The third lower molar in orthodontic therapy

Introduction:The M3 eruption is according with mandibula arch growing and facial typology. This teeth, especially M3 lower created many problems in orthodontic field, because in most of cases isn’t enough space on the arch. Some crowding cases are treating by extractions (Pm1, Pm2, and M1) and there is a possibility to create a space for normal eruption of M3. In other cases the extractions are good solutions for crowding but are necessary to have a germectomy at third lower molar. Aim: The authors were tried to analyze the role of the lower third molar in crowding cases at hipodivergent cases treated by SWT method. Material and method: The study comprised 50 subjects (28 girls and 22 boys) aged 17 – 19, having a sever crowding. The patients were clinical and radiological examinated. Results: During the life the long and the lenth of the arch decrease inspite of any orthodontic treatment even with extractions, and the pacients presented some crowding in lower incisive area.We recommande to make germectomy at M3 lower to avoid a relapse. Conclusions: The evolution of lower M3 is difficult and the chances to remain on the arch are less, especial at patients with crowding. At the patients with extractions and hipodivergent typology is important to eruption guidance of the M3.