J Adv Prosthodont.  2011 Dec;3(4):221-228. 10.4047/jap.2011.3.4.221.

Influence of surface modification techniques on shear bond strength between different zirconia cores and veneering ceramics

• Mosharraf
• Rismanchian M
• Savabi O
• Ashtiani A

• KMID: 2054757
• DOI: http://doi.org/10.4047/jap.2011.3.4.221

Abstract

PURPOSE
Veneering porcelain might be delaminated from underlying zirconia-based ceramics. The aim of this study was the evaluation of the effect of different surface treatments and type of zirconia (white or colored) on shear bond strength (SBS) of zirconia core and its veneering porcelain.
MATERIALS AND METHODS
Eighty zirconia disks (40 white and 40 colored; 10 mm in diameter and 4 mm thick) were treated with three different mechanical surface conditioning methods (Sandblasting with 110 microm Al2O3 particle, grinding, sandblasting and liner application). One group had received no treatment. These disks were veneered with 3 mm thick and 5 mm diameter Cercon Ceram Kiss porcelain and SBS test was conducted (cross-head speed = 1 mm/min). Two and one way ANOVA, Tukey's HSD Past hoc, and T-test were selected to analyzed the data (alpha=0.05).
RESULTS
In this study, the factor of different types of zirconia ceramics (P=.462) had no significant effect on SBS, but the factors of different surface modification techniques (P=.005) and interaction effect (P=.018) had a significant effect on SBS. Within colored zirconia group, there were no significant differences in mean SBS among the four surface treatment subgroups (P=0.183). Within white zirconia group, "Ground group" exhibited a significantly lower SBS value than "as milled" or control (P=0.001) and liner (P=.05) groups.
CONCLUSION
Type of zirconia did not have any effect on bond strength between zirconia core and veneer ceramic. Surface treatment had different effects on the SBS of the different zirconia types and grinding dramatically decreased the SBS of white zirconia-porcelain.

Keyword

Dental materials; Surface Properties; Dental Bonding; Zirconium; Ceramics; Dental Porcelains

MeSH Terms

Ceramics
Dental Bonding
Dental Materials
Dental Porcelain
Humans
Surface Properties
Zirconium
Ceramics
Dental Materials
Dental Porcelain
Zirconium

Figure

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  Fig. 1 Adjustable Plexiglas mold for condensing the veneering ceramic and prepared specimens for SBS test.

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  Fig. 2 SEM micrographs of liner application subgroup in colored zirconia group after shear bond strength testing (original magnification × 1000).

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  Fig. 3 SEM micrographs of ground subgroup in white zirconia group after shear bond strength testing (original magnification × 1000).

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