A Versatile Radiometer For Infrared Emission Measurements Of the Atmosphere And Targets

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Abstract
A summary is given of several aspects of work required to evaluate the laser for a wide variety of preventive dentistry applications. Results for studies to determine maximum pulpal temperatures following laser absorption indicate that quite high energies can be tolerated by the enamel. Also, measurements of the hemispherical reflectance of tooth enamel show values near 50% in the visible region, diminishing to more desirable values in the near infrared. Initial experimental and theoretical studies for uptake enhancement of topically applied fluorides are also described briefly. Results of the theoretical model indicate that significant enhancement of uptake with heating is due to the increase of the diffusion coefficient with temperature. Experiments indicate an increase of uptake with heating, but some unusual characteristics are yet to be described. Lastly, inorganic materials development for possible durable pit and fissure sealants is touched upon here. While direct apatite sintering on the tooth does not appear promising because of the high temperatures required, thermosetting phosphate bonded sealants and liquid phase sintering may hold the answer.

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