Effect of glow discharge and dielectric barrier discharge plasma as surface treatment on repaired acrylic denture base resin

Abstract

Objective: The purpose of this in-vitro study was to investigate the effect of glow discharge and dielectric barrier discharge (DBD) plasma on repaired acrylic denture base resin as regard to shear bond strength and transverse strength. Materials and methods: Eighty specimens were prepared in this study, 30 for shear bond strength and 50 for transverse strength. Shear bond strength specimens are double fused discs. One disc prepared from heat-cured acrylic resin 15 mm × 3 mm. Glow discharge and DBD plasma with consumed energy of 360 and 720 J were used to treat the specimens. The surface of specimen was wetted with methylmethacrylate. The other disc, prepared from self-cured acrylic resin 6 mm × 2 mm, was attached to that surface as a repair material. Shear bond strength was determined using a universal testing machine. Transverse strength specimens were prepared in dimensions of 65 mm × 10 mm × 2.5 mm. Specimens were fractured, treated with plasma, wetted with methylmethacrylate then repaired. Transverse strength was measured by three-point bending test. Data were analyzed using one-way analysis of variance and Tukey's multiple comparison test interval at 0.05 level of significance. Results: There was a significant difference between the mean values of shear bond strength (MPa) and between the mean values of transverse strength (MPa) of repaired acrylic denture base resin (P Conclusion: Using glow discharge plasma at 720 J as a surface treatment could increase the shear bond strength. Also, using DBD plasma treatment at 360 J could increase the transverse strength.