Edition V16N05 | Year 2011 | Editorial Orthodontic Insight | Pages 20 to 29
The low intensity and long duration aggressions to the periosteum induce the formation of new layers and can increase the volume of bone and change its shape. In intrusive mechanics, the natural inclination of the roots provides the tooth inclination movement. At the same time that it promotes compression forces on the periodontal ligament of teeth subjected to this kind of mechanics, in other areas, tension forces with deflection occur. These effects also involve the outer surfaces, since the thickness of the bone in the alveolar process is thin and can lead to the formation of new layers, including the cervical part of the alveolar bone crest. In intrusive mechanics, there is an alveolar remodeling with orthodontic nature associated to a modification of bone internal and external structure, satisfying the demand for forces with orthopedic features. The intrusive effect on the so called intrusive mechanics may be the result of alveolar remodeling induced by the inclination forces, and of the modification of bone volume due to subperiosteal bone formation on the outer part of the alveolar process. Probably accurate imaging studies, with high precision CT, will be able to detect these subperiosteal phenomena in future studies involving patients before and after application of intrusive mechanics.