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The Influence of Surface Treatments on Shear Bond Strength between Zirconia Core and Heat Press Ceramic Interface

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The Influence of Surface Treatments on Shear Bond Strength between Zirconia Core and Heat Press Ceramic Interface

Hang-Min Park, In-Sung Chung

Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan, Busan 609-757

All-ceramic restorations have gained acceptance among clinicians and patients because of their superior esthetics.

Most all-ceramic systems have a 2-layer structure, using a weak veneering ceramic over a strong supporting core.

often, failure of all-ceramic restorations occurs when the veneering ceramic fractures, exposing the core material.

The purpose of this study was to compare the shear bond strength of heat press ceramic system (Zirpress) to zirconia core with various surface treatments.

10 metal cores and 50 zirconia cores were fabricated and divided into six groups according to surface treatment such as Zirliner application, aluminium oxide blasting, and 9.5% HF etching.

Sixty specimens were prepared using Zirpress, veneered 8 height and 3 in diameter, over the zirconia cores (n=10). The shear bond strength test was performed in a universal testing machine with a crosshead speed of 1 /min. Ultimate shear bond strength data were analyzed with One-way ANOVA and the Scheffe’s test (p=.05).

Within the limits of this study, the following conclusions were drawn:

The mean shear bond strengths ( ) were: 12.93 for 110 aluminium oxide blasting/Rexillium /IPS e.Max Zirpress; 14.92 for 50 aluminium oxide blasting + 9.5% HF etching/Zirconis core/IPS e.Max Zirpress; 16.37 for 110 aluminium oxide blasting + 9.5% HF etching/Zirconis core/IPS e.Max Zirpress; 12.89 for 200 aluminium oxide blasting + 9.5% HF etching/Zirconis core/IPS e.Max Zirpress; 19.30 for 9.5% HF etching/Zirconis core/IPS e.Max Zirpress; 19.55 for Zirliner/Zirconis core/IPS e.Max Zirpress. The mean shear bond strength for ZNTZH (Zirliner/Zirconis core) and ZNTEH (9.5% HF etching/Zirconis core) were significantly superior to MS110H (110 aluminium oxide blasting/Rexillium ) and ZS200EH (200 aluminium oxide blasting + 9.5% HF etching/Zirconis core) (p<0.05).

[Abstract]

Key word : Zirconia core, Rexillium , Zirliner, IPS e.Max Zirpress, Shear bond strength

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