The firing procedure influences properties of a zirconia core ceramic

Øilo, Marit; Gjerdet, Nils Roar; Tvinnereim, Helene Meyer

doi:10.1016/j.dental.2007.04.008

Cited by 55 publications

(44 citation statements)

References 29 publications

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“…This finding is supported by several studies on the effect of porcelain veneering on the accuracy of fit of zirconia restorations [12][13][14]26) . An exception was found with a study by Vigolo and Fonzi 15) , who reported that veneering did not affect the fitting accuracy of zirconia restorations.…”

Section: Strain Developmentsupporting

confidence: 76%

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

Karl¹,

Graef²,

Wichmann³

et al. 2012

Dent. Mater. J.

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The effect of ceramic veneering on the passivity of fit of cast metal and CAD/CAM-fabricated zirconia ceramic implant-supported three-unit cement-retained restorations was investigated, as well as the effect of misfit stress on the marginal integrity of ceramic veneers. Superstructures were fabricated using cast metal or by CAD/CAM milling of presintered or HIP zirconia ceramic (n=10). Before and after veneering, strain gages were used to measure in vitro the strain developed in all the restorations as a result of superstructure fixation. Fluorescent penetrant method was used to detect microcracks developed in ceramic veneers. Cast frameworks showed significantly higher strain values than CAD/CAM frameworks (p=0.000). Veneering significantly increased strain development in all CAD/CAM frameworks (p=0.000). Compared to zirconia ceramic restorations, significantly more microcracks were observed in cast restorations (p=0.000) both before and after superstructure fixation.

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Section: Strain Developmentsupporting

confidence: 76%

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

Karl¹,

Graef²,

Wichmann³

et al. 2012

Dent. Mater. J.

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“…This was explained by the compressive stresses caused by surface treatment such as sandblasting were released in the heat treatment and the mean flexural strength was influenced by sandblasting-induced defects in the material. Øilo et al [12] found that heat treatment of the veneering process lowered the flexural strength of zirconia, but multiple firing cycles did not further lower the strength. These materials were machined to restorations after final sintering.…”

Section: Discussionmentioning

confidence: 99%

“…Chevalier et al [11] found that heat treatment of the zirconia at 1200°C releases residual stresses without affecting the surface relief. In recent studies it has been found that the heat treatment by the veneering process lowers the strength of zirconia, which has been milled and ground in the sintered form [12,13]. When grinding sintered zirconia, the milling and grinding caused a phase change from tetragonal to monoclinic on the surface of the zirconia.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Heat Treatment and Feldspathic Glazing on Some Mechanical Properties of Zirconia

Hjerppe

Fröberg

Lassila

et al. 2010

Silicon

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Purpose In dental practice, zirconia substructures for crowns and fixed partial dentures are veneered with feldspathic porcelain for better aesthetical properties. The purpose of this study was to evaluate the effect of heat treatment during the veneering process on the mechanical properties of zirconia. Methods 105 zirconia (ICE Zirkon, Zirkonzahn, Italy) disc shaped specimens were divided into seven groups (n=15/ group) and sintered at 1500°C. Control specimens (group 1) were left as such. Specimens in the study groups were: 2) one heat treatment in a porcelain firing furnace; 3) a heat treatment with two firing cycles; 4) one heat treatment with a thin coating of feldspathic glazing on the tension side; 5) two heat treatments with a thin coating of feldspathic wash and glazing on the tension side; 6) one heat treatment with a thin coating of feldspathic glazing on the compression side; 7) two heat treatments with a thin coating of feldspathic wash and glazing on the compression side. Biaxial flexural strength and surface microhardness of the specimens (diameter 19 mm, thickness 1.2 mm) were measured. The effect of heat treatment and feldspathic glazing on the phase transformations of zirconia was determined by XRD-analysis. The data were calculated using ANOVA-analysis.Results Repeated heat treatment did not influence the mechanical properties of zirconia (p>0.05). No difference (p>0.05) was found in terms of the surface microhardness between the groups. Some transformation from the tetragonal to the monoclinic phase was seen on the surface of the specimens after heat treatment and feldspathic glazing coating. Conclusions Repeated heat treatment does not affect the strength of zirconia milled in the green-stage form.

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“…Esse sistema cerâmico apresenta valores médios de resistência à flexão variando entre 700 e 1500 MPa e tenacidade à fratura entre 4,4 e 9,4 MPa.m 1/2 (Liu;Chen, 1991;Kosmac et al, 1999;Tinschert et al, 2000;Luthardt et al, 2002;Guazzato et al, 2004a;Tinschert et al, 2007;Yilmaz et al, 2007;Oilo et al, 2008;Taskonak et al, 2008a). Foram reportados, para a YZ, valores de dureza ao redor de 12 GPa e módulo de elasticidade entre 220 e 240…”

Section: Zircônia Tetragonal Parcialmente Estabilizada Com óXido De íunclassified

“…Por isso, sugere-se que a sinterização da camada de porcelana sobre a infra-estrutura da YZ possa provocar essa reversão de fase, resultando na liberação das tensões de compressão presentes na superfície cerâmica e, conseqüentemente, na diminuição da resistência à fratura. Oilo et al (2008) relataram redução nos valores de resistência à flexão e microdureza da cerâmica YZ após tratamento térmico com temperaturas utilizadas no processo de sinterização e glaze da cerâmica de cobertura.…”

Section: Zircônia Tetragonal Parcialmente Estabilizada Com óXido De íunclassified

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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The firing procedure influences properties of a zirconia core ceramic

Cited by 55 publications

References 29 publications

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

The Effect of Heat Treatment and Feldspathic Glazing on Some Mechanical Properties of Zirconia

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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