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pH values of pulp-capping agents.

K Ida, T Maseki, M Yamasaki

    Journal of Endodontics
    |August 1, 1989
    PubMed
    Summary
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    Pulp capping agents with calcium hydroxide were tested for pH. Five agents were neutralized by dentin, but three maintained a high pH, potentially impacting pulp healing.

    Area of Science:

    • Dentistry
    • Biomaterials Science
    • Dental Pulp Biology

    Background:

    • Calcium hydroxide is a widely used material in dental pulp capping procedures.
    • The pH of pulp capping agents is crucial for their biological effects and clinical success.
    • Limited data exists on the actual pH levels of commercial calcium hydroxide-based pulp capping agents when in contact with dentin.

    Purpose of the Study:

    • To evaluate and compare the pH values of eight commercially available pulp capping agents containing calcium hydroxide.
    • To determine if the dentin-enamel junction neutralizes the high pH of these agents.
    • To identify agents that may maintain a high pH after application, potentially affecting pulp tissue response.

    Main Methods:

    • Eight different pulp capping agents containing calcium hydroxide were selected.

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  • pH measurements were performed on each agent.
  • The agents were then applied to a dentin substrate to simulate clinical conditions.
  • Post-application pH levels were re-evaluated to assess neutralization by the dentin wall.

    • Main Results:

    • Five of the eight tested pulp capping agents showed a significant reduction in pH, indicating neutralization by the dentin.
    • Three of the eight agents, however, did not reach a neutral pH and retained a significantly alkaline level.
    • The specific agents that were and were not neutralized by dentin were identified.

    Conclusions:

    • The neutralizing capacity of dentin varies among different calcium hydroxide-based pulp capping agents.
    • Three tested agents may pose a risk of excessive alkalinity to the dental pulp due to incomplete pH neutralization.
    • Further investigation into the clinical implications of non-neutralized high-pH agents on pulp healing is warranted.