Effects of two sizes of sandblasting on the metal-ceramic bonding strength of palladium-silver alloy

doi:10.3877/cma.j.issn.1674-1366.2015.01.006

Abstract

Abstract:

Objective

To investigate the effect of size of sandblasting on metal-ceramic bonding strength of Pd-Ag alloy.

Methods

The surface roughness (Ra) and contact angle of Pd-Ag alloy surface were evaluated after using the different sizes of Al₂O₃ (250, 120 μm) in 0.3 MPa air pressure to rough the alloy surface. The bond strengths were evaluated using a three-point bend test according to ISO 9693. The data of surface roughness, surface contact angle, and metal-ceramic bonding strength between two groups were analyzed using independent sample t-test (α= 0.05) . Scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) was used to evaluate microscopic features and elemental compositions.

Results

The mean surface roughness was 2.03 μm and the contact angle was 46.02° for sandblasted with 250 μm Al₂O₃ particles. Sandblasted with 250 μm Al₂O₃ provided rougher surface and better surface wettability than sandblasted with 120 μm Al₂O₃. The mean bonding strength of 250 μm sandblasting and 120 μm sandblasting group were (51.61 ± 5.91) and (46.62 ± 4.33) MPa, respectively. There was a statistically significant difference between two groups (t=2.360, P=0.028) . Mixture of adhesive and cohesive fracture modes were observed from fracture surfaces of all specimens.

Conclusion

Sandblasted with 250 μm Al₂O₃ obtain higher bond strengths than 120 μm in 0.3 MPa air pressure.

Key words: Sandblasting size, Surface roughness, Contact angle, Metal-ceramic bonding strength

Jiantao Ye, Bohua Li, Jieyin Li, Xiqian Wang, Lu Wang, Xiuhua Ye. Effects of two sizes of sandblasting on the metal-ceramic bonding strength of palladium-silver alloy[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2015, 09(01): 37-43.

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Figures/Tables 7

References 30

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组别	试件数	Ra（μm）	接触角（θ°）
250 μm喷砂组	5	2.03 ± 0.23	46.02 ± 2.06
120 μm喷砂组	5	1.69 ± 0.30	63.61 ± 1.95

组别	试件数	Ra（μm）	接触角（θ°）
250 μm喷砂组	5	2.03 ± 0.23	46.02 ± 2.06
120 μm喷砂组	5	1.69 ± 0.30	63.61 ± 1.95

组别	试件数	结合强度（MPa）
250 μm喷砂组	12	51.61 ± 5.91
120 μm喷砂组	12	46.62 ± 4.33

组别	试件数	结合强度（MPa）
250 μm喷砂组	12	51.61 ± 5.91
120 μm喷砂组	12	46.62 ± 4.33

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