J Korean Acad Prosthodont.  2009 Jan;47(1):61-69. 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 YS
• Ryu JJ
• Suh KW

• KMID: 2000387
• DOI: http://doi.org/10.4047/jkap.2009.47.1.61

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 degrees 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' 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 percent 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.

Keyword

Salivary contamination; Silane; Contact angle; Fourier Transform Infrared Spectroscopy analysis (FT-IR)

MeSH Terms

Cementation
Dental Porcelain
Mouth
Phosphoric Acids
Prostheses and Implants
Resin Cements
Saliva
Spectroscopy, Fourier Transform Infrared
Water
Dental Porcelain
Phosphoric Acids
Resin Cements
Water

Figure

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  Fig. 1. Schematic representation of a strong chemical bond between the dental porcelain and resin composite can be achieved by treatment with a silane coupling agent.

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  Fig. 2. Schematic diagram of the specimens with different surface treatment. Specimen; Sandblasting + Hydrofluoric acid etching.

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  Fig. 3. The FTIR - ATR spectra of the silane with and without saliva contamination. A, 60 seconds after contamination; B, after 24 hour storage in drying condition; C, after 48 hour storage in drying condition; D, after 1 week storage in drying condition.

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  Fig. 4. A, Contact angle data for different surface treatment. B, Contact angle photograph of P3 group. a) silane application, b) saliva contamination after silane application, c) phosphoric acid etching after silane application and saliva contamination.

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  Fig. 5. Shear bond strength data for porcelain after different surface treatment (bar represent standard deviations; n = 18 for each set of data).

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