Basic Research on the Rehardening of Demineralized Root Canal Dentin

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  • KIKUCHI Nobuyuki
    Clinical Pathology, Nihon University Graduate School of Dentistry at Matsudo

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  • 軟化根管象牙質の再硬化に関する基礎的研究
  • 第１報：ナノ化ハイドロキシアパタイトの応用による軟化根管象牙質の強化
  • First Report: Strengthening Demineralized Root Canal Dentin by Applying Nano-hydroxyapatite

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The present study aimed to conserve dentin by rehardening demineralized root canal dentin which is completely removed during endodontic and/or prosthetic therapy as a general rule. Numerous previous studies have reported that hydroxyapatite (HA) is highly biocompatible in dentistry, does not hinder the body's healing ability, and possesses the ability to facilitate recalcification and hard tissue guidance. Therefore, HA was used in the present study.<br>As an underlying experiment, demineralized root canal dentin was artificially prepared. Nano-HA was applied to root canals, and subsequent rehardening of demineralized dentin was observed. Furthermore, rehardening was observed in the deep layer of root canal dentin.<br>By allowing nano-HA to act on root canals for a certain period of time, natural dentin strength could be regained, thus suggesting the possibility that demineralized root canal dentin that is removed during prosthetic therapy may be conserved in the future.

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