Mesial bodily movement of maxillary and mandibular molars with segmented mechanics

The displacement of teeth into areas with substantial atrophy of the alveolar ridge or through the maxillary sinus has been considered a major limitation. Bone formation can, however, be generated if the orthodontic appliance can produce the necessary strain distribution along the entire periodontal ligament. The aim of this case report is to illustrate how bone formation can accompany mesial bodily movement of maxillary and mandibular molars. The necessary strain distribution was generated by the rational use of segmented mechanics. The use of superelastic Ni-Ti springs allows the application of low and constant forces over a wide range of deactivation, thus providing a uniform strain in the periodontium. The result of those appliances is highly predictable and side effects can be minimized effectively.