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Cavity remaining dentin thickness and pulpal activity.

Peter E Murray1, Imad About, Philip J Lumley

  • 1Indiana University School of Dentistry, Indianapolis 46202, USA. petmurra@iupui.edu

American Journal of Dentistry
|June 21, 2002
PubMed
Summary

Remaining dentin thickness (RDT) significantly impacts pulp healing and odontoblast survival after cavity preparation. Optimal reactionary dentin formation occurs with RDT between 0.5-0.25 mm, with material choice also playing a role.

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Area of Science:

  • Dental materials science
  • Restorative dentistry
  • Pulp biology

Background:

  • Pulpal injury and repair are critical concerns in restorative dentistry.
  • Understanding the relationship between remaining dentin thickness (RDT) and pulp response is essential for clinical success.

Purpose of the Study:

  • To evaluate pulpal injury and dentin repair activity based on RDT.
  • To assess the influence of different restorative materials on these responses.

Main Methods:

  • Histomorphometric analysis of odontoblast numbers and reactionary dentin area in 217 human teeth.
  • Cavities were restored with various materials (composite, glass-ionomer, zinc oxide-eugenol, calcium hydroxide).
  • Teeth were extracted at 20-381 days post-operatively for analysis.

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Main Results:

  • Maximal reactionary dentin deposition occurred with RDT between 0.5-0.25 mm.
  • Calcium hydroxide and composite materials showed greater reactionary dentin repair than others.
  • Odontoblast numbers were maintained with RDT > 0.25 mm, while closer proximity to the pulp caused injury.

Conclusions:

  • RDT is a crucial factor in predicting pulp healing and odontoblast survival.
  • The selection of restorative material influences the extent of pulp repair and odontoblast preservation.
  • Clinical decisions regarding cavity preparation depth should consider these findings to optimize pulpal health.