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Pulp response to Streptococcus mutans.

R C Paterson1, S K Pountney

  • 1University of Glasgow, Scotland.

Oral Surgery, Oral Medicine, and Oral Pathology
|September 1, 1987
PubMed
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Infection from Streptococcus mutans in exposed rat molar pulps led to significant pulp necrosis within 7 days. Dentine bridge formation was minimal, indicating poor healing response to this oral bacteria.

Area of Science:

  • Oral biology
  • Microbiology
  • Dental research

Background:

  • Dental caries is a major global health issue.
  • Streptococcus mutans is a key etiological agent in dental caries.
  • Understanding pulp response to bacterial challenge is crucial for endodontic treatment.

Purpose of the Study:

  • To investigate the pulpal response to Streptococcus mutans infection in a germ-free rat model.
  • To evaluate the progression of pulp necrosis and dentine bridge formation over time.

Main Methods:

  • Maxillary molar pulps of germ-free rats were mechanically exposed.
  • Streptococcus mutans was applied to pulp wounds.
  • Animals were observed for 2, 7, and 28 days post-exposure.
  • Histological analysis assessed pulp response, necrosis, and dentine bridge formation.

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Main Results:

  • Minimal pulpal response observed at 2 days.
  • Early pulp necrosis detected by day 7, without inflammatory infiltration.
  • Extensive pulp necrosis present by 28 days.
  • Dentine bridge formation occurred in less than 25% of specimens.

Conclusions:

  • Streptococcus mutans infection rapidly induces pulp necrosis in exposed rat molars.
  • The germ-free environment and bacterial challenge resulted in a limited capacity for pulp repair.
  • This model highlights the aggressive nature of S. mutans on exposed dental pulps.