Thermal diffusivity measurements of dental resin using photoacoustic effect

The laser induced non-destructive photoacoustic technique has been employed to measure the thermal diffusivity of dental resin. The thermal diffusivity value was evaluated by knowing the transition frequency between the thermally thin to thermally thick region from the log-log plot of photoacoustic amplitude versus chopping frequency. Analysis of the data was carried out on the basis of the one-dimensional model of Rosencwaig and Gersho. The present investigation reveals that amount of monomer has great influence on the propagation of heat carriers and hence on the thermal diffusivity value.