Fatigue behavior of Y-TZP ceramic after surface treatments

Autor(es)

Amaral, Marina ^[1] ; Cesar, Paulo Francisco ^[2] ; Bottino, Marco Antonio ^[1] ; Lohbauer, Ulrich ^[3] ; Valandro, Luiz Felipe ^[4]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Sch Dent, Dept Dent Mat & Prosthesis, Ave Eng Franscisco Jose Longo, Sao Jose Dos Campos - Brazil

^[2] Univ Sao Paulo, Sch Dent, Dept Dent Mat, Ave Prof Lineu Prestes 2227, Sao Paulo - Brazil

^[3] Univ Erlangen Nurnberg, Dent Clin Operat Dent & Periodontol 1, Lab Biomat Res, Gluedstr 11, Erlangen - Germany

^[4] Univ Fed Santa Maria, Prosthodont Unit, Sch Dent, Dept Restorat Dent, Rua Marechal Floriano Peixoto 1184, BR-97015372 Santa Maria, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 57, p. 149-156, APR 2016.
• Citações Web of Science: 15

Resumo

Objectives: The aim of this study was to evaluate the effect of three surface treatments on the biaxial flexural strength before and after mechanical cycling, and fatigue limit of a Y-TZP ceramic. Methods: Disc-shaped specimens were produced and three surface conditions were tested: CT (as-sintered, untreated), GL (thin layer of porcelain glaze), and AA (air abrasion with 30 mu m silica particles). Profilometric and phase transformation analyses were performed. Disks were submitted to biaxial flexural strength (BFS) before and after mechanical cycling (100 N, 2 x 10(6) cycles) and staircase approach (n=20). The flexural fatigue limits (FFLs) were obtained at 10(2), 10(3), 10(4) and 10(5) cycles. Results: Tetragonal to monoclinic transformation was only observed for AA group (9.46% of monoclinic phase). Glazed group presented the highest Ra values. Flexural strength was higher for AA group; CT and GL groups were similar. The reliability was similar between groups. The mechanical cycling at 100 N did not affected flexural strength. FFLs were higher for AA group, and the three surface treatments presented decrease in strength according to the increase in number o cycles. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/20077-0 - Influência de dois tratamentos de superfície para cerâmicas a base de zircônia na resistência adesiva e no comportamento à fadiga do material
• Beneficiário: Marina Amaral
• Modalidade de apoio: Bolsas no Brasil - Doutorado