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Journal of Dental Research
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Thermal Diffusivity of Glass-ionomer Cements

W.M. Tay

Dental School, The London Hospital Medical College, Turner Street, London E1 2AD, England

M. Braden

Dental School, The London Hospital Medical College, Turner Street, London E1 2AD, England

Thermal diffusivity, a property related to the thermal insulative efficiency of a material, was measured in nine glass-ionomer cements and compared with results from a silicate and a polycarboxylate cement. Each cement was mixed at various powder-liquid ratios (P/L) and moulded into a rectangular prism of approximate dimensions 2 cm cube with a thermocouple embedded in it. The prism was immersed in a constant-temperature bath at 1°C, and the fall in temperature was observed over a period of three min. Except for the initial and later stages, the plot of the logarithmic difference between external and internal temperatures of each block of cement against time showed a straight line in accord with theoretical prediction. From the slope, the thermal diffusivity of the material was calculated. The values for the silicate, polycarboxylate, and glass-ionomer-metal (cermet) showed a marked rise with increasing P/L, whereas at higher P/L, glass ionomer cements showed gradual change, with values being only slightly higher than the thermal diffusivity of dentin. Glass-ionomer cements are good thermal insulators over a wide range of PIL, and close agreement between experimental and theoretical data shows that glass-ionomer cements are homogeneous isotropic materials.

Journal of Dental Research, Vol. 66, No. 5, 1040-1043 (1987)
DOI: 10.1177/00220345870660051001
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