Fatigue behavior of Y-TZP ceramic after surface treatments

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• 作者：Marina Amaral^a ; ^{marinamaral_85@yahoo.com.br" class="auth_mail" title="E-mail the corresponding author} ; Paulo Francisco Cesar^b ; ^{paulofc@usp.br" class="auth_mail" title="E-mail the corresponding author} ; Marco Antonio Bottino^a ; ^{mmbottino@uol.com.br" class="auth_mail" title="E-mail the corresponding author} ; Ulrich Lohbauer^c ; ^{ulrich.lohbauer@fau.de" class="auth_mail" title="E-mail the corresponding author} ; Luiz Felipe Valandro^d ; ^{lfvalandro@hotmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Zirconia ceramic ; Fatigue ; Surface treatments ; Strength ; Weibul analysis
• 刊名：Journal of the Mechanical Behavior of Biomedical Materials
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：57
• 期：Complete
• 页码：149-156
• 全文大小：917 K

文摘

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 µm silica particles). Profilometric and phase transformation analyses were performed. Disks were submitted to biaxial flexural strength (BFS) before and after mechanical cycling (100 N, 2×10⁶ cycles) and staircase approach (n=20). The flexural fatigue limits (FFLs) were obtained at 10², 10³, 10⁴ and 10⁵ 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.