Analyses of layer-thickness effects in bilayered dental ceramics subjected to thermal stresses and ring-on-ring tests

Hsueh, Chun‐Hway; Thompson, Geoffrey A.; Jadaan, Osama M.; Wereszczak, A. A.; Becher, Paul

doi:10.1016/j.dental.2006.12.009

Cited by 52 publications

(44 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thick alumina or zirconia frameworks are to be favored to optimize the support of the veneering ceramic. Whenever the thickness of the veneer is twice or more than that of the core, the risk of chipping is increased considerably [4,41,42]. In response, so-called anatomical core designs have been used in clinical studies with promising results [43,44].…”

Section: Occlusal Contact Locations and Framework Designmentioning

confidence: 99%

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

2015

View full text Add to dashboard Cite

Objectives The aims of this study were set as follows:1. To provide verifiable criteria to categorize the ceramic fractures into non-critical (i.e., amenable to polishing) or critical (i.e., in need of replacement) 2. To establish the corresponding survival rates for alumina and zirconia restorations 3. To establish the mechanism of fracture using fractography Materials and methods Fifty-eight patients restored with 115 alumina-/zirconia-based crowns and 26 zirconia-based fixed dental prostheses (FDPs) were included. Ceramic fractures were classified into four types and further subclassified into "critical" or "non-critical." Kaplan-Meier survival estimates were calculated for "critical fractures only" and "all fractures." Intra-oral replicas were taken for fractographic analyses. Results Kaplan-Meier survival estimates for "critical fractures only" and "all fractures" were respectively: Alumina single crowns: 90.9 and 68.3 % after 9.5 years (mean 5.71 ± 2.6 years). Zirconia single crowns: 89.4 and 80.9 % after 6.3 years (mean 3.88±1.2 years). Zirconia FDPs: 68.6 % (critical fractures) and 24.6 % (all fractures) after 7.2 and 4.6 years respectively (FDP mean observation time 3.02±1.4 years). No core/framework fractures were detected. Conclusions Survival estimates varied significantly depending on whether "all" fractures were considered as failures or only those deemed as "critical". For all restorations, fractographic analyses of failed veneering ceramics systematically demonstrated heavy occlusal wear at the failure origin. Therefore, the relief of local contact pressures on unsupported ceramic is recommended. Occlusal contacts on mesial or distal ridges should systematically be eliminated. Clinical relevance A classification standard for ceramic fractures into four categories with subtypes "critical" and "noncritical" provides a differentiated view of the survival of ceramic restorations.

show abstract

Section: Occlusal Contact Locations and Framework Designmentioning

confidence: 99%

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

2015

View full text Add to dashboard Cite

show abstract

“…Nos corpos-de-prova monolíticos, as tensões são uniformes através da estrutura e não dependem do módulo de elasticidade do material (Guazzato et al, 2005;Hsueh et al, 2008).…”

Section: Sorensenunclassified

“…Nesses casos a tensão necessária para fratura do material de infra-estrutura foi maior do que a tenacidade da interface. Além disso, foi demonstrado em AEF que quando a porcelana está em tração durante o ensaio, a interface também é um local de concentração de tensões de tração (Guazzato et al, 2004c;Hsueh et al, 2008).…”

Section: Comportamento De Crescimento Subcrítico De Trincas -Scgunclassified

“…Outro fator a ser considerado é a presença de tensões residuais na interface induzidas durante o processamento como, por exemplo, as tensões produzidas durante a queima da porcelana (Hsueh et al, 2008).…”

Section: Comportamento De Crescimento Subcrítico De Trincas -Scgunclassified

“…Pode-se dizer que existe uma proporção de 1:1 (porcelana: infraestrutura) na estrutura de duas camadas e de 1:2 na estrutura de três camadas. Um estudo observou que a máxima tensão de tração é transferida da superfície para a interface com o aumento da proporção entre a porcelana e a infra-estrutura (1:2) (Hsueh et al, 2008). Portanto, a distribuição de tensões é diferente nesses dois tipos de corpo-de-prova (duas e três camadas), refletido diretamente no seu padrão de fratura.…”

Section: Comportamento De Crescimento Subcrítico De Trincas -Scgunclassified

See 2 more Smart Citations

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

Borba¹

View full text Add to dashboard Cite

Analytical Model for Prediction of Residual Stress in Zirconia‐Porcelain Bi‐Layer

Allahkarami¹,

Bale²,

Hanan³

2010

Advances in Bioceramics and Porous Ceramics III

View full text Add to dashboard Cite

Analyses of layer-thickness effects in bilayered dental ceramics subjected to thermal stresses and ring-on-ring tests

Cited by 52 publications

References 26 publications

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

Three- to nine-year survival estimates and fracture mechanisms of zirconia- and alumina-based restorations using standardized criteria to distinguish the severity of ceramic fractures

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

Analytical Model for Prediction of Residual Stress in Zirconia‐Porcelain Bi‐Layer

Contact Info

Product

Resources

About