[Clinical trial on intrusion of overerupted maxillary molars with microscrew].

OBJECTIVE: To investigate the imtrusion of overerupted molars with microscrews as anchorage. METHODS: Thirteen adult patients were treated with microscrew anchorage and fixed appliances. Twenty-three overerupted posterior maxillary teeth were intruded. The intrusive movement was investigated on cephalometric radiographs. RESULTS: The molars were intruded and the occlusal plane was corrected successfully in all patients. The treatment period of intrusion was from 5 to 18 months (mean 10.4 months). Significant true intrusion of overerupted maxillary molars, ranged from 0.45 mm to 7.00 mm [mean (2.86 +/- 1.80) mm], was achieved (P < 0.001). The apical root resorption was not clinically significant and the bone level was unchanged. CONCLUSIONS: The microscrew anchorage and fixed appliances were applicable and efficacious for intrusion of overerupted maxillary molars.