Wear of zirconia/leucite glass-ceramics composites: a chewing simulator study

15/02/2022

Leucite and zirconia are commonly used in the production of prosthetic dental materials. Leucite presents attractive optical properties but low toughness and wear resistance, which limits its use. Zirconia has much higher toughness, but due to aesthetic reasons and ageing issues, needs to be glass veneered. Chipping of such veneer is usually responsible for the abnormal wear induced on the antagonist teeth. Leucite reinforced with 25% of nano-zirconia is a promising alternative to overcome these issues, allowing the production of dental restorations without veneer. This study aims to investigate if leucite-zirconia composites have suitable optical, mechanical and tribological properties to be used in dental restoration. Samples with different compositions of leucite and/or nano-zirconia were produced by unidirectional compression and characterized concerning density, surface morphology, roughness, hardness, toughness, and translucency. Wear tests were performed in a chewing simulator using human cusps as counterbodies. Tests were also performed in glazed zirconia for comparison. 25% ZrO2 leads to the lowest wear of the tribological pair among the studied systems, except 100% ZrO2. This can be attributed to the toughening effect of zirconia and reduced size of third body particles. Abrasion was the main wear mechanism observed in this pair. In addition, this was the composite that presented the highest translucency.

Autores da comunidade :

• 

  A

  Ana Catarina Moreno Branco

  ist169748

  Afiliações e fontes

  IST > CQE

  Centro de Química Estrutural

  IST > DEM

  Departamento de Engenharia Mecânica

• 

  R

  Rogério Anacleto Cordeiro Colaço

  ist13267

  Afiliações e fontes

  IST > DEM

  Departamento de Engenharia Mecânica

  IST > IDMEC

  Instituto de Engenharia Mecânica

  De: scopus

  ID: 2-s2.0-85118872730

• 

  A

  Ana Paula Valagão Amadeu do Serro

  ist134419

  Afiliações e fontes

  IST > CQE

  Centro de Química Estrutural

  IST > DEQ

  Departamento de Engenharia Química

VoR - Versão publicada

Elsevier

https://www.sciencedirect.com/science/article/pii/S0272884221033988

Ceramics International

4604

4613

48

4

10.1016/j.ceramint.2021.10.247

materials-engineering - Engenharia dos Materiais

Palavras-chave

• Leucite
• Zirconia
• Composites
• Chewing simulator
• Tribological behaviour
• Wear

eng - Inglês