[Treating maxillary dental arch crowding and protrusion of the patient with mandibular molars missing by implanting miniscrew anchorage].
OBJECTIVE
To study the clinical effectiveness of implanting miniscrew serving as anchorage instead of molars in treating maxillary dental arch crowding and protrusive patients mandibular molars complete missing.


METHODS
Eight adult patients aged from 22 to 38, whose maxillary dental arch were crowding and protrusion, with mandibular molars missing were chosed. At the missing side, a miniscrew was implanted on the buccal surface, 11-13 mm away from the distal end of the second premolar. After implanting, a self-made miniscrew traction cap was attached to its supergingival section by keyway retention. Premolars and anterior teeth were tracted in turn to distal end. Intermaxillary traction II was made necessarily on the traction cap.


RESULTS
Successful results were acquired after treating together with normal overbite, overjet and right occlusion relation. It took 24 months in the longest course, 15 months in the shortest course and 20.8 months on average.


CONCLUSIONS
The implanting miniscrew anchorages could be used in maxillary dental arch crowding and protrusive patients with single molars complete missing.
Jiang
Shi-Tong
ST
Dept. of Orthodontics, Donggang People's Hospital of Rizhao, Rizhao 276800, China.
Jiang
Xiao-Lei
XL
Qin
Yong
Y
Zhang
Ru
R
Liu
Hong-Jie
HJ
Jiao
Guang-Jun
GJ
Yuan
Kuo
K
D000328:Adult; D001641:Bicuspid; D001863:Bone Screws; D002508:Cephalometry; D003724:Dental Arch; D006801:Humans; D008963:Molar; D052280:Orthodontic Anchorage Procedures; D057887:Overbite; D014087:Tooth Movement Techniques