[Revision of the "prognosis of supporting structures in the second dentition" after Trankmann and Raufmann]

A prognose of the support zone of the permanent dentition, introduced by Tränkmann and Raufmann in 1983, has been investigated. The results of the investigations confirm fundamentally the correlations set up by the authors. It is pointed at restrictions in connection with the reliability of these method of prognose.