Apparent Heats of Wetting and Heats of Reaction of the Components of Tooth Structure and Synthetic Fluorapatite

The apparent heats of wetting (ΔH W ) and heats of reaction (ΔH R ) of ground dentin, enamel, anorganic tooth, and synthetic fluorapatite of known specific surface were determined calorimetrically. Values of ΔH W in water were affected by the presence of collagenous matter. Reactions at the surface were caused mainly by organic groups, since the ΔH R values for anorganic tooth, enamel, and fluorapatite were much smaller when exposed to reagents.