The effect of grinding on the mechanical behavior of Y-TZP ceramics: A systematic review and meta-analyses

Pereira, Gabriel Kalil Rocha; Fraga, Sara; Montagner, Anelise Fernandes; Soares, Fábio Zovico Maxnuck; Kleverlaan, Cornelis J.; Valandro, Luiz Felipe

doi:10.1016/j.jmbbm.2016.06.028

Cited by 79 publications

(71 citation statements)

References 76 publications

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“…Our study corroborates that assumption, since we used the methodology preconized by this systematic review (14) to avoid defect introduction (handpieces coupled to slow speed motors and the use of plenty coolant) and we did not notice a deleterious effect, even using coarse diamond burs during grinding. As stated previously, restorations clinically fail by fatigue effects (15).…”

Section: Fatigue Strength Of Ground and Aged Y-tzpsupporting

confidence: 84%

“…Some studies (11,14) explains that the higher resistance to hydrothermal degradation (increase in m-phase content -low-temperature degradation) of ground Y-TZP would be possibly related to the existence of this very thin layer of tetragonal re-crystallized nano-grains (10-20 nm), whose size is smaller than the critical size for transformation in humid environment, in addition to the presence of residual stress.…”

Section: Fatigue Strength Of Ground and Aged Y-tzpmentioning

confidence: 99%

“…Those adjustments will lead to t → m phase transformation and also to the introduction of defects (11)(12)(13). On this sense, literature shows that the outcome (toughness mechanism or LTD) will depend on the balance between these two factors: phase transformation and introduction of defects (14).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

et al. 2018

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This study aimed to investigate the effect of grinding and multi-stimuli aging on the fatigue strength, surface topography and the phase transformation of Y-TZP ceramic. Discs were manufactured according to ISO-6872:2008 for biaxial flexure testing (diameter: 15 mm; thickness: 1.2 mm) and randomly assigned considering two factors "grinding" and "aging": C-control (as-sintered); CA-control + aging; G-ground; GA-ground + aging. Grinding was carried out with coarse diamond burs under water-cooling. Aging protocols consisted of: autoclave (134°C, 2 bars pressure, 20 hours), followed by storage for 365 days (samples were kept untouched at room temperature), and by mechanical cycling (10 6 cycles by 20 Hz under a load of 50% from the biaxial flexure monotonic tests). Flexural fatigue strengths (20,000 cycles; 6 Hz) were determined under sinusoidal cyclic loading using staircase approach. Additionally, surface topography analysis by FE-SEM and phase transformation analysis by X-ray Diffractometry were performed. Dixon and Mood methodology was used to analyze the fatigue strength data. Grinding promotes alterations of topographical pattern, while aging apparently did not alter it. Grinding triggered t-m phase transformation without impacting the fatigue strength of the Y-TZP ceramic; and aging promoted an intense t-m transformation that resulted in a toughening mechanism leading to higher fatigue strength for as-sintered condition, and a tendency of increase for ground condition (C < CA; G = GA). It concludes that grinding and aging procedures did not affect deleteriously the fatigue strength of the evaluated Y-TZP ceramic, although, it promotes surface topography alterations, except to aging, and t-m phase transformation. Effect of Grinding and Multi-S t i m u l i A g i n g o n t h e F a t i g u e S t r e n g t h o f a Y-T Z P C e r a m i c

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Section: Fatigue Strength Of Ground and Aged Y-tzpsupporting

confidence: 84%

Section: Fatigue Strength Of Ground and Aged Y-tzpmentioning

confidence: 99%

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Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

et al. 2018

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“…5,6,12,14,23,24 Pereira and collaborators 8 stated that the critical point of m-phase content for a deleterious effect on mechanical performance should be above 50%. Our data show that the AUT+MechLoad group, even with 60% m-phase content, had a statistically higher characteristic strength than the as-sintered condition.…”

Section: Discussionmentioning

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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“…Grinding was performed by a single trained operator following the protocol recommended on the systematic review by Pereira et al 16 Extra-fine diamond burs (#3101FF -grit size 30 µm; KG Sorensen, Cotia, Brazil) coupled to a contra-angle handpiece (T2 REVO R170 contra-angle handpiece of 170,000 rpm, Sirona, Bensheim, Germany) combined with a low-speed motor (Kavo Dental, Biberach, Germany) under constant water-cooling (≈30 ml/min) were used; the diamond bur was replaced after each specimen. Caution was taken to increase reproducibility and standardize wear thickness during grinding, following the grinding protocol previously described in the literature.…”

Section: Grindingmentioning

confidence: 99%

Effect of ceramic thickness, grinding, and aging on the mechanical behavior of a polycrystalline zirconia

et al. 2017

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Monolithic restorations of Y-TZP have been recommended as a restorative alternative on prosthetic dentistry as it allows a substantial reduction of ceramic thickness, which means a greater preservation of tooth structure. However, the influence of grinding and aging when using a thinner layer of the material is unclear. This investigation aimed to evaluate and compare the effects of ceramic thickness (0.5 mm and 1.0 mm), grinding and aging (low-temperature degradation) on the mechanical behavior and surface characteristics of a full-contour Y-TZP ceramic. Y-TZP disc-shaped specimens (15 mm diameter) were manufactured with both thicknesses and randomly assigned into 4 groups considering the factors 'grinding with diamond bur' and 'aging in autoclave'. Surface topography (roughness, 3D profilometry and SEM), phase transformation, flexural strength and structural reliability (Weibull) analyses were executed. Grinding affected the surface topography, while aging did not promote any effect. An increase in m-phase content was observed after grinding and aging, although different susceptibilities were observed. Regardless of zirconia's thickness, no deleterious effect of grinding or aging on the mechanical properties was observed. Thus, in our testing assembly, reducing the thickness of the Y-TZP ceramic did not alter its response to grinding and low temperature degradation and did not impair its mechanical performance.

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The effect of grinding on the mechanical behavior of Y-TZP ceramics: A systematic review and meta-analyses

Cited by 79 publications

References 76 publications

Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

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

Effect of ceramic thickness, grinding, and aging on the mechanical behavior of a polycrystalline zirconia

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