[Extraction of second molars as orthodontic therapy]

Extraction of second molars as an orthodontic measure is a simple procedure which can lead to good clinical results. Indications as well as timing and long term effects on buccal occlusion are discussed. It is concluded that acceptable results may only be expected when the extraction is strictly indicated and carried out in cases when the third molars have reached their full crown stage but before radiographic evidence of root formation. Upper third molars with an angulation of less than 30 degrees and lower third molars with an angulation of 30-60 degrees to the occlusal plane are likely to give a satisfactory position after eruption.