[Tooth eruption in Jena children in the first phase of mixed dentition].
Based on the process of tooth eruption in children of Jena during the first period of erupting permanent teeth secular changes of the dentition were investigated and the topicality of the current tables for dental age were checked. Mean age of eruption was computed for the individual types of teeth and for each sex in Jena's children and curves for eruption were constructed. On this basis population-specific standards for the dental age were calculated and the children were subdivided into "late, normal or early teether". By comparing the methods for age estimation using the number of teeth or the roentgenological method from Demirjian et al. (1973) it could be shown, that both methods lead to comparable results in the first period of permanent teeth eruption.