Examination of bond strength and mechanical properties of Y-TZP zirconia ceramics with different surface modifications

Abstract

The purpose of our study was to evaluate the effects of surface modifications on the bond strength between veneering porcelains and Yttria-stabilized tetragonal zirconia (Y-TZP). In a bond strength tests, the effect of control, 70 µm alumina-sandblasting, 30 µm and 110 µm silica-coating of the Y-TZP surface on bonding were evaluated with veneering porcelains. In addition, the effect of surface modification on the flexural strength of Y-TZP was also evaluated. The data was analyzed using one-way ANOVA and Tukey test. All specimens showed bond strength values in excess of 25 MPa, the minimum allowed by ISO9693. In addition, significantly differences were found between the control and the 30 µm silica-coated. On the other hand the flexural strength of Y-TZP does not significantly difference for any surface modification. These results indicate that silica-coating may provide an effective pre-treatment for this enhancement of the bond strength while maintaining the strength of Y-TZP.

Effect of surface treatments on the bond strength between resin cement and differently sintered zirconium-oxide ceramics

“…Zirconium-oxide is a polymorphic material and has three allotropes; monoclinic, tetragonal and cubic. The monoclinic phase is stable from room temperature to 1170 8C, tetragonal in 1170-2370 8C and cubic phase exist over 2370 8C up to melting point of 2680 8C [3,[5][6][7][8]. In order to obtain more stable and stronger tetragonal zirconia in room temperature, small amounts of stabilizing oxides (Y 2 O 3 or CeO 2 ) use to control the tetragonal (t) to monoclinic (m) phase transformation and take advantages of the transformation-toughening [7][8][9].…”

“…With the widespread use of computer-aided design/ computer-assisted manufacture (CAD/CAM) technology, it was possible to produce more stable and strong zirconia ceramic substructures for complete coverage single crown and FPD's [5][6][7]10]. Two types of zirconia milling processes are currently available: soft-milling (partially sintered state) and hard-milling (full sintered).…”

“…This transformation is associated with 3-4% volume expansion that induces compressive stresses and making zirconia a potentially superior material compared with other dental ceramics. The tetragonal form of zirconia in room temperature is ''metastable'' and some external stresses factors like sandblasting, grinding, impact or thermal aging can initiate the tetragonal to monoclinic phase transformation [5][6][7][8].…”

In vitro short-term bonding performance of zirconia treated with hot acid etching and primer conditioning etching and primer conditioning

“…To promote micromechanical interlocking, many surface roughening methods for Y-TZP were developed, such as alumina sandblasting, laser etching, selective infiltration etching, application of micro porcelain pearls or glaze layer, and coating with nano-structured alumina [3][4][5][6][7][8] . However, high residual internal stress and thermal stress engendered by these surface roughening processes caused microcracks to form and phase changes to occur, thereby reducing the mechanical properties of Y-TZP 9,10) . A new surface modification method for Y-TZP, hot HCl/Fe2Cl3 etching, was developed by Casucci et al 11,12) .…”

The Influence of Different Resin Cements and Pretreatments on the Bond Strength between Zirconia and Cement

“…The approaches of surface treatment for zirconia ceramics were discussed, the inuence of which was not certain [4,5].…”