Abstract
ObjectiveThis study was conducted to investigate the effect of subpressure on the bond strength of resin to zirconia ceramic. The subpressure would create a pressure gradient which could clean out the bubbles in the adhesives or bonding interface.MethodsTwenty-eight pre-sintered zirconia discs were fabricated. Half of them were polished (group P, n = 14), and the rest were sandblasted (group S, n = 14). After sintered,the surface roughness of the zirconia discs was measured. Then, they were randomly divided into two subgroups (n = 7). The groups were named as follows: PC: P + no additional treatments; PP: P + 0.04 MPa after application of adhesives; SC: S + no additional treatments; and SP: S + 0.04 MPa after application of adhesives. Resin columns were bonded to the zirconia specimens to determine shear bond strength (SBS). The bonding interfaces were observed and the fracture modes were evaluated. Statistical analysis was performed on all data.ResultsThe surface roughness of group S was significantly higher than that of group P (P<0.05). The SBS values were PC = 13.48 ± 0.7 MPa, PP = 15.22 ± 0.8 MPa, SC = 17.23 ± 0.7 MPa and SP = 21.68 ± 1.4 MPa. There were significant differences among the groups (P<0.05). Scanning electron microscopy (SEM) results showed that the adhesives of group SP and PP were closer and denser to the zirconia ceramic than that of group PC and SC. The proportion of the mixed fracture mode significantly increased after adding subpressure (P< 0.05).ConclusionSubpressure can improve the shear bond strength of resin to zirconia ceramics and increase micro-infiltration between the adhesives and the zirconia ceramics, especially on the rough surfaces.
Highlights
Scanning electron microscopy (SEM) results showed that the adhesives of group SP and PP were closer and denser to the zirconia ceramic than that of group PC and SC
With the increasing demand for esthetics in prosthodontic treatments, various all-ceramic restorations have been widely used in clinical settings [1]
The surface roughness values of group P and S were 0.92 ± 0.81 μm and 3.13 ± 1.01 μm, respectively, and there was a significant difference between them (P
Summary
With the increasing demand for esthetics in prosthodontic treatments, various all-ceramic restorations have been widely used in clinical settings [1]. The conventional cementation techniques do not provide an adequate level of bond strength for the zirconia [9]. This is because etching with hydrofluoric acid and silanization had no positive effects on the zirconia bonding due to its resistance to acids and the absence of silicon oxide [10]. Many surface treatments have been used to improve the bond strength of resin to zirconia ceramics over the past two decades, including air abrasion [11], diamond burs abrasion [12], silica (tribochemical) coating [13], silicoating [14, 15],selective infiltration etching [16] and laser [17, 18]. Wei et al [27] suggested that a high pressure blowing method could improve the adhesion of resin to dentin
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