Microstructural changes in ground 3Y-TZP and their effect on mechanical properties

Muñoz-Tabares, J.A.; Jiménez‐Piqué, E.; Reyes‐Gasga, J.; Anglada, M.

doi:10.1016/j.actamat.2011.07.024

Cited by 66 publications

(59 citation statements)

References 49 publications

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“…39 Thus, the increased resistance to hydrothermal degradation after grinding is possibly related to the existence of this very thin layer of tetragonal recrystallized nano-grains (10-20 nm) that are smaller than the critical size for transformation in humid environment, in addition to the presence of residual compressive stress on the surface of Y-TZP ceramics. 39,40 Although the tested Y-TZP ceramic consists of a new translucent material, and therefore alterations on microstructure and composition (that are not clearly stated by the manufacturer) may be expected in comparison to conventional Y-TZP ceramics 4 , our data support a similar performance of the tested ceramic to the ones that have been evaluated by previous studies. 15,16,17,18,19 Finally, we showed that the protocols for grinding and aging used by this study do not promote a deleterious effect on the mechanical properties of Y-TZP ceramic, regardless of the ceramic thickness.…”

Section: Discussionmentioning

confidence: 99%

“…38 According to Muñoz-Tabarez et al, 39 the microstructural changes induced by grinding of Y-TZP consist of three well defined layers, from the surface to the interior: a) a superficial crystallized zone, where grain diameter range from 10 to 20 nm approximately; b) a plastically deformed zone; and c) a zone in which tetragonal to monoclinic phase transformation take place, which is mainly responsible for the formation of compressive residual stresses that usually increases the flexure strength and apparent fracture toughness of ground specimens. 39 Thus, the increased resistance to hydrothermal degradation after grinding is possibly related to the existence of this very thin layer of tetragonal recrystallized nano-grains (10-20 nm) that are smaller than the critical size for transformation in humid environment, in addition to the presence of residual compressive stress on the surface of Y-TZP ceramics. 39,40 Although the tested Y-TZP ceramic consists of a new translucent material, and therefore alterations on microstructure and composition (that are not clearly stated by the manufacturer) may be expected in comparison to conventional Y-TZP ceramics 4 , our data support a similar performance of the tested ceramic to the ones that have been evaluated by previous studies.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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“…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%

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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“…However, the titanium addition could affect the changes of m ? t transformation temperatures and the amount of monoclinic phase in the sintered material [3,19,20].…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior and thermal expansion of zirconia–titanium composites

Łada

Miazga

Konopka

et al. 2017

J Therm Anal Calorim

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The dilatometric and thermogravimetric methods were used to investigate the sintering conditions of 3Y-ZrO 2 and 3Y-ZrO 2 -Ti composites. For the materials preparation, the nanometric zirconia stabilized by 3 mol% Y 2 O 3 powder and micrometric titanium powder (3 and 10 vol%) were used. The green body samples were formed by slip casting method. The morphology of samples microstructures was determined by SEM observations. The stereological analysis of zirconia and zirconia-titanium composites was carried out using computer program. The density was measured using the Archimedes method. The hardness of sinters was also investigated. Addition of Ti into ZrO 2 influenced the sintering behavior and thermal expansion of obtained composites. The analysis of the sintering process and characteristic temperatures confirmed the increase of onset and final temperature of shrinkage with the increase in Ti content. The changes of the thermal expansion curves for the pure zirconia and 3Y-ZrO 2 -Ti composites were the result of the aTi ? bTi transformation and the transition temperature of the zirconia m ? t transformation. The zirconia and composite samples were characterized by relative density about 98%, close to theoretical density. The slight growth of zirconia grains was observed.

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Microstructural changes in ground 3Y-TZP and their effect on mechanical properties

Cited by 66 publications

References 49 publications

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

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

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

Sintering behavior and thermal expansion of zirconia–titanium composites

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