Abstract
The purpose of this investigation was to evaluate cephalometrically the mechanisms of class II malocclusion cases treated with a Bionator for a period of 20 to 24 months. Before treatment and after treatment skull films of centric occlusion were analyzed.
The results were as follows.
1) The cephalometric findings after treatment showed a favorable relationship between the results of the skeletal and dental changes.
2) The changes with skeletal and dental problems which contributed to class II malocculusion resulted in a lingual improvement of the incisor.
3) There were 2 directions of mandibular growth using a Bionator. One was a downward movement and the other was a downward and forward movement.
