Effect of Helium/Oxygen Plasma on the Shear Bond Strength of Self-adhesive Resin Cement on Coronal Dentin
Objectives: This study investigated the effects of helium/oxygen plasma on shear bond strength (SBS) when RelyX™ U200 self-adhesive resin cement was applied to coronal dentin, both when the dentin surface was re-wetted and when it was not re-wetted.
Materials and Methods: RelyX™ U200 self-adhesive resin cement was applied to coronal dentin, using the following five methods: dentin surface with no plasma treatment (control group); helium plasma jet (He); helium/oxygen plasma jet (He/O2); helium jet with re-wetting (He+R); and helium/oxygen jet with re-wetting (He/O2+R). The shear bond strength (SBS) was measured 24 hours after bonding. Water contact angles and SEM evaluations of each group, both after surface treatment and of cement/dentin interfaces, were investigated. One-way ANOVA and Sheffe Post Hoc test statistics were used.
Results: Mean SBS values in both groups treated with plasma followed by re-wetting (He+R: 16.25±2.39 and He/O2+R: 18.15±1.93 MPa) were higher than in the plasma-only (He: 13.26±1.52 and He/O2: 12.98±1.94 MPa) and control groups (11.20±1.87 MPa) (p<0.05). The results for the two plasma systems were not significantly different from each other, with or without re-wetting (p>0.05). Water contact angle measurements in all plasma-treated groups showed significantly lower contact angle values. SEM evaluations showed that plasma treatments followed by re-wetting could partially remove the smear layer and open the dentinal tubules, resulting in resin tag formation at the interfaces.
Conclusion: The use of helium/oxygen plasma jet followed by re-wetting enhances the bonding effectiveness of RelyX™ U200 self-adhesive resin cement to coronal dentin.
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