Influence of Primers and Additional Resin Layer on Zirconia Repair Bond Strength

Abstract

Purpose

To evaluate the influence of alloy/zirconia primer and 10‐methacryloyloxydecyl dihydrogen phosphate (MDP)‐containing resin layer treatments on the shear bond strength (SBS) of composite resin to zirconia after aging.

Materials and Methods

Sixty zirconia (Y‐TZP) blocks were air‐abraded (35‐μm Al₂O₃) and divided into 6 experimental groups (n = 10) in terms of primer/resin layer as follows: 1) control, without any primer or resin; 2) AP, Alloy Primer; 3) ZPP, Z‐Prime Plus; 4) PL/ZPP, Z‐Prime Plus with light polymerization; 5) AP+SEB, Alloy Primer along with light‐cured bonding resin of a self‐etch adhesive system (SE Bond); and 6) ZPP+SEB, Z‐Prime Plus with SE Bond. After composite resin placement and light polymerization, the specimens were stored in distilled water (37°C for 4 months) and thermal‐cycled for 6000 cycles. The SBS was tested with a universal testing machine. Statistical analysis of the SBS data was performed with one‐way ANOVA, followed by HSD Tukey test (α = 0.05).

Results

There were significant differences between the groups (p < 0.001, F = 116.5). All the groups revealed significantly higher SBS than the control (p < 0.001). ZPP+SEB group exhibited the highest SBS (16.14 ± 2.52 MPa) and AP group the lowest SBS (7.00 ± 1.97 MPa) among experimental groups; both had significant differences with the other groups (p < 0.001). There were no significant differences between ZPP, PL/ZPP and AP+SEB groups (p > 0.05).

Conclusions

The bond strength between zirconia ceramic and composite resin was affected by different primers/resin layer. Applying an MDP‐containing resin layer along with both primers resulted in significant enhancement of SBS. This improvement for Z‐Prime Plus was significantly higher than that of Alloy Primer.

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