Effects of aging procedures on the topographic surface, structural stability, and mechanical strength of a ZrO2-based dental ceramic

Cotes, Caroline; Arata, Anelyse; Melo, Renata Marques de; Bottino, Marco Antônio; Machado, João Paulo Barros; Souza, Rodrigo Othávio de Assunção e

doi:10.1016/j.dental.2014.08.380

Cited by 78 publications

(56 citation statements)

References 30 publications

(60 reference statements)

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“…Nevertheless, strength values of the all specimens not influenced by aging (p>0.05). This results is consistent with a similar invitro study, investigating the fracture strength of Y-TZP ceramics with aging 27) . Although the aging time likely to be experienced in vivo has not been determined, a provisional estimate of oral conditions was suggested.…”

Section: Discussionsupporting

confidence: 82%

“…Clinically, an appropriate strength characteristics is an important aspect of dental restoration. According to previous studies, the long-term strength properties of all-ceramic restorations depend upon several factors, such as fabrication type [14][15][16][17] , laboratory procedures [18][19][20][21] , core or veneer thickness 4,7,22) , fatique resistance 23) , luting procedure 24,25) , and aging 11,14,[26][27][28] . Thus, it is important to determine the mechanical behavior of this category of dental materials in vitro.…”

Section: Introductionmentioning

confidence: 99%

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Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

et al. 2017

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The purpose of this study was to investigate the flexural strength of all-ceramics with varying core thicknesses submitted to aging. In-Ceram Alumina (IC), IPS e.max Press (EM) and Katana (K) (n=40), were selected. Each group contained two core groups based on the core thickness as follows: IC/0.5, IC/0.8, EM/0.5, EM/0.8, K/0.5 and K/0.8 mm in thickness (n=20 each). Ten specimens from each group were subjected to aging and all specimens were tested for strength in a testing machine either with or without being subjected aging. The mean strength of the K were higher (873.05 MPa) than that of the IC (548.28 MPa) and EM (374.32 MPa) regardless of core thickness. Strength values increased with increasing core thickness for all IC, EM and K regardless of aging. Results of this study concluded that strength was not significantly affected by aging. Different core thicknesses affected strength of the all-ceramic materials tested (p<0.05).

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

et al. 2017

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“…This hypothesis is supported by the findings of Chevalier et al 2007 43 , who described phase transformation as starting at the surface, as observed in the current study, and proceeding into the bulk of the material 5,8,42 . As this material was used to produce restorations that will be used in an oral environment (submitted to the action of water, temperature changes, and mechanical forces), future studies associating the effects of LTD and load-fatigue should be conducted, as load application could intensify the material degradation under LTD simulation 44 .…”

Section: Discussionmentioning

confidence: 99%

Effect of low-temperature aging on the mechanical behavior of ground Y-TZP

Pereira

Amaral

César

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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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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Effects of aging procedures on the topographic surface, structural stability, and mechanical strength of a ZrO2-based dental ceramic

Cited by 78 publications

References 30 publications

Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

Effect of low-temperature aging on the mechanical behavior of ground Y-TZP

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

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