An interpretation of the pattern of tetracycline lines in a deciduous molar.

The growth of human dentine was investigated in an extracted deciduous lower second molar exhibiting more than twentysix tetracycline lines. It was concluded that:1. The pattern of differential growth in lower deciduous molars differs from that in permanent molars.2. These differences are probably due to variations in the pattern of the odontoblast's activity during its life cycle.3. The dentine of the floor of the pulpchamber which constitutes the interradicular dentine grows generally more slowly but steadily than elsewhere.