[Treatment of maxillary protrusion in adult with self-tapping micro-screw implants].
OBJECTIVE
To investigate the position change of upper molars and incisors in order to evaluate the stability of posterior anchorage with the application of micro-screw implant.


METHODS
Eight adult patients with severe maxillary protrusion were included. Upper first premolars were extracted and upper posterior anchorage was reinforced with micro-screw implant in all patients. Cephalometric and cast analyses were carried out to record the position change of molar and micro-screw.


RESULTS
During treatment the micro-screw implants kept stable in sagittal and vertical plane. Neither the mesial-distal movement nor the tipping of the upper molars during the treatment was statistically significant (P > 0.05). The edge of upper incisors was retracted by 6.86 mm and the tipping was reduced by 18.03 degrees . The center of resistance was intruded by 3.28 mm on average. Significant change was observed (P < 0.01).


CONCLUSIONS
Micro-screw implant could provide good anchorage control in the orthodontic treatment.
Wang
Da-wei
DW
Department of Orthodontic, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China. fzcu2@tom.com
Feng
Zhi-cai
ZC
Zhu
Shuang-lin
SL
Lu
Xin-hua
XH
Zhang
Hong
H
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D052280:Orthodontic Anchorage Procedures; D016896:Treatment Outcome; D055815:Young Adult