Shear bond strengths between alumina-toughened zirconia cores and veneering ceramics and their susceptibility to aging

• Published in: Asian Pacific journal of tropical medicine 2012-05, Vol.5 (5), p.402-405
• Main Authors: Zhao, Yong-Qi, Li, Jiang, Zhang, Jing-Chao, Liao, Yun-Mao, Lu, Jun-Jun, Li, Wei
• Format: Article
• Language: English
• Subjects: Aging; Alumina; Aluminum Oxide - standards; bond; ceramics; Ceramics - standards; Dental Veneers - standards; Microscopy, Electron, Scanning; Prosthesis Failure; Saliva, Artificial - pharmacology; Shear; Shear bond strength; Shear Strength; Spectrum Analysis; strength; Veneering; Veneering ceramics; Yttrium - standards; Zirconia; Zirconium - standards
• ISSN: 1995-7645; 2352-4146
• DOI: 10.1016/S1995-7645(12)60067-4

<正>Objective:To evaluate the shear bond strength(SBS) between alumina-toughened zirconia (ATZ) cores and veneering ceramics,investigate the effect of aging in artificial saliva on SBS and compare it with that of yttria-stabilized tetragonal zirconia polycrystals(Y-TZP).Methods:Bars of ATZ and Y-TZP were layered with veneering ceramics in accordance to the recommendation of the manufacturer.Half of each group(n = 10) was aged at 134℃.(under 2 bar pressure) in an autoclave for 48 h.Subsequently,all specimens were subjected to shear force in a universal testing machine.The interface and fractured surface of the specimens were evaluated using scanning electron microscopy and X-ray energy dispersive spectroscopy.Results:The initial mean SBS values in MPa±SD were 28.9±8.0 for ATZ and 26.2±7.6 for Y-TZP.After aging,the mean SBS values for ATZ and Y-TZP were 22.9±4.9 MPa and 22.8±6.9 MPa,respectively.Neither the differences between the SBS values of the ATZ and Y-TZP groups nor the influence of aging on all groups were statistically significant.Conclusions:The SBS between the ATZ core and the veneering ceramics was not affected by aging.The SBS of ATZ to veneering ceramics was not significantly different compared with that of Y-TZP.