Abstract
A general peak of the enzyme activities was observed in the odontoblasts and ameloblasts at the onset of the matrix formation in dentine (insemination day 19) and enamel (insemination day 21). The changes in the intracellular distribution of stains with increased differentiation of the internal dental epithelium are emphasized. Similarities and dissimilarities between these findings and changes observed with the electron microscope in mitochondrial localization in the cells are discussed. The staining reactions indicated similar distributions of lactate, malate and glucose-6-phosphate dehydrogenase activities. The last enzyme, however, showed only a weak activity with the histochemical technique employed. Possible unspecific staining reactions and theories of common metabolic functions of some dental tissues are discussed.
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