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Related Experiment Videos

Thermal conductivity of cement base materials

J L Drummond1, J Robledo, L Garcia

  • 1Department of Restorative Dentistry, University of Illinois, Chicago.

Dental Materials : Official Publication of the Academy of Dental Materials
|January 1, 1993
PubMed
Summary

This study evaluated dental cements

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Minimizing temperature changes in dental restorations is crucial for pulp vitality.
  • Understanding the thermal properties of various dentin-cement-restorative systems is essential for clinical success.

Purpose of the Study:

  • To determine the most effective dentin-cement-restorative material system for minimizing temperature fluctuations from thermal stimuli.
  • To compare the thermal insulation properties of zinc oxide and eugenol (ZOE), zinc phosphate (ZP), glass ionomer (GI), and zinc polycarboxylate (ZPC) cements.

Main Methods:

  • Extracted human molar teeth with standardized Class I preparations were used.
  • Remaining dentin thickness varied (0.5 mm, 1.0 mm, 2.0 mm).
  • Cements (0.5 mm, 1.5 mm) and restorative materials (amalgam, composite) were tested under hot (58°C) and cold (4°C) conditions using thermocouples.

Main Results:

  • For heated specimens without restorative material, ZOE was least effective; for cold, ZOE was most effective.
  • When amalgam was used, ZOE and GI were most effective for cold, while all cements were similar for heat except ZOE (least effective).
  • For composite restorations, all tested cements and dentin thicknesses provided identical thermal insulation for both hot and cold stimuli.

Conclusions:

  • The choice of cement and restorative material significantly impacts thermal insulation, particularly under direct thermal insult.
  • Glass ionomer and zinc oxide eugenol show promise for thermal management in specific restorative scenarios.
  • Further research into composite resin thermal behavior is warranted, as it appears to equalize thermal effects across different cements.

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