Abstract
Pulpotomies were performed in the premolars of 11 dogs and pulpectomies in the premolars of 35. The pulp chambers or root canals were filled with a paste containing 11% lead tetroxide and the tissues of the vital organs were analysed for lead concentrations from one week to 24 months. The post-treatment lead concentrations in both groups were approximately equal to or less than those of control dogs with one exception: the spleen in the pulpectomized group at six months showed a significant increase in lead concentrations.
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