[Periodontal response to orthodontic treatment]

Monkeys bicuspids were subjected to experimental periodontitis inducing pockets with bifurcation involvement. Light continuous extrusive and intrusive forces were then applied on these bicuspids. The extrusive forces were applied on 3 monkeys; bone apposition was obtained. The intrusive forces were applied on 4 monkeys after pocket surgery and careful root surface scaling. A meticulous hygiene program was then maintained. In these conditions new attachment was gained through intrusion.