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Abstract
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.
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Fig. 1.
Veneered zirconia disc (A) was cut into microbars (B) for conducting microtensile bond strength test.
Fig. 2.
Microtensile bond strength test. A: microtensile tester, B: before the test, C: after the test.
Table 1.
Microtensile bond strength value (MPa) of veneering ceramic to zirconia core
Table 2.
Failure type was classified into two groups: cohesive failure in the Lava ceram and mixed failure∗
| Group 1 | Group 2 | |
|---|---|---|
| Failure type | 93% ceramic cohesive | 47% ceramic cohesive |
| 7% mixed | 53% mixed |
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