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http://dx.doi.org/10.4047/jkap.2011.49.2.114

Effect of specimen preparation method on the microtensile bond strength of veneering ceramic to zirconia  

Kim, Ki-Yeon (Department of Prosthodontics, School of Dentistry, Seoul National University)
Yeo, In-Sung (Department of Prosthodontics, School of Dentistry, Seoul National University)
Kim, Sung-Hun (Department of Prosthodontics, School of Dentistry, Seoul National University)
Han, Jung-Suk (Department of Prosthodontics, School of Dentistry, Seoul National University)
Lee, Jai-Bong (Department of Prosthodontics, School of Dentistry, Seoul National University)
Yang, Jae-Ho (Department of Prosthodontics, School of Dentistry, Seoul National University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.49, no.2, 2011 , pp. 114-119 More about this Journal
Abstract
The aim of this study was to investigate effect of specimen preparation method on the microtensile bond strength of veneering ceramic to zirconia core. Materials and methods: Cylindrical Lava zirconia block (3M ESPE, Seefeld, Germany) was cut into discs using a diamond disc. After sintering, the core specimens were placed in an adjustable mold and veneered with Lava ceram (3M ESPE, Seefeld, Germany). The disc shaped specimen of group 1 was cut into microbars ($1{\times}1{\times}7\;mm^3$) using a low speed diamond disc under water cooling (n = 15). The specimen of group 2 was cut into microbars ($1.2{\times}1.2{\times}7\;mm^3$) in the same way. Whereafter the microbars were trimmed ($1{\times}1{\times}7\;mm^3$) using a thick diamond disc under water cooling (n = 15). The microtensile bond strength was tested in a microtensile tester (Instron 8848, $Instron^{(R)}$ Co., Norwood, USA). Fractured microtensile specimens were analyzed under a stereomicroscope (MZ6, Leica Microsystems GmbH, Wetzlar, Germany) at magnification ${\times}30$. Results: The microtensile bond strength of group 1 ($28.8{\pm}7.0\;MPa$) was significantly higher than group 2 ($11.0{\pm}33\;MPa$) (P=.00). Conclusion: It appears advisable to avoid the trimming action, especially high strength ceramic specimens.
Keywords
Zirconia; Microtensile bond strength; Trimming;
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