J Adv Prosthodont.  2013 May;5(2):98-103. 10.4047/jap.2013.5.2.98.

Shear bond strength of resin cement to an acid etched and a laser irradiated ceramic surface

• Kursoglu P
• Motro PF
• Yurdaguven H

• KMID: 2284747
• DOI: http://doi.org/10.4047/jap.2013.5.2.98

Abstract

PURPOSE
To evaluate the effects of hydrofluoric acid etching and Er,Cr:YSGG laser irradiation on the shear bond strength of resin cement to lithium disilicate ceramic.
MATERIALS AND METHODS
Fifty-five ceramic blocks (5 mm x 5 mm x 2 mm) were fabricated and embedded in acrylic resin. Their surfaces were finished with 1000-grit silicon carbide paper. The blocks were assigned to five groups: 1) 9.5% hydrofluoric-acid etching for 60 s; 2-4), 1.5-, 2.5-, and 6-W Er,Cr:YSGG laser applications for 60 seconds, respectively; and 5) no treatment (control). One specimen from each group was examined using scanning electron microscopy. Ceramic primer (Rely X ceramic primer) and adhesive (Adper Single Bond) were applied to the ceramic surfaces, followed by resin cement to bond the composite cylinders, and light curing. Bonded specimens were stored in distilled water at 37degrees C for 24 hours. Shear bond strengths were determined by a universal testing machine at 1 mm/min crosshead speed. Data were analyzed using Kruskal-Wallis and Mann-Whitney U-tests (alpha=0.05).
RESULTS
Adhesion was significantly stronger in Group 2 (3.88 +/- 1.94 MPa) and Group 3 (3.65 +/- 1.87 MPa) than in Control group (1.95 +/- 1.06 MPa), in which bonding values were lowest (P<.01). No significant difference was observed between Group 4 (3.59 +/- 1.19 MPa) and Control group. Shear bond strength was highest in Group 1 (8.42 +/- 1.86 MPa; P<.01).
CONCLUSION
Er,Cr:YSGG laser irradiation at 1.5 and 2.5 W increased shear bond strengths between ceramic and resin cement compared with untreated ceramic surfaces. Irradiation at 6 W may not be an efficient ceramic surface treatment technique.

Keyword

Ceramic; Resin cement; Er,Cr: YSGG Laser; Shear bond strength

MeSH Terms

Adhesives
Carbon Compounds, Inorganic
Ceramics
Collodion
Dental Porcelain
Hydrofluoric Acid
Light
Lithium
Microscopy, Electron, Scanning
Resin Cements
Silicon Compounds
Water
Adhesives
Carbon Compounds, Inorganic
Ceramics
Collodion
Dental Porcelain
Hydrofluoric Acid
Lithium
Resin Cements
Silicon Compounds
Water

Figure

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  Fig. 1 Demostration of the composite cylinder bonding to the ceramic.

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  Fig. 2 The means and the standard deviations of the shear bond strength. Same lowercase letters indicate groups that were not statistically different (P>.05).

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  Fig. 3 Scanning electron microscopic image of hydrofluoric acid etched surface (×1,000 magnification).

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  Fig. 4 Scanning electron microscopic image of 1.5 W laser irradiated surface (×1,000 magnification).

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  Fig. 5 Scanning electron microscopic image of 2.5 W laser irradiated surface (×1,000 magnification).

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  Fig. 6 Scanning electron microscopic image of 6 W laser irradiated surface (×1,000 magnification).

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  Fig. 7 Scanning electron microscopic image of no treated surface (×1,000 magnification).

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