Fractographic analyses of zirconia-based fixed partial dentures

Taskonak, Burak; Yan, Jiahau; Mecholsky, John J.; Sertgöz, Atilla; Koçak, Ayşe

doi:10.1016/j.dental.2007.12.006

Cited by 99 publications

(79 citation statements)

References 17 publications

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“…Nonetheless, in previous studies on the chipping and delamination of veneering ceramics from zirconia frameworks, these occurrences were not solely nor directly associated with weak core-veneer bond strength 10) . In a study that focused on the fractographic analysis of fractured ceramic FPDs 5) , it was found that crack propagation in zirconia-based FPDs was different from that in lithia-disilicate-based FPDs, whereby the crack propagated immediately in the latter. Although the core layer was tougher than the veneer, the crack did not arrest or deviate out of the original propagation plane once crack propagation began in the veneer.…”

Section: Effect Of Core-veneer Bond Strength On Delamination and Fracmentioning

confidence: 99%

“…In addition, the design Table 10 One-way ANOVA results on the shear bond strength values of DC-Zirkon with all the veneering ceramics and dimension of the connectors as well as the span size of FPDs can be key factors in causing fractures at lower occlusal loads but due to high fracture stresses 5) . Adhesive failure does not occur in the presence of a good bond between compatible ceramic core and veneering materials 23) .…”

Section: Effect Of Core-veneer Bond Strength On Delamination and Fracmentioning

confidence: 99%

“…Moreover, when the high strength of ceramic cores is combined with the superior esthetics of weaker veneering ceramics, reliable and more biocompatible restorations are attained 4) . Presently, numerous materials are available as allceramic core materials: leucite-reinforced ceramics, glass-infiltrated ceramics, lithium disilicate, alumina, and zirconia 5) . Amongst which, zirconia offers many unique qualities to render it as the core material of choice for fixed partial dentures (FPDs): high strength, transformation toughening mechanism, white appearance, chemical and structural stability 6) .…”

Section: Introductionmentioning

confidence: 99%

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In vitro evaluation of shear bond strength of veneering ceramics to zirconia

2010

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The bond strength between veneering ceramic and zirconia framework is the weakest link in the layered structure. To investigate the shear bond strength (SBS) of veneering ceramics to zirconia, four types of zirconia ceramics (Zirkonzahn, Cercon, Lava, DCZirkon) were selected. For each zirconia system, 30 disk specimens were layered with IPS e.max Ceram, Vita VM9, and a manufacturerrecommended veneering ceramic. SBS test was conducted, and fracture surface analysis was also performed to determine the failure modes. One-way ANOVA, two-way ANOVA, and Tukey's HSD tests were used to analyze the data. On shear bond strength between zirconia and their recommended veneering ceramics, statistically significant differences were observed among the different zirconia systems (p<0.001). DC-Zirkon exhibited the highest SBS value (40.49±8.43 MPa), followed by Lava (27.11±2.72 MPa), Zirkonzahn (24.46±3.72 MPa), and Cercon (20.19±5.12 MPa). On shear bond strength to IPS e.max Ceram and Vita VM9, significantly lower values (p<0.001) were observed for these veneering ceramics than their recommended veneering ceramics for DC-Zirkon and Lava. For Zirkonzahn and Cercon, similar SBS values were observed for all kinds of veneering ceramics (p>0.05). In conclusion, the bonding of manufacturer-recommended veneering ceramic to the zirconia framework differed according to zirconia type.

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Section: Effect Of Core-veneer Bond Strength On Delamination and Fracmentioning

confidence: 99%

Section: Effect Of Core-veneer Bond Strength On Delamination and Fracmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In vitro evaluation of shear bond strength of veneering ceramics to zirconia

2010

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“…A Y-TZP apresenta comportamento mecânico superior às demais cerâmicas odontológicas devido a seu conhecido mecanismo de tenacificação por transformação de fase [5][6][7]. A Y-TZP 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 ½ [2,4,5,[8][9][10]. Essa cerâmica é indicada para a construção de infraestruturas de coroas e próteses parciais fixas (PPFs) em todas as regiões da cavidade oral.…”

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Efeito do tratamento de superfície na resistência de união entre porcelana e uma cerâmica à base de zircônia

2017

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INTRODUÇÃOEmbora as próteses fixas metalocerâmicas sejam consideradas o "padrão ouro", as próteses totalmente cerâmicas vêm ocupando cada vez mais espaço no mercado devido à introdução na Odontologia da tecnologia CAD-CAM Efeito do tratamento de superfície na resistência de união entre porcelana e uma cerâmica à base de zircônia ResumoA substituição do metal utilizado como infraestrutura de restaurações protéticas pela cerâmica policristalina à base de zircônia tetragonal estabilizada por ítria (Y-TZP) resultou em dúvidas sobre a qualidade de união entre as cerâmicas de infraestrutura e de recobrimento. Assim, surgiram alguns tratamentos de superfície com o intuito de melhorar a união porcelana-Y-TZP. O objetivo deste estudo foi avaliar o efeito de um tratamento de superfície na resistência de união entre a porcelana e a Y-TZP, bem como comparar os resultados com um grupo controle metal-cerâmica. Três grupos experimentais foram avaliados (n=10): YC -infraestrutura de Y-TZP recoberta com porcelana VM9; YB -infraestrutura de Y-TZP recoberta com um agente de união e porcelana VM9; MCinfraestrutura de níquel-cromo recoberta com opaco e porcelana VM13. Os corpos de prova foram confeccionados usando lâminas do material de infraestrutura, e sobre elas foi construído um cilindro de porcelana (3 mm de diâmetro, 6 mm de altura), sinterizado de acordo com as instruções do fabricante. Os grupos foram submetidos ao teste de cisalhamento em uma máquina de ensaio universal com velocidade de 0,5 mm/min. Após os testes, as falhas foram classificadas como adesiva, mista ou coesiva. Os dados de resistência de união (σ f ) foram analisados estatisticamente com Anova de um fator (α=0,05). As médias (desvio-padrão) de σ f (MPa) foram: YC -19,7 (7,8); YB -22,5 (6,4); MC -24,2 (6,6). Não foi encontrada diferença estatística entre os grupos (p=0,377). Houve relação entre o grupo experimental e o modo de falha. Apenas os grupos YC e YB apresentaram falha coesiva na porcelana. Concluiu-se que a infraestrutura à base de Y-TZP tem resistência de união à porcelana semelhante ao "padrão ouro" metal-cerâmica. A aplicação de um agente de união não teve influência na resistência de união entre porcelana e Y-TZP. Palavras-chave: cerâmica, prótese parcial fixa, resistência ao cisalhamento. Abstract The replacement of the metal used as infrastructure in prosthetic restorations with yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) raised questions regarding the quality of the bond strength between the ceramic infrastructure and veneer. Therefore, surface treatments were developed in order to improve porcelain-Y-TZP bond strength. The objective of this study was to evaluate the effect of a surface treatment on the bond strength between the porcelain veneer and Y-TZP, as well as to compare the results with a metalceramic control group. Three experimental groups were evaluated (n=10): YC -Y-TZP infrastructure veneered with VM9 porcelain; YB -Y-TZP infrastructure veneered with a bond agent and VM9 porcelain; MC -nickel

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“…No que tange à mecânica da fratura de materiais cerâmicos, quando a tensão na ponta de um defeito ou trinca presente na porcelana atinge valores críticos, esta se propaga no interior do material e induz à fratura ou delaminação da porcelana e pode se continuar pela infraestrutura. As falhas desta natureza nas próteses parciais fixas totalmente cerâmicas de très ou mais elementos acometem, na maior parte das vezes, a região dos conectores e iniciam-se na porção gengival, área que concentra as tensões de tração (8).…”

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Influência da inserção de fibras de Al2O3/GdAlO3 na resistência mecânica de monolayers e bilayers de cerâmicas odontológicas

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ABSTRACTinterface and fractographyc analysis were carried out after scanning electronic microscopy (SEM) of bars. X-ray difratometry and dilatometry were also performed.Vm9 porcelain showed incompatibility with the fibers, probably due to differences between the coefficients of thermal expansion of fibers and porcelain. VM7 monolayers with the addition of 17% of fibers in volume showed significantly higher resistance in relation to control. It was concluded that the inclusion of ceramic fibers of Al 2 O 3 /GdAlO 3 to veneer porcelain improves its flexural strength.

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Fractographic analyses of zirconia-based fixed partial dentures

Cited by 99 publications

References 17 publications

In vitro evaluation of shear bond strength of veneering ceramics to zirconia

In vitro evaluation of shear bond strength of veneering ceramics to zirconia

Efeito do tratamento de superfície na resistência de união entre porcelana e uma cerâmica à base de zircônia

Influência da inserção de fibras de Al2O3/GdAlO3 na resistência mecânica de monolayers e bilayers de cerâmicas odontológicas

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