Different Strategies to Bond Bis-GMA-based Resin Cement to Zirconia

作者：Lopes Guilherme Carpena; Spohr Ana Maria; De Souza Grace M^*

来源：Journal of Adhesive Dentistry, 2016, 18(3): 239-246.

DOI：10.3290/j.jad.a36137

• dental ceramic
• zirconia primers
• microshear bond strength
• energy dispersive x-ray spectroscopy
• resin cement
• multimode adhesive

Purpose: To evaluate the effect of different bonding strategies on short- and long-term bis-GMA-based resin cement bond strengths to zirconia.
Materials and Methods: One hundred twenty samples of fully-sintered zirconia (Prettau Zirconia) were sandblasted and randomly distributed into 5 groups (n = 24): UA: Scotchbond Universal Adhesive; SZP: Signum Zirconia Bond I + II; ZPP: Z-Prime Plus; EXP: MZ experimental primer; CO: no primer application ( control). After performing these surface treatments, translucent tubes (0.8 mm diameter and 1.0 mm height) were placed on the zirconia specimens, and bis-GMA-based cement (Duo-Link) was injected into them and light cured. Specimens were tested for microshear bond strength either 24 h or 6 months (m) after water storage (37 degrees C) and surfaces were characterized by SEM and EDX. Two-way ANOVA and Tukey's post-hoc test (p < 0.05) were used to evaluate bond strength results.
Results: The mean bond strengths (MPa +/- SD) were: UA=14.6 +/- 4.7(a) (24 h); 16.0 +/- 4.8(a) (6 m); SZP = 14.0 +/- 5.4(ab) (24 h); 11.9 +/- 2.6(ab) (6 m); ZPP=8.0 +/- 1.8(b) (24 h); 8.6 +/- 3.3(b) (6 m); EXP = 1.2 +/- 0.5(c) (24 h); 0.6 +/- 0.7(c) (6 m); CO=1.0 +/- 1.2(c) (24 h); 1.3 +/- 1.2(c) (6 m). Bonding strategy significantly influenced bond strength (p = 0.0001), but storage time did not (p = 0.841). Groups UA and SZP showed a homogeneous layer covering the zirconia surface. In these groups, EDX demonstrated the presence of phosphorus. Group ZPP resulted in a nonhomogeneous layer, exposing the zirconia substrate underneath. EXP application resulted in an undetectable layer.
Conclusion: Water storage did not affect resin cement bond strengths to zirconia irrespective of the surface treatment. Bis-GMA-based resin cement bond strengths to zirconia are affected by specific bonding strategies.

• 出版日期2016