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KMID : 0362120190410020071
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Journal of Technologic Dentistry
2019 Volume.41 No. 2 p.71 ~ p.80
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Effect of yttrium additives on the shear bond strength of porcelain fused to Ni-Cr alloy for porcelain fused metal crown
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Woo Je-Seung
Noh Se-Ra
Noh Hyeong-Rok
Lim Chung-Ha
Lee Jung-Hwan
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Abstract
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Purpose: In this study, to evaluate the effect of oxide changes on the shear bond strength according to the composition of Ni-Cr alloys for porcelain fused matal crown, T-4 alloys, Zeroy alloys and Zeroy-X alloys were selected.
Methods: 20 specimens were fabricated using selected Ni-Cr alloys and porcelain powders. A Ni-Cr alloy having a diameter of 5 ㎜ and a height of 25 ㎜ was produced and the metal surface was polished. Porcelain powder was fired on the polished metal surface to a diameter of 5 mm and a height of 3 mm. The experiment group consisted of three groups, T-4(TNA), Zeroy(ZNA) and Zeroy-X(ZXA).
The fabricated specimens were mounted on a jig of a universal testing machine(UTM) and fracture strength was measured by applying a shear force at a UTM crosshead speed of 0.5 ㎜/min. The fracture strength was calculated as the bond strength between the porcelain and the alloy. The surface of the fractured alloy was analyzed by X-ray diffraction(XRD) and scanning electron microscopy(SEM), and the components of the oxide were measured by energy dispersive X-ray spectroscopy(EDX) line profile method.
Results: In SEM, XRD and EDX analysis, yttrium tended to increase the mechanical and chemical bonding forces. The shear bond strength of ZXA group containing yttrium showed the highest value at 27.53 MPa.
Conclusion: Based on the results of this study, it is considered that the yttrium-added Ni-Cr alloy is clinically acceptable in porcelain shear bond strength.
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KEYWORD
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Ni-Cr alloy, PFM, Shear bond strength, Yttrium
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