Effects of a coating resin containing S-PRG filler to prevent demineralization of root surfaces

Sai Ma, Satoshi Imazato, Ji Hua Chen, Gen Mayanagi, Nobuhiro Takahashi, Takuya Ishimoto, Takayoshi Nakano

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


The purpose of this study was to evaluate the ability of a coating material containing the surface pre-reacted glass-ionomer (S-PRG) filler to protect the root from demineralization in vitro. The proprietary coating resin containing the S-PRG filler (PRG Barrier Coat) was applied to human root dentin and immersed in acid buffer at pH 4.5 for 3 d. Demineralization was evaluated by micro-CT scanning and the dentin-material interface observed by scanning electron microscopy. The ability of the coating resin to modify acid production by Streptococcus mutans was investigated by monitoring pH using an ion-sensitive field-effect transistor pH electrode. Application of PRG Barrier Coat produced a coating layer with the thickness of approximately 200 μm and completely inhibited demineralization. The bacteria-induced pH fall at the material surface was significantly inhibited. We conclude that S-PRG fillercontaining coating resin may be an effective material for protecting exposed root from both chemical and biological challenges.

Original languageEnglish
Pages (from-to)909-915
Number of pages7
JournalDental Materials Journal
Issue number6
Publication statusPublished - 2012


  • Demineralization
  • Resin coating
  • Root caries
  • S-PRG


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