Release and Recharge of Fluoride by Restorative Materials

Toshiyuki Itota, Mimiko Okamoto, Kohei Sato, Satoshi Nakabo, Michihiro Nagamine, Yasuhiro Torii, Kiyoshi Inoue

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


This study investigated the release and recharge of fluoride by restorative materials. Resin-modified glass ionomers (RGIs), polyacid-modified composite resins (PMCRs) and resin composite containing fluoride were used for comparison of fluoride release. Non-fluoride-releasing resin composite was used as a control. The amounts of fluoride release from RGIs and PMCRs remarkably increased in the citrate-phosphate acid buffer compared with distilled water. The amounts of fluoride recharged in RGIs increased with the concentration of NaF solution, but those of PMCRs exposed to all concentrations of NaF solutions were less than 1.5 ppm. Neither resin composite containing fluoride and non-fluoride-releasing resin composite gave any evidence of recharge. RGIs and PMCRs affected by acid buffer solution could not recharge much fluoride even if they were immersed in the 1000 ppmF NaF solution. The results suggested that the matrix of RGIs and PMCRs functioned as a reservoir of fluoride, but the functions were lost by acid attack.

Original languageEnglish
Pages (from-to)347-353
Number of pages7
JournalDental materials journal
Issue number4
Publication statusPublished - 1999


  • Fluoride release
  • Recharge
  • Restorative material

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)


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