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Efficacy of polyphasic calcium phosphates as a direct pulp capping material.

Wakako Kiba1, Satoshi Imazato, Yusuke Takahashi

  • 1Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, Suita, Japan.

Journal of Dentistry
|July 10, 2010
PubMed
Summary
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Polyphasic calcium phosphates (Poly-CaP) effectively promote dentin regeneration and sealing for direct pulp capping. This advanced material enhances hard tissue formation, offering a promising alternative for vital pulp therapy.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Regenerative Dentistry

Background:

  • Polyphasic calcium phosphates (Poly-CaP), a composite of hydroxyapatite (HAp) and soluble calcium phosphates, promote osteoblast activity and hard tissue formation.
  • The dual-phase nature of Poly-CaP, with soluble calcium phosphates and an insoluble HAp phase, suggests potential for pulp capping applications by promoting dentin regeneration and surface sealing.

Purpose of the Study:

  • To evaluate the efficacy of Poly-CaP as a direct pulp capping material.
  • To assess Poly-CaP's calcium release profile, in vivo dentinogenesis induction, and adhesive bonding capabilities.

Main Methods:

  • Calcium release from Poly-CaP and HAp was measured in buffer solutions at pH 7.4 and 4.0.
  • Direct pulp capping was performed on rat molars using Poly-CaP or HAp, followed by histopathological evaluation of dentin bridge formation and inflammation.

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  • Adhesive systems were bonded to the HAp surface of Poly-CaP, and the interface was examined using SEM.

    • Main Results:

    • Poly-CaP demonstrated significantly higher continuous calcium release compared to HAp under both pH conditions.
    • In vivo studies showed a significantly higher rate of complete dentin bridge formation with Poly-CaP compared to HAp.
    • SEM analysis revealed successful resin impregnation and intimate contact at the bonding interface between adhesives and the HAp surface of Poly-CaP.

    Conclusions:

    • Poly-CaP shows significant potential as a direct pulp capping material.
    • Its ability to promote dentin bridge formation and provide a tight seal with adhesives makes it advantageous for vital pulp therapy.