title: Fluoride release and recharge characteristics of denture base resins containing surface pre-reacted glass-ionomer filler.
abstract: The flexural strength, flexural modulus, and the amount of fluoride released from four experimental denture base resins containing 5, 10, 20 and 30 wt% surface pre-reacted glass-ionomer (S-PRG) filler added to the powder were evaluated. The mean flexural strength of the experimental resins, except the 30 wt%, and the flexural modulus of all the resins, complied with ISO 1567 requirements. In the 20 wt% resin, the amount of fluoride released in the initial phase was 1.88 microg/cm2/day, after which the level decreased. After recharging in a 9000 ppm fluoride solution for eight hours, the level of released fluoride increased markedly to 40.21 microg/cm2/16 hrs. Our results show that fluoride levels increased as a function of the S-PRG filler content. After the almost completely discharged resins were recharged, similar fluoride release occurred again. These results suggest that denture base resins containing S-PRG filler have great recharge and release capabilities which may assist in preventing root caries of abutment teeth.
authors.affiliation: Department of Dental Sociology, Division of Sociological Approach in Dentistry Kanagawa Dental College, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan.
authors.forename: Kazuko
authors.initials: K
authors.lastname: Kamijo
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Mukai
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Tominaga
authors.forename: Izumi
authors.initials: I
authors.lastname: Iwaya
authors.forename: Fukue
authors.initials: F
authors.lastname: Fujino
authors.forename: Yukio
authors.initials: Y
authors.lastname: Hirata
authors.forename: Toshio
authors.initials: T
authors.lastname: Teranaka
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002327:Cariostatic Agents / Q000737:chemistry*; D003819:Denture Bases; D004058:Diffusion; D004337:Drug Carriers / Q000737:chemistry; D055119:Elastic Modulus; D005459:Fluorides / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D010316:Particle Size; D018583:Pliability; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D002327:Cariostatic Agents; D004337:Drug Carriers; C015897:glass ionomer; D014867:Water; D012822:Silicon Dioxide; D019904:Polymethyl Methacrylate; D005459:Fluorides