RESUMO
Magnetic distalizing system [MDS] was used to distalize maxillary molars in ten patients having dental class II malocclusion [1/2 unite] until normal molar relation was achieved. The resulted dentoalveolar, skeletal and biological changes were evaluated through the analysis of pre and postoperative lateral cephalometric radiographs and study models; while, the biological changes were evaluated by studying the histological and histochemical changes together with the enzymatic activity of the gingiva near the magnetic field. The results of this study showed dental and no skeletal changes with the use of MDS. Regarding the dentoalveolar changes, the maxillary first molars were distalized significantly and comfortably by bodily movement, with some distal tipping and extrusion, resulting in a significant increase in dental arch length and reduction in anterior bit depth. The maxillary incisors were significantly tipped labially resulting in a significant increase in the anterior over jet and arch length. On contrary, the dental arch width was unchanged at the molar, premolar and canine regions. Regarding the biological changes, histological, histochemical and enzymatic studies of the gingival tissues near the magnetic field five months after insertion of MDS and five months after its removal confirmed its safety, since complete recovery of the inflammation and repair of the degenerated cells were seen