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Microstructural and crystallographic surface changes after grinding zirconia‐based dental ceramics
Author(s) -
Denry I. L.,
Holloway J. A.
Publication year - 2006
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.30382
Subject(s) - cubic zirconia , materials science , tetragonal crystal system , microstructure , grinding , monoclinic crystal system , polishing , ceramic , annealing (glass) , diamond , residual stress , composite material , metallurgy , crystal structure , crystallography , chemistry
The purpose of this study was to evaluate microstructural and crystallographic phase changes after grinding 3Y‐TZP dental ceramics. Ceramic blanks were sintered according to manufacturer's recommendations and divided into four groups: (A) as‐sintered control, (B) diamond‐ground manually under water, (C) ground and polished, and (D) ground and annealed at 1000°C for 1 h. Bulk specimens were analyzed by X‐ray diffraction to characterize the crystalline phases. The microstructure was investigated by SEM. XRD analyses showed that the control group and the group that was ground and annealed contained only tetragonal zirconia. However, after grinding or after grinding followed by polishing, rhombohedral zirconia and strained tetragonal zirconia were present, without any detectable amount of monoclinic zirconia. Annealing led to the disappearance of both residual lattice strain and the rhombohedral phase. The microstructure of the ground and polished specimens was characterized by significant residual surface damage associated with grain pullout to a depth of about 20 μm. This type of damage could have an impact on the long‐term fatigue behavior of 3Y‐TZP. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2006