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KMID : 0362420010390020157
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Journal of Korean Academy of Prosthodontics
2001 Volume.39 No. 2 p.157 ~ p.170
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A STUDY ON THE SHEAR BOND STRENGTH BETWEEN NONPRECIOUS METAL SURFACE AND RESIN CEMENT ACCORDING TO THE VARIOUS SURFACE TREATMENT METHODS
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Ryu Young-Ryeol
Lim Ju-Hwan
Cho In-Ho
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Abstract
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The bond strength is the most important factor in establishing long-term success of resin-retained fixed prostheses. So, various surface treatment methods have been introduced to improve the bond strength of metal surface and bonding resin till now. This study was performed to compare the effect of silicoating with that of metal primer and analyze the correlation between treatment time of sandblasting and the bond strength, so that meant to find more effective surface treatment method that could enhance the bond strength of resin-retained fixed prostheses. The surfaces of all specimens made of Verabond(R)alloys were air-abraded with 250micrometer Al2O3 according to treatment time of sandblasting and they were subdivided to be treated with only sandblasting (S group), silicoating following sandblasting (SS group), and metal primer application after sandblasting (SM group). Then pairs of metal specimens (10mm x h 2mm, 6 x h 2mm) were bonded with Super bond C&B(R). The specimens were stored in 38 degrees C water for 48 hours and shear bond strength was measured using the universal testing machine. The results were as follows ; 1. In the comparison of shear bond strength according to treatment time of sandblasting, bond strength was increased in the order of 0", 15", 30", 45", 60" group. 0" group had significantly lower value than any other, while 0", 15" group were significantly different with 30", 45", 60" group (p<0.05). 2. In the comparison of shear bond strength according to surface treatment methods, bond strength was increased in the order of S group, SS group and SM group. S group was significantly different with SS group and SM group (p<0.05). 3. Observing the mode of bond failure, 0", 15" group showed only adhesive failure, and 30", 45", 60" group did mostly adhesive & cohesive failure in S group. In SS group and SM group, all other groups except 0", 15" group showed mostly cohesive failure. From the above results, its is considered that sandblasting should be treated for more than 30 seconds, and metal primer be more effective and available clinically than silicoater system which is complicate, technique-sensitive and time-consuming method, when nonprecious metal surface is planning to be treated with in order to enhance the bond strength of resin-retained fixed prostheses.
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KEYWORD
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Surface treatment, Shear bond strength, Nonprecious metal, Resin cement
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