[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.