Effect of pH variation on the subcritical crack growth parameters of glassy matrix ceramics

Autor(es)

Melo, Renata M. ^[1] ; Pereira, Cristiane ^[2] ; Ramos, Nathalia C. ^[1] ; Feitosa, Fernanda A. ^[3] ; Dal Piva, Amanda M. O. ^{[4, 1, 5]} ; Tribst, Joao Paulo M. ^{[4, 1, 5]} ; Oezcan, Mutlu ^[6] ; Jorge, Antonio O. C. ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Inst Sci & Technol, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos - Brazil

^[2] Sao Paulo State Univ Unesp, Inst Sci & Technol, Dept Biosci & Oral Diag, Sao Jose Dos Campos - Brazil

^[3] Sao Paulo State Univ UNESP, Inst Sci & Technol, Dept Restorat Dent, Sao Jose Dos Campos - Brazil

^[4] Vrije Univ, Gustav Mahlerlaan 3004, NL-1081 LA Amsterdam - Netherlands

^[5] Univ Amsterdam, Dept Dent Mat Sci, Acad Ctr Dent Amsterdam ACTA, Gustav Mahlerlaan 3004, NL-1081 LA Amsterdam - Netherlands

^[6] Univ Zurich, Ctr Dent & Oral Med, Dent Mat Unit, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Zurich - Switzerland

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Applied Ceramic Technology; v. 16, n. 6, p. 2449-2456, NOV 2019.
• Citações Web of Science: 1

Resumo

The goals of our study were to calculate the subcritical crack growth (SCG) parameters of two veneering ceramics stored in water or Streptococcus mutans (S. mutans) biofilm and remineralizing medium, with indentation flaws. Feldspar (VM7) and leucite-reinforced (VM13) glass ceramic disks (Vita Zahnfabrik, Bad Sackingen, Germany) were made according to ISO 6872. Some specimens were indented with a Vickers diamond and the crack dimensions were measured. The specimens were fractured for a calculation of inert strength or further stored in water or submitted to pH variation, under preloading tension. Finally, the SCG parameters were calculated after the specimens were fractured under four stressing rates (MPa/s). Weibull analysis was conducted on non-indented specimens. XPS was performed as qualitative analysis. The subcritical crack of leucite ceramic did not vary with the media storage, but the glass-ceramic experienced a retarded growth after pH variation. The materials presented low Weibull modulus. Qualitative elemental analyses showed chemical modification on both ceramics. Therefore, the crack growth of leucite-reinforced ceramic was less affected by the environment pH than glass-ceramic. (AU)

• Processo FAPESP: 10/50450-4 - Efeitos do biofilme, do pH e da fadiga sobre o crescimento sub-critico de trincas e microestrutura de cerâmica odontológicas
• Beneficiário: Antonio Olavo Cardoso Jorge
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/50030-8 - Efeitos do biofilme, do ph e da fadiga sobre o crescimento subcritico de trincas e microestrutura de ceramicas odontologicas
• Beneficiário: Renata Marques de Melo Marinho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado