Effect of film-forming materials on the fluoride releasing of fluoride varnishes

WANG Jia-qiong; ZHAO Xin-yi; GU Lin-juan; LI Shi-bao; LI Zhi-hua

Abstract：AIM: To evaluate the influence of film-forming materials on the fluoride releasing characteristics of the varnishes. METHODS: Five fluoride varnishes containing the same fluoride and different film-forming materials (osmotic acrylic resin,Copal resin,polymerized rosin,polyvinyl butyral,ethylmethacrylate copolymer resins respectively) were prepared. Each fluoride varnish was painted onto 35 plastic slices (12 mm × 12 mm × 0.4 mm),which were then immersed in deionized water after drying. After 4 h,8 h,24 h,48 h,72 h,96 h and 120 h,five slices of each fluoride varnish were removed and the water were tested for fluoride content with a fluoride-ion selective electrode.RESULTS:Within 8h,the fluoride varnish containing osmotic acrylic resin showed the highest fluoride releasing rate,followed by the fluoride varnishes containing Copal resin or polyvinyl butyral. The fluoride varnish containing polymerized rosin or ethyl methacrylate copolymer showed the least fluoride releasing rate. At 72 h,the fluoride varnish containing Copal resin demonstrated the highest fluoride releasing rate,followed by the fluoride varnishes containing osmotic acrylic resin or ethyl methacrylate copolymer or polyvinyl butyral. The fluoride varnish containing polymerized rosin showed the least fluoride releasing rate. CONCLUDION: Film-forming materials have significant influence on the fluoride-releaseing characteristics of fluoride varnish. Osmotic acrylic resin,Copal resin and polyvinyl butyral are suitable for fluoride varnishes.