The effects of viscoelastic parameters on residual stress development in a zirconia/glass bilayer dental ceramic

Taskonak, Burak; Borges, Gilberto Antônio; Mecholsky, John J.; Anusavice, Kenneth J.; Moore, B. Keith; Yan, Jiahau

doi:10.1016/j.dental.2008.01.004

Cited by 91 publications

(75 citation statements)

References 8 publications

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“…Zirconia has a low thermal expansion, but its low thermal diffusivity results in a high tensile residual stress at the interface with the veneer. [12][13][14][15][16][17][18][19][20][21][22] Tholey et al 23 detected the occurrence of the t/m phase transformation at the stress interface and explained it by the presence of the liquid used to fabricate the veneering ceramics. The aim of this study was to investigate, by using Raman spectroscopy, the occurrence and extent of the phase transformation in Y-TZP ceramic at the veneer-framework interface.…”

Section: -22mentioning

confidence: 99%

Effect of differences in coefficient of thermal expansion of veneer and Y-TZP ceramics on interface phase transformation

Hallmann

Ulmer²,

Wille

et al. 2014

The Journal of Prosthetic Dentistry

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Section: -22mentioning

confidence: 99%

Effect of differences in coefficient of thermal expansion of veneer and Y-TZP ceramics on interface phase transformation

Hallmann

Ulmer²,

Wille

et al. 2014

The Journal of Prosthetic Dentistry

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“…It is known that residual stresses can occur due to a thermal mismatch between the zirconia core and the porcelain veneer, or due to an inadequate cooling rate after the last firing of the porcelain veneer applied on zirconia 11,12,17,23 . However, considering solely porcelain, stresses may also be generated due to a non-uniform solidification resultant from thermal gradients from the surface to the center of the porcelain 7,12 , once the ceramic materials have low thermal diffusivity and low thermal conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…Because of the high stiffness of ceramics materials, residual stresses are produced and it can increase the probability of porcelain veneer chipping during mastication 18,19 . Moreover, considering that zirconia-based substructures have lower thermal diffusivity and thermal conductivity if compared to metallic substructures for metal-ceramic restorations, several firing cycles with different cooling methods have been proposed, which vary antagonistically since slow cooling 7,11,14,20,21 to fast cooling 6,9,10,12,[20][21][22][23] . However, there is no consensus about an ideal firing cycle.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Cooling Rate on the Properties of Veneer Porcelain for Zirconia Dental Prosthesis

et al. 2017

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To solve chipping of veneer porcelain in zirconia dental prosthesis it has been studied different cooling rates in firing schedules to control residual stresses generated by differences in thermal properties between the ceramics. However, cooling rates may affect the porcelain, irrespectively of interaction with zirconia. This study analyzed the effect of cooling rate on the three-point flexural strength (FS), residual stress, Vickers hardness (VH) and V-notch fracture toughness (SEVNB) on a feldspathic porcelain (Vita VM9) indicated for covering zirconia. Bar-shaped specimens were sintered according manufacturer's schedule firing and cooled at different rates (slow, normal or fast). Specimens were tested for FS (n=30), VH (n=15) and SEVNB tests (n=15). Weibull analysis were performed from FS values to measure reliability and probability of failure (PF). One-way ANOVA was significant for VH (p<0.001), and Tukey's test showed that slow cooling led to higher values. There was no significant difference for FS (p=0.654) and SEVNB (p=0.734). Fast cooling led to the lowest PF, but cooling rate factor was not significant for Weibull modulus. All cooling group showed residual tensile stress (MPa): Slow = 34.81; Normal = 27.04; Fast = 18,98. It was concluded that cooling rate produce minor changes in the porcelain properties.

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“…Some investigations showed an inluence of the iring process of the glass ceramic veneering and the diference in the coeicients of thermal expansion [32][33][34].…”

Section: Simulation Methods Applied In All-ceramic Bilayered Crownsmentioning

confidence: 99%

Assessment of All-Ceramic Dental Restorations Behavior by Development of Simulation-Based Experimental Methods

Topală¹,

Porojan²

2017

Insights Into Various Aspects of Oral Health

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New dental materials are often introduced into the market and especially in the current practice, without a basic understanding of their clinical performance because long-term controlled clinical trials are required, which are both time consuming and expensive. Ceramic materials are known for their relatively high fracture resistance and improved aesthetics, but britleness remains a concern. The stressed areas of the materials are key factors for the failure analysis, and numerical simulations may play an important role in the understanding of the behavior of all-ceramic restorations. Simulation-based medicine and the development of complex computer models of biological structures are becoming ubiquitous for advancing biomedical engineering and clinical research. The studies have to be focused on the analysis of all-ceramic restorations failures, investigating several parameters involved in the tooth structure-restoration complex, in order to improve clinical performances. The experiments have to be conducted and interpreted reported to the britle behavior of ceramic systems. Varied simulation methods are promising to assess the biomechanical behavior of all-ceramic systems, and irst principal stress criterion is an alternative for ceramic materials investigations. The development of well-designed experiments could be useful to help to predict the clinical behavior of these new allceramic restorative techniques and materials.

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The effects of viscoelastic parameters on residual stress development in a zirconia/glass bilayer dental ceramic

Cited by 91 publications

References 8 publications

Effect of differences in coefficient of thermal expansion of veneer and Y-TZP ceramics on interface phase transformation

Effect of differences in coefficient of thermal expansion of veneer and Y-TZP ceramics on interface phase transformation

Effect of the Cooling Rate on the Properties of Veneer Porcelain for Zirconia Dental Prosthesis

Assessment of All-Ceramic Dental Restorations Behavior by Development of Simulation-Based Experimental Methods

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