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Monkey pulp reactions to restorative materials.

P B Hörsted, A M Simonsen, M J Larsen

    Scandinavian Journal of Dental Research
    |April 1, 1986
    PubMed
    Summary
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    Unlined composite fillings caused more inflammation in monkey teeth than lined fillings or other materials. Bacteria in unlined cavities were linked to severe pulp inflammation, a correlation persisting after 90 days.

    Area of Science:

    • Dental Materials Science
    • Restorative Dentistry
    • Pulp Biology

    Background:

    • Dental composites are widely used for tooth restorations.
    • Understanding their interaction with dental pulp is crucial for clinical success.
    • Pulp inflammation can result from various restorative materials and techniques.

    Purpose of the Study:

    • To evaluate pulp reactions to different dental filling materials in deep cavities.
    • To assess the role of bacteria in pulp inflammation associated with these materials.
    • To compare lined versus unlined composite restorations.

    Main Methods:

    • Deep cavities in monkey teeth were filled with light-cured composite (lined/unlined), chemically cured composite (lined), silicate cement, or zinc oxide-eugenol cement.

    Related Experiment Videos

  • Acid etch technique and resin bonding were used for composite restorations.
  • Pulp reactions and bacterial presence were examined at 8 and 90 days.

    • Main Results:

    • Unlined composite fillings showed more pronounced inflammation at 8 days compared to lined composites and silicate cement.
    • Bacteria were present in all unlined cavities, strongly correlating with moderate to severe pulp inflammation.
    • After 90 days, mild inflammation was observed across all groups, with a persistent link between bacteria and inflammation.

    Conclusions:

    • Lining composite restorations may mitigate early pulp inflammation.
    • Bacterial ingress into unlined cavities is a significant factor in pulp irritation.
    • Long-term monitoring reveals persistent associations between bacterial presence and inflammatory responses in dental restorations.