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KMID : 0362120190410030177
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Journal of Technologic Dentistry
2019 Volume.41 No. 3 p.177 ~ p.185
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Comparison of Shear Bonding Strength of Laminate Veneer by Lithium Disilicate Ceramics and Surface Treatment Methods
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Park Sang-Joon
Chung In-Sung
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Abstract
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Purpose: This study was to investigate the effect of three different surface treatments on the shear bond strength of lithium disilicate ceramics to enamel.
Methods: Totally 60 lithium disilicate ceramic disc specimens were fabricated with IPS e.max press (Ivoclar Vivadent, Schaan, Liechtenstein) and Mazic Claro (Vericom, Korea). 30 specimens in each lithium disilicate ceramic were assigned to 3 groups of the each following surface treatment: 1) 50㎛ airborne particle abrasion+silane, 2) 9.5% hydroflouric acid etching (HF)+silane, 3) 50㎛ airborne particle abrasion+9.5% HF+silane. Lithium disilicate ceramic surfaces after surface treatments were AFM examined. The shear bond strength was measured in a universal testing machine at 0.5mm/min crosshead speed. All data were analyzed using a two-way ANOVA and Tukey’s test(α=0.05).
Results: The mean surface roughness of lithium disilicate ceramics ranged from 0.178㎛ to 0.441㎛. The mean shear bond strengths ranged from 23.81±2.78 MPa to 33.99±4.85 MPa.
Conclusion: 1. Mazic Claro showed higher shear bond strength than IPS e.max press at 3 different surface treatments, and no statistically significant was observed. 2. The shear bond strength of IPS e.max press was strongly enhanced as surface treated with 50㎛ airborne particle abrasion and 9.5% hydroflouric acid etching. And there was no statistical significance at the shear bond strength of Mazic Claro with surface treatments.
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KEYWORD
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lithium disilicate, surface treatments, shear bond strength, enamel
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