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      https://www.ias.ac.in/article/fulltext/boms/037/03/0695-0703

    • Keywords

       

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

    • Abstract

       

      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.

    • Author Affiliations

       

      M Guedes1 2 V Costa3 T Silva3 A Teles3 X Yang3 A C Ferro4 2

      1. Department of Mechanical Engineering, Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal
      2. ICEMS, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal
      3. Escola Superior de Tecnologia, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal
      4. Department of Mechanical Engineering, Instituto Superior Técnico, TU Lisbon, Av. Rovisco Pais, 1049001 Lisboa, Portugal
    • Dates

       
  • Bulletin of Materials Science | News

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