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KMID : 0362420110490020114
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Journal of Korean Academy of Prosthodontics
2011 Volume.49 No. 2 p.114 ~ p.119
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Effect of specimen preparation method on the microtensile bond strength of veneering ceramic to zirconia
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Kim Ki-Youn
Yeo In-Sung
Kim Sung-Hun
Han Jung-Suk
Lee Jai-Bong
Yang Jae-Ho
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Abstract
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PURPOSE: 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 (1×1×7 mm3) using a low speed diamond disc under water cooling (n = 15). The specimen of group 2 was cut into microbars (1.2×1.2×7 mm3) in the same way. Whereafter the microbars were trimmed (1×1×7 mm3) using a thick diamond disc under water cooling (n = 15). The microtensile bond strength was tested in a microtensile tester (Instron 8848, Instron? Co., Norwood, USA). Fractured microtensile specimens were analyzed under a stereomicroscope (MZ6, Leica Microsystems GmbH, Wetzlar, Germany) at magnification ×30.
RESULTS: The microtensile bond strength of group 1 (28.8 ± 7.0 MPa) was significantly higher than group 2 (11.0 ± 3.3 MPa) (P=.00).
CONCLUSION: It appears advisable to avoid the trimming action, especially high strength ceramic specimens.
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KEYWORD
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Zirconia, Microtensile bond strength, Trimming
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