Comparison of the bond strength of milled and cast Cobalt-Chromium alloys to porcelain

doi:10.3877/cma.j.issn.1674-1366.2016.01.008

Abstract

Abstract:

Objective

To compare the bond strength of milled and cast Cobalt-Chromium (Co-Cr) alloys to porcelain.

Methods

Co-Cr alloy specimens (25 mm × 3 mm × 0.5 mm) were prepared using either a cast or computer numerical control milling methods. An 8 mm × 3 mm × 1.1 mm ceramic layer was fused to the central portion (8 mm × 3 mm) of the surface of the metal specimen. The bond strengths of the metal-ceramic specimens were tested using a three-point bending test according to the ISO 9693 standard. Scanning electron microscopy and energy dispersive spectroscopy were used to determine the morphologies and elemental diffusion, and failure types, and area fraction of adherence porcelain. The data of metal-ceramic bond strength and area fraction of adherence porcelain were analyzed using independent sample t-test (α= 0.05) .

Results

The metal-ceramic bond strength of cast and milled Co-Cr alloy were (31.46 ± 3.61) and (31.74 ± 3.33) MPa, respectively. No statistical difference was found between two groups (t=-0.204, P= 0.738) . After three-point bending test, a mixture of adhesive- and cohesive-failure types was observed in all specimens. The area fraction of adherence porcelain of cast and milled Co-Cr alloy were (0.32 ± 0.06) and (0.45 ± 0.08) , respectively. Significant differences were found between two groups (t=-4.67, P<0.001) , the porcelain-debonded milled alloy surface had larger area of residual ceramic.

Conclusion

No difference was found in the metal-ceramic bond strength between milled and cast Co-Cr alloy.

Key words: Computer-aided milling, Cobalt-chromium alloys, Metal-ceramic bonding, Scan electron microscopy, Electron probe microanalysis

Jieyin Li, Ruinan Li, Lang Liu, Juankun Liao, Xiuhua Ye, Shiyao Lin, Jiantao Ye. Comparison of the bond strength of milled and cast Cobalt-Chromium alloys to porcelain[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2016, 10(01): 45-50.

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Figures/Tables 7

References 28

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组别	试件数	结合强度（MPa，±s）	t值	P值
铸造组	12	31.46 ± 3.61	-0.204	0.738
切削组	12	31.74 ± 3.33	?	?

组别	试件数	结合强度（MPa，±s）	t值	P值
铸造组	12	31.46 ± 3.61	-0.204	0.738
切削组	12	31.74 ± 3.33	?	?

组别	试件数	AFAP(±s)	t值	P值
铸造组	12	0.32 ± 0.06	-4.67	<0.001
切削组	12	0.45 ± 0.08	?	?

组别	试件数	AFAP(±s)	t值	P值
铸造组	12	0.32 ± 0.06	-4.67	<0.001
切削组	12	0.45 ± 0.08	?	?

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