Microstructure and nanoindentation analyses of low-temperature aging on the zirconia-porcelain interface. (February 2017)

• Record Type: Journal Article
• Authors: Peng, M.D.; Wei, J.Q.; Wang, Y.N.; Li, Q.
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 66(2017)
• Page Start: 119
• Page End: 126
• Publication Date: 2017-02
• Subjects: Zirconia-based restorations -- Low-temperature aging -- Zirconia-porcelain interface -- Nanoindentation -- Flexural strength; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2016.11.010
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: The aim of the present study was to investigate the effects of low-temperature aging on the micro-mechanical and micro-structural properties of zirconia-porcelain interface. In total, thirty-three Y-TZP zirconia blocks were fabricated by using CAD/CAM technology, veneered with porcelains. Specimens were submitted to low-temperature aging in an autoclave at 134 °C, additional 0.2 MPa pressure for 0 h, 5 h, or 10 h. Flexural strength was obtained by using three-point bending test. Micro-mechanical properties (nano-hardness (H) and reduced modulus ( E r )) were investigated by nanoindentation tests. Scanning electron microscopy and X-ray diffraction analyses were performed to identify the micro-structure and fracture behavior. The flexure strength, modulus and hardness of zirconia increased after 5 h aging and decreased after 10 h aging. No significant alterations of the reduced modulus or hardness of porcelain were detected in the whole aging duration. Width of the zirconia-porcelain interface was extended towards the bulk of zirconia. The detachment and cracks could be observed in zirconia, and the crystal alignment was disorganized in porcelain after 5 h aging and 10 h aging. Mechanical properties of the veneering porcelain are not affected by low-temperature aging. However, the expansion and the alterations of micro-mechanical and micro-structural properties of zirconia-porcelain interface were detected.