Low temperature degradation of single layers of multilayered zirconia in comparison to conventional unshaded zirconia: Phase transformation and flexural strength J Mech Behav Biomed Mater.
Epub Sep 8. Electronic address: swille proth.
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DOI: Additionally, the ball-on-three-balls test was compared with a conventional biaxial flexural strength test. The biaxial flexural strength was examined with a piston-on-three-ball test and a ball-on-three-balls test.
Results: There was a significant difference of the ratio of transformation with respect to the tested materials, also between the four different layers of multilayered zirconia. After 20h of hydrothermal aging the single kiel ratio of monoclinic phase ranged from 9.
However, hydrothermal aging had no significant influence on the flexural strength of any material. Furthermore, the flexural strength measured by the ball-on-three-balls test was higher than that measured by the piston-on-three-ball test.
Both test methods provide reliable results. However, as the ball-on-three balls test is less dependent on surface roughness, it might be preferred for investigations adapted to clinical reality.
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Keywords: Biaxial flexural strength; Phase transformation; Shading particles; zirconia. All rights reserved. MeSH terms.