Determination of thermal properties of impression materials.
Residual strains are important for dimensional accuracy of impression materials. When these strains are being calculated, knowledge of thermophysical constants is needed. This paper describes determination of thermal diffusivity, thermal conductivity, specific heat, heat of polymerization rate, and total heat of polymerization. The first two constants mentioned were obtained from an experiment in which transient heat conductivity was studied. The evaluation was based on an analytical solution of this problem. The remaining constants were derived by means of standard differential scanning calorimetry, DSC. Results from accurate, cost-efficient methods are given for three silicones and one polyether.
Pamenius
M
M
Department of Dental Materials and Technology, The Karolinska Institute, Huddinge, Sweden.
Ohlson
N G
NG
D002151:Calorimetry; D003760:Dental Impression Materials / Q000737:chemistry*; D003799:Dental Stress Analysis; D004987:Ethers / Q000737:chemistry; D006358:Hot Temperature; D008422:Materials Testing; D012826:Silicone Elastomers / Q000737:chemistry; D013814:Thermal Conductivity
D003760:Dental Impression Materials; D004987:Ethers; D012826:Silicone Elastomers