Glow Discharge Treatment is Anticipated for Applying to a Pretreatment of cp Titanium for Bonding Resin Composites

Abstract

We examined the effect of glow discharge treatment (GDT) on the bonding of resin composites to cp titanium plates (cpTi) by using an experimentally developed device that equipped a power source with high voltage (6.5 kV max) and high frequency (20 kHz). After the chamber was vacuumed at 0.2 Torr, GDT was performed at several treatment times in an argon gas pressure of 0.4 Torr. Since the contact angle of distilled water on cpTi with GDT for a short time decreased significantly, wettability was enhanced by GDT.
The bonding strengths of cpTi to four commercial resin composite systems for crowns and bridges were evaluated by a shear bond test. Although three products increased their bonding strength with GDT, no significant difference appeared between the products with and without GDT. This was because the bonding mechanism of the dental adhesive monomer was influenced by the adsorbed and bonding structures on the bonding surface instead of the wettability itself. These findings suggested that GDT might be useful for application to a pretreatment of cpTi for bonding resin composites, but we need more investigation on treatment conditions of GDT expecting for plasma etching effect.