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A STUDY ON THE THERMAL DIFFUSIVITY AND THERMAL INSULATING EFFECT OF DENTAL CEMENTS

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Abstract

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The purpose of this study was to measure the thermal diffusivity of dental cements
commercially available in Korea and their thermal insulating effect, and the temperature
rise in the pulp chamber simulated to the natural dentition in the mouth.
Twenty three kinds of dental cements were used in this study. Seven of the dental
cements were zinc phosphate cements, seven of them were polycarboxylate cements,
four of them were glass ionomer cements and miscellaneous cements were four kind.
The thermal diffusivity of each cements was measured after 1 and 24 hours after the
start of mixing and compared with each other group. The temperature rise in the pulp
chamber was measured through two discs of 0.5mm dentin and 0.9mm or 1.5mm cement
disc by spraying hot water (55¡É).
From the experiment the following results were obtained :
1. The thermal diffusivity of dental glass ionomer cements was less than that of
dental zinc phosphate cements and polycarboxylate cements.
2. The thermal diffusivity of dental Binc phosphate cements and polycarboxylate
cements measured after 24 hours was more than that of 1 hour.
3. The thermal diffusivity of dental glass ionomer cements measured after 24 hours
was less than that of 1 hour.
4. The thermal insulating effect of dental zinc phosphate cements and polycarboxylate
cements was proportional to the thermal diffusivity in the experimental duration.

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