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Related Experiment Videos

Thermal conductivity through various restorative lining materials.

Peter A G Little1, David J Wood, Nigel L Bubb

  • 1Division of Restorative Dentistry, Leeds Dental Institute, Leeds LS2 9LU, UK.

Journal of Dentistry
|July 12, 2005
PubMed
Summary
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Dental cavity lining materials vary significantly in thermal conductivity. The study found that dentine bonding systems (DBS) offer superior thermal insulation compared to traditional zinc-oxide eugenol cement (ZNOE).

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Traditional dental practice often uses thick zinc-oxide eugenol cement (ZNOE) linings for thermal shock protection.
  • The necessity and efficacy of thermal insulation by cavity liners require scientific evaluation.

Purpose of the Study:

  • To quantify and compare heat transfer through four dental lining materials and dentine.
  • To assess the thermal insulation properties of traditional and contemporary cavity lining materials.

Main Methods:

  • An in vitro study utilizing a Lees' Disc apparatus to measure heat transfer.
  • Thermal conductivity was calculated for zinc oxide eugenol cement (ZNOE), calcium hydroxide paste (CAOH), resin modified glass polyalkenoate (RMGP), and dentine bonding system (DBS).

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  • Statistical analysis included one-way ANOVA and Tukey's post hoc tests.

    • Main Results:

    • Thermal conductivity order (ascending): DBS < CAOH < RMGP < DENTINE < ZNOE.
    • DBS exhibited significantly lower thermal conductivity than RMGP, DENTINE, and ZNOE.
    • CAOH showed significantly lower thermal conductivity than DENTINE and ZNOE.

    Conclusions:

    • Thermal insulation is not a primary factor for selecting cavity lining materials.
    • Material selection should prioritize other criteria beyond thermal insulation properties.