[Elasto-orthodontic system--a development of the positioner].

A clear classification of the various types of elasto-appliances is necessary in order to understand the indications of such appliances. The elasto-finisher, for example, is used over brackets left in situ after the completion of multibracket therapy whilst the elasto-aligner is placed over specially placed buttons. The elasto-orthodontic system and the indications for the four different types of appliances are presented together with typical case examples. The basic principle of the positioner construction to determine the treatment objectives, namely the set-up, is also essential for the construction of elasto-appliances. The differences between the conventional positioner and elasto-appliances are describe in detail.