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KMID : 0362120090310020023
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Journal of Technologic Dentistry
2009 Volume.31 No. 2 p.23 ~ p.30
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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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Park Hang-Min
Chung In-Sung
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Abstract
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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 8mm height and 3mm 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 (MPa) were: 12.93 for aluminium oxide blasting/Rexillium III/IPS e.Max Zirpress; 14.92 for aluminium oxide blasting HF etching/Zirconis core/IPS e.Max Zirpress; 16.37 for aluminium oxide blasting + 9.5% HF etching/Zirconis core/IPS e.Max Zirpress; 12.89 for 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 ( aluminium oxide blasting/Rexillium III) and ZS200EH ( aluminium oxide blasting + 9.5% HF etching/Zirconis core) (p<0.05).
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KEYWORD
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Zirconia core, Rexillium III, Zirliner, IPS e.Max Zirpress, Shear bond strength
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