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Mono or polycrystalline alumina-modified hybrid ceramics.
Kaizer, Marina R; Gonçalves, Ana Paula R; Soares, Priscilla B F; Zhang, Yu; Cesar, Paulo F; Cava, Sergio S; Moraes, Rafael R.
Afiliação
  • Kaizer MR; Graduate Program in Dentistry, Federal University of Pelotas, Brazil; School of Materials Engineering, Federal University of Pelotas, Brazil.
  • Gonçalves AP; Graduate Program in Dentistry, Federal University of Pelotas, Brazil.
  • Soares PB; Graduate Program in Dentistry, Federal University of Uberlândia, Brazil.
  • Zhang Y; College of Dentistry, New York University, USA.
  • Cesar PF; School of Dentistry, University of São Paulo, Brazil.
  • Cava SS; School of Materials Engineering, Federal University of Pelotas, Brazil.
  • Moraes RR; Graduate Program in Dentistry, Federal University of Pelotas, Brazil. Electronic address: moraesrr@gmail.com.
Dent Mater ; 32(3): 450-60, 2016 Mar.
Article em En | MEDLINE | ID: mdl-26754431
OBJECTIVES: This study evaluated the effect of addition of alumina particles (polycrystalline or monocrystalline), with or without silica coating, on the optical and mechanical properties of a porcelain. METHODS: Groups tested were: control (C), polycrystalline alumina (PA), polycrystalline alumina-silica (PAS), monocrystalline alumina (MA), monocrystalline alumina-silica (MAS). Polycrystalline alumina powder was synthesized using a polymeric precursor method; a commercially available monocrystalline alumina powder (sapphire) was acquired. Silica coating was obtained by immersing alumina powders in a tetraethylorthosilicate solution, followed by heat-treatment. Electrostatic stable suspension method was used to ensure homogenous dispersion of the alumina particles within the porcelain powder. The ceramic specimens were obtained by heat-pressing. Microstructure, translucency parameter, contrast ratio, opalescence index, porosity, biaxial flexural strength, roughness, and elastic constants were characterized. RESULTS: A better interaction between glass matrix and silica coated crystalline particles is suggested in some analyses, yet further investigation is needed to confirm it. The materials did not present significant differences in biaxial flexural strength, due to the presence of higher porosity in the groups with alumina addition. Elastic modulus was higher for MA and MAS groups. Also, these were the groups with optical qualities and roughness closer to control. The PA and PAS groups were considerably more opaque as well as rougher. SIGNIFICANCE: Porcelains with addition of monocrystalline particles presented superior esthetic qualities compared to those with polycrystalline particles. In order to eliminate the porosity in the ceramic materials investigated herein, processing parameters need to be optimized as well as different glass frites should be tested.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Porcelana Dentária / Óxido de Alumínio Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Porcelana Dentária / Óxido de Alumínio Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido