Influence of premolar extraction or non-extraction orthodontic therapy on the angular changes of mandibular third molars.

Aim: To compare the angular changes of the third molars relative to the occlusal plane and to the second molar long axis in extraction group and compare these changes with a non extraction group.

Materials And Methods: The study included pre and post treatment panoramic radiograph records of 90 subjects treated by first premolar extractions and 90 subjects who had been treated with non extraction orthodontic therapy ( = 90). Two angular variables were measured.