1. Retinerte hjornetenner. Kjeveortopediske aspekter;Hasund;Fasett,1967
2. Clinical assessment of injuries in orthodontic movement of impacted teeth;Boyd;Am J Orthod,1982
3. Periodontal orthodontic interrelationships;Vanarsdall,1994
4. Rare earth magnets and impaction;Vardimon;Am J Orthod Dentofac Orthop,1991
5. Periodontal status of ortho- dontically treated impacted maxillary canines;Wisth;Angle Orthod,1976