Processing and characterization of alumina/LAS bioceramics for dental applications

Bulletin of materials science

M Guedes²  A Teles¹  A C Ferro³  T Silva¹  V Costa¹  X Yang¹ 

[1] Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal$$Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, PortugalEscola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal$$;Department of Mechanical Engineering, Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal$$ICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$Department of Mechanical Engineering, Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, PortugalDepartment of Mechanical Engineering, Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal$$ICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$ICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, PortugalDepartment of Mechanical Engineering, Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal$$ICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$;ICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$Department of Mechanical Engineering, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$ICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, PortugalICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$Department of Mechanical Engineering, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$Department of Mechanical Engineering, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, PortugalICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$Department of Mechanical Engineering, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal$$

关键词: Dental materials;    alumina;    aluminosilicates;    LAS glass-ceramics;    indentation toughness;    biological stability.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Alumina allows to recreate the functionality and aesthetics of natural teeth. However, its low fracture toughness rises concern regarding use in dental restoration. Structural reliability is addressed here by formulating a material containing alumina and a glass�?�ceramic from LAS system. The presence of LAS in the mixtures result in formation of glass phase during sintering, promoting densification at lower temperature and enhanced surface finishing. A composite microstructure with increased toughness can thus be produced. Powder mixtures containing 0, 20, 50, 80 and 100 wt\%-LAS were prepared by planetary milling and uniaxial pressing and sintered. The compositions were investigated regarding their processability, mechanical performance and biological behaviour. Aesthetics was evaluated by comparison with a commercial dental matching guide. Variations on hardness and fracture toughness with starting LAS fraction were assessed by indentation. Interaction with biological medium was evaluated by immersion in a simulated body fluid. Resulting microstructures were characterised by FEG�?�SEM, EDS and XRD.

【 授权许可】

Unknown