determination of orthodontic tooth movement and tissue reaction following demineralized freeze-dried bone allograft grafting intervention

background: socket preservation after tooth extraction is one of the indications of bone grafting to enhance preorthodontic condition. the aim of this study is to determine the effects of socket preservation on the immediate tooth movement, alveolar ridge height preservation and orthodontic root resorption. materials and methods: in a split-mouth technique, twelve sites in three dogs were investigated as an experimental study. crushed demineralized freeze-dried bone allograft (dfdba) (cenobone®) was used as the graft material. the defects were made by the extraction of 3rd premolar. on one side of each jaw, the defects were preserved by dfdba and defects of the other side left opened as the control group. simultaneously the teeth adjacent to the defects were pulled together by a niti coil spring. after eight weeks, the amount of (otm), alveolar height, and root resorption were measured. analysis of variance was used for purpose of comparison. results: there was a slight increase in otm at grafted sites as they were compared to the control sites ( p< 0.05). also a significant bone resorption in control site and successful socket preservation in experimental site were observed. reduction of root resorption at the augmented site was significant compared to the normal healing site ( p< 0.05). conclusion: using socket preservation, tooth movement can be immediately started without waiting for the healing of the recipient site. this can provide some advantages like enhanced rate of otm, its approved effects on ridge preservation that reduces the chance of dehiscence and the reduction of root resorption. key words: demineralized freeze-dried bone allograft, orthodontic tooth movement, root resorption, socket preservation