Effects of extreme cooling methods on mechanical properties and shear bond strength of bilayered porcelain/3Y-TZP specimens

Objectives: This study investigated the effect of extreme cooling methods on the flexural strength, reliability and shear bond strength of veneer porcelain for zirconia. Methods: Vita VM9 porcelain was sintered on zirconia bar specimens and cooled by one of the following methods: inside a switched-off furnace (slow), at room temperature (normal) or immediately by compressed air (fast). Three-point flexural strength tests (FS) were performed on specimens with porcelain under tension (PT, n = 30) and zirconia under tension (ZT, n = 30). Shear bond strength tests (SBS, n = 15) were performed on cylindrical blocks of porcelain, which were applied on zirconia plates. Data were submitted to one-way ANOVA and Tukey's post hoc tests (p < 0.05). Weibull analysis was performed on the PT and ZT configurations. Results: One-way ANOVA for the PT configuration was significant, and Tukey's test revealed that fast cooling leads to significantly higher values (p < 0.01) than the other cooling methods. One-way ANOVA for the ZT configuration was not significant (p = 0.06). Weibull analysis showed that normal cooling had slightly higher reliability for both the PT and ZT configurations. Statistical tests showed that slow cooling decreased the SBS value (p < 0.01) and showed less adhesive fracture modes than the other cooling methods. Clinical Significance: Slow cooling seems to affect the veneer resistance and adhesion to the zirconia core; however, the reliability of fast cooling was slightly lower than that of the other methods. © 2013 Elsevier Ltd.

Influence of Abutment Type and Esthetic Veneering on Preload Maintenance of Abutment Screw of Implant-Supported Crowns

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Surface agents' influence on the flexural strength of bilaminated ceramics

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Si-based thin film coating on Y-TZP: Influence of deposition parameters on adhesion of resin cement

This study evaluated the influence of deposition parameters for Si-based thin films using magnetron sputtering for coating zirconia and subsequent adhesion of resin cement. Zirconia ceramic blocks were randomly divided into 8 groups and specimens were either ground finished and polished or conditioned using air-abrasion with alumina particles coated with silica. In the remaining groups, the polished specimens were coated with Si-based film coating with argon/oxygen magnetron discharge at 8:1 or 20:1 flux. In one group, Si-based film coating was performed on air-abraded surfaces. After application of bonding agent, resin cement was bonded. Profilometry, goniometry, Energy Dispersive X-ray Spectroscopy and Rutherford Backscattering Spectroscopy analysis were performed on the conditioned zirconia surfaces. Adhesion of resin cement to zirconia was tested using shear bond test and debonded surfaces were examined using Scanning Electron Microscopy. Si-based film coating applied on air-abraded rough zirconia surfaces increased the adhesion of the resin cement (22.78 ± 5.2 MPa) compared to those of other methods (0-14.62 MPa) (p = 0.05). Mixed type of failures were more frequent in Si film coated groups on either polished or air-abraded groups. Si-based thin films increased wettability compared to the control group but did not change the roughness, considering the parameters evaluated. Deposition parameters of Si-based thin film and after application of air-abrasion influenced the initial adhesion of resin cement to zirconia. © 2013 Elsevier B.V. All rights reserved.

Avaliação da deformação, perda de massa e rugosidade das fresas, após osteotomia para implantes osseointegrados, com diferentes tipos de metais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação da resistência á flexão de cerâmicas dentais Y-TZP: efeito de material e espessura

Pós-graduação em Ciências Odontológicas - FOAR

Polimorfismo em medicamentos genéricos e similares

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Modificação de superfícies de zircônia empregada a restaurações sem metais

Pós-graduação em Química - IQ

Crescimento de fibras de zircônia preparadas pela rota sol-gel a partir de moldes de cristal líquido

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Preparação de espuma cerâmica à base de zircônia pelo processo sol-emulsão-gel

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Reação de redução de oxigênio sobre perovskitas La1-xSrxFeyCo1-yO3-δ, para células a combustível de óxido sólido (SOFC)

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Influência da presença de um filme fino de platina na resistência de união titânio-cerâmica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito de tratamentos de superfície sobre a adesão de reparo com resina composta em restarações cerâmicas á base de zircônia Y-TPZ envelhecida hidrotermicamente

Pós-graduação em Reabilitação Oral - FOAR

Efeito de tratamento de superfície na composição de zircônia e na resistência de união com diferentes cimentos

Pós-graduação em Reabilitação Oral - FOAR

Resistência à flexão, resistência à tração diametral e dureza de sistemas cerâmicos para infra-estrutura

Pós-graduação em Reabilitação Oral - FOAR