Physical and chemical properties of double-layers adhesive polymer film supplemented with 5% NaF

Abstract

Objective: To improve the remineralization effect of fluoride adhesion film, we developed a double-layers adhesive film, and then evaluate its physical properties and fluoride-releasing ability.Methods: The tensile strength, elongation, dissolution rate and fluoride-releasing capacity characteristics of the adhesive films were analyzed.Results: There was no variation in thickness among the adhesive films. The tensile strength was highest in the polyvinyl alcohol (PVA) adhesive film and lowest in the pullulan adhesive film. The elongation rate was highest in pullulan film, followed by PVA-pullulan film and PVA film. Com-pared with the PVA adhesive film, the double-layer adhesive film exhibited higher fluoride ion emission for up to 60 minutes. Adhesive films had greater fluoride ion emission than fluoride varnish after 6 hours of application.Conclusion: The tensile strength and elongation characteristics of double-layer adhesive films were superior to those of single-layer adhesive films. PVA-pullulan double-layer adhesive film had very high initial fluoride ion emission compared with PVA adhesive film and fluoride varnish. This increased fluoride ion emission may compensate for the disadvantages of fluoride varnish and PVA adhesive film. The above results indicate that the PVA-pullulan double-layer adhesive film has improved physical properties and fluoride-releasing capacity compared with conventional PVA adhesive film.