decrease in hardness values found by Catledge et al 12 , establishing an inverse relationship between the surface roughness and hardness of zirconia 5,10 .…”

Section: Discussionmentioning

confidence: 82%

“…Various authors have designed studies of the surface roughness and hardness of Y-TZP zirconia 5,[7][8][9][10][11][12]20 . These studies have attracted attention because of the degradation process to which zirconia is subject when exposed to the oral environment and, in particular, when it is without veneering porcelain.…”

Section: Discussionmentioning

confidence: 99%

“…Several papers reported the occurrence of t→m phase transformation due to heating of the material in procedures of grinding and/or sandblasting 8,16 , mechanical stress of chewing 10,22 , pH fluctuations 17,18 and humidity 9,10,20 . However, in this study, the mechanical stress caused by the bristles of the toothbrushes and by the abrasiveness of the dentifrice (silica with 3.3µm and RDA equal to 105, calcium carbonate with 2.13μm and RDA equal to 33) 24 were not sufficient to induce a t→m phase transformation or to change the roughness and hardness values of the zirconia.…”

Section: Discussionmentioning

confidence: 99%

“…Mean roughness (Ra) values between 0.2 and 0.98μm can be found [6][7][8] . However, in prolonged contact with a moist environment (water, saliva, blood, synovial fluid), zirconia undergoes a degradation process called aging 3,[9][10][11] , that can change its properties 12 .…”

Section: Introductionmentioning

confidence: 99%

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Surface roughness and hardness of yttria stabilized zirconia (Y-TZP) after 10 years of simulated brushing

Candido

Fais

Reis

et al. 2014

Rev. odontol. UNESP

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Introduction: The Y-TZP zirconia used for prosthetic infrastructure, in some clinical situations, can be exposed to the oral environment. In these situations, a polished surface without changes is extremely important. Objective: The aim of this study was to evaluate the mean roughness (Ra) and Vickers hardness of Y-TZP zirconia (Lava™) after simulating ten years of brushing. Material and method: Thirty-six Y-TZP bar-shaped specimens (20mm X 4mm X 1.2mm) were divided into three groups: storage in distilled water (DW, n=12, control); brushing with distilled water (BDW, n=12) and brushing with distilled water and fluoride toothpaste (BFT, n=12). Brushing was performed using a brushing machine with a soft-bristled toothbrush, simulating 10 years of brushing (878.400 cycles, 100gf). The mean roughness (Ra in μm) and Vickers hardness (VHN) of all specimens were measured twice: before and after the experimental treatment, in profilometer and microhardness tester (500gf, 30 seconds), respectively. Data were analyzed using the two-way ANOVA test (α = 0.05). Result: The interaction between groups was not significant for roughness (p = 0.701) nor for hardness (p = 0.928). The final averages for Ra (μm) were equal to: DW - 0.63; BDW - 0.64; and, BFT - 0.68. The final averages for Vickers hardness (VHN) were: DW - 1301.16; BDW - 1316.60; and, BFT - 1299.58. Conclusion: It was concluded that the brushing with distilled or fluoridated toothpaste was not able to change the roughness and hardness of Y-TZP zirconia used in this study.

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface roughness and hardness of yttria stabilized zirconia (Y-TZP) after 10 years of simulated brushing

Candido

Fais

Reis

et al. 2014

Rev. odontol. UNESP

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“…1 Y-TZP is a metastable material with a high crystalline content, Luís Felipe GUILARDI (a) Gabriel Kalil Rocha PEREIRA (b) Vinícius Felipe WANDSCHER (c) Marília Pivetta RIPPE (d) Luiz Felipe VALANDRO (d) consisting mainly of 0.2-0.5 µm diameter uniform equiaxed grains prepared from fine ZrO 2 (zirconia) particles and 3.5-8.7 mol% of Y 2 O 3 (yttria) stabilizer, which stabilizes the zirconia in its tetragonal phase. 2 The tetragonal phase (t) stabilization at room temperature does not completely prevent its transformation into the monoclinic phase (m). Different stimuli (mechanical, physical and/or chemical) can trigger this transformation.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of yttria-stabilized tetragonal zirconia polycrystal: Effects of different aging regimens

et al. 2017

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This study aimed to characterize and compare the effect of different aging regimens on surface characteristic (topography and roughness), structural stability (phase transformation) and mechanical performance (Weibull analysis) of a Y-TZP ceramic. Discs (15 × 1.2 mm; VITA In-Ceram YZ) were prepared according to ISO 6872-2015 for biaxial flexural strength testing and randomly assigned into five groups (n = 30): as-sintered, no aging treatment (CTRL); 20 h in autoclave at 134°C, 2 bar pressure (AUT); intermittent mechanical loading at 20 Hz/10 6 load pulses (MechLoad); AUT followed by MechLoad (AUT+MechLoad); and storage in distilled water at 37°C, for 1 year (STO). The following analyses were performed: roughness (n = 30), surface topography (n = 2), phase transformation (n = 2) and biaxial flexure strength (n = 30). Phase transformation (increase of m-phase content) was shown to be a spontaneous, unavoidable and time-dependent process, occurring even under ambient conditions (dry storage after 1 year = 6.0% increase), and is considerably accelerated in the presence of moisture (STO = 17.6%; AUT= 63.1%; and AUT+MechLoad = 59.9%). For roughness parameters, only Ra was affected by aging, and the highest values were observed for AUT+MechLoad (0.25 ± 0.07 µm). For Weibull analysis, structural reliability (Weibull moduli) and characteristic strength were not impaired after aging, and some aging conditions led to increased values (highest weibull moduli in AUT, and highest characteristic strength in STO). Phase transformation proves to be a time-dependent spontaneous mechanism that is accelerated in the presence of different stimuli. However, none of the aging regimens had a negative effect on the characteristic strength and structural reliability of Y-TZP ceramic.

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Nanoindentation Characterization of the Hardness of Zirconia Dental Ceramics

2013

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Hardness characterization is a key issue for the evaluation of the resistance to contact damage of dental materials. In this study, nanoindentation tests were conducted on four commercial zirconia dental ceramics. For each material, the measured nanohardness exhibits significant indentation size effect, i.e., the measured hardness decreases with increasing peak load. The so‐called load‐independent nanohardness was determined based on a second‐order polynomial analysis of the variation of the contact depth with the peak load. Finally, a brief discussion was conducted on the reliability and the applicability of the determined load‐independent nanohardness.

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Low temperature degradation of a Y-TZP dental ceramic

Cited by 210 publications

References 63 publications

Surface roughness and hardness of yttria stabilized zirconia (Y-TZP) after 10 years of simulated brushing

Surface roughness and hardness of yttria stabilized zirconia (Y-TZP) after 10 years of simulated brushing

Mechanical behavior of yttria-stabilized tetragonal zirconia polycrystal: Effects of different aging regimens

Nanoindentation Characterization of the Hardness of Zirconia Dental Ceramics

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