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http://dx.doi.org/10.4047/jkap.2009.47.1.61

The effect of silane treatment timing and saliva contamination on shear bond strength of resin cement to porcelain  

Ro, Young-Seon (Dentistry, Department of Medical Science, Graduated School, Korea University)
Ryu, Jae-Jun (Department of Medical Science, Graduated School, Korea University)
Suh, Kyu-Won (Department of Medical Science, Graduated School, Korea University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.47, no.1, 2009 , pp. 61-69 More about this Journal
Abstract
Statement of problem: Porcelain veneers have become a popular treatment modality for aesthetic anterior prosthesis. Fitting porcelain veneers in the mouth usually involve a try-in appointment, which frequently results in salivary contamination of fitting surfaces. Purpose: An in vitro study was carried out to investigate the effect of silane treatment timing and saliva contamination on the resin bond strength to porcelain veneer surface. Material and methods: Cylindrical test specimens (n=360) and rectangular test specimens (n=5) were prepared for shear bond test and contact angle analysis. Whole cylindrical specimens divided into 20 groups, each of which received a different surface treatment and/or storage condition. The composite resin cement stubs were light-polymerized onto porcelain adherends. The shear bond strengths of cemented stubs were measured after dry storage and thermocycling (3,000 cycles) between 5 and $55^{\circ}C$. The silane and their reactions were chemically monitored by using Fourier Transform Infrared Spectroscopy analysis (FTIR) and contact angle analysis. One-way analysis of variance (ANOVA) and Dunnett's multiple comparison were used to analyze the data. Results: FT-IR analysis showed that salivary contamination and silane treatment timing did not affect the surface interactions of silane. Observed water contact angles were lower on the saliva contaminated porcelain surface and the addition of 37% phosphoric acid for 20 seconds on saliva contaminated porcelain increased the degree of contact angle. Silane applied to the porcelain, a few days before cementation, resulted in increasing the bond strength after thermocycling. Conclusion: Within the limitation of this study, it can be concluded that it would be better to protect porcelain prosthesis before saliva contamination with silane treatment and to clean the contaminated surface by use of phosphoric acid.
Keywords
Salivary contamination; Silane; Contact angle; Fourier Transform Infrared Spectroscopy analysis (FT-IR);
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