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Low‐temperature degradation of a Y‐TZP ceramic after surface treatments
Author(s) -
Amaral Marina,
Valandro Luiz Felipe,
Bottino Marco A.,
Souza Rodrigo O. A.
Publication year - 2013
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.32957
Subject(s) - cubic zirconia , materials science , autoclave , flexural strength , grinding , monoclinic crystal system , composite material , abrasion (mechanical) , phase (matter) , surface roughness , ceramic , surface finish , profilometer , diamond , metallurgy , chemistry , crystal structure , crystallography , organic chemistry
The purpose of this study was to evaluate the influence of zirconia surface treatments on low‐temperature degradation (LTD). Disc‐shaped specimens were subjected to one of four surface treatments, denoted as C (control—no surface treatment), Si (air abrasion with 30 µm silica‐modified alumina particles), Al (air abrasion with 30 µm alumina particles), and Gr (grinding with 120 grit diamond discs). Half of the samples were submitted to autoclave treatment for 12 h (127°C, 1.5 bar). Samples were characterized by x‐ray diffraction and profilometer analysis and were subjected to biaxial flexural strength test. All of the groups exhibited an increase in the amount of monoclinic phase (m‐phase) after LTD. The t→m transformation was remarkable for the specimens from the C group, which also exhibited a significant increase in strength. The Gr group also exhibited an increase in strength but lower initial roughness, which probably suppressed LTD on the zirconia surface. The specimens subjected to air abrasion exhibited higher initial amounts of m‐phase and a small increase in m‐phase after LTD; the strength was not affected in these groups. The effects of LTD were different with each surface treatment applied. Apparently, LTD may be suppressed by smoother surfaces or the presence of an initial amount of m‐phase on zirconia surface. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 101B: 1387–1392, 2013.