Influence of nonthermal argon plasma on the shear bond strength between zirconia and different adhesives and luting composites after artificial aging

Abstract

PURPOSEPlasma activation of hydrophobic zirconia surfaces might be suitable to improve the bond strength of luting materials. The aim of this study was to analyze the influence of nonthermal argon-plasma on the shear bond strength (SBS) between zirconia and different combinations of 10-MDP adhesive systems and luting composites after artificial aging.MATERIALS AND METHODSTwo hundred forty Y-TZP specimens were ground automatically with 165 µm grit and water cooling. Half of the specimens received surface activation with nonthermal argon-plasma. The specimens were evenly distributed into three groups according to the adhesive systems ([Futurabond U, Futurabond M, Futurabond M + DCA], VOCO GmbH, Germany, Cuxhaven) and into further two subgroups according to the luting materials ([Bifix SE, Bifix QM], VOCO GmbH). Each specimen underwent artificial aging by thermocycling and water storage. SBS was measured in a universal testing machine. Statistical analysis was performed using ANOVA and Scheffè procedure with the level of significance set to 0.05.RESULTSSurface activation with nonthermal plasma did not improve the bond strength between zirconia and the tested combinations of adhesive systems and luting materials. The plasma-activation trended to reveal higher bond strength if the self-etch luting material (Bifix SE) was used, irrespective of the adhesive system.CONCLUSIONPlasma-activation seems to be suitable to improve bond strength between zirconia and self-etch resin materials. However, further research is necessary to identify the influence of varying plasma-parameters.

Influence of Non-Thermal Atmospheric Pressure Plasma Treatment on Shear Bond Strength between Y-TZP and Self-Adhesive Resin Cement

“…Irrespective of the cement type, the SBS values of the NTP group were significantly lower in thermocycling than non-thermocycling. These results are consistent with previous reports of a significant decrease in SBS due to thermocycling after NTP treatment [23,25,38]. Therefore, the SBS after NTP treatment may be affected by thermal stress, the compositions of resin cement, and low resistance to hydrolysis of the van der Waals bond [39,40].…”

“…Some articles also have mentioned that this mechanical surface treatment can improve the bond strength between zirconia and various types of cement [29,30]. In contrast, several studies have shown that the microporosity created by sandblasting can act as a cracking agent to worsen the long-term stability of zirconia-based restorations [4,7,22,25]. Additionally, He et al [31] have also been mentioned that the remaining Al 2 O 3 particles after sandblasting could degrade the adhesion, requiring the cleaning of the surface.…”

“…These activated plasma species produce a reactive surface without significantly changing the bulk properties of the materials [22,23]. The plasma treatment has also been applied to the dental field and can be a suitable method for increasing zirconia adhesion [24,25]. Previous studies have compared the effects of sandblasting and non-thermal atmospheric pressure plasma (NTP) on shear bond strength (SBS) between Y-TZP and resin cement [26,27].…”

Influence of Non-Thermal Atmospheric Pressure Plasma Treatment on Retentive Strength between Zirconia Crown and Titanium Implant Abutment

“…In addition, NTP generation equipment is not only inexpensive but also low in maintenance costs [ 31 ]. This NTP processing has been introduced to dentistry and may be an effective tool for increasing the RS of the zirconia crown [ 33 , 34 ].…”

“…Several articles have reported the effect of NTP on shear bond strength or microtensile bond strength between zirconia and resin cement [ 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. However, there is currently no study on the RS between NTP-treated zirconia crown and titanium implant abutment through resin cement.…”