[Cephalometric analysis of implant anchorage-assisted retraction of anterior teeth].
OBJECTIVE
The purpose of this study is to compare the different effects of alveolar bone remolding due to retraction of anterior teeth by two types of anchorage mini-screw implant or regular maximum anchorage.


METHODS
The sample comprised 26 orthodontic patients with upper dental alveolar bone protrusion and mild crowding. The treatment plan was to remove the four first bicuspids. 14 patients,3 males,11 females, aged 20-54 years old (mean: 25 years) were treated with implant anchorage to retract the maxillary anterior teeth. 12 patients, 1 male,11 females, aged 18-30 years old (mean: 21 years) were treated with regular maximum anchorage to retract maxillary anterior teeth. Lateral cephalograms of all patients were evaluated at two stages: pretreatment, post-treatment.The changes of the long axis of the anterior teeth and dental alveolar were measured.SPSS11.0 software package was used for statistical analysis.


RESULTS
The cephalometric findings showed that the anterior teeth were retracted with implant anchorage significantly more than the maximum anchorage, there was no significant difference in the dental alveolar bone remolding between two groups. The first molars moved anteriorly slightly (less than 1mm) with implant anchorage, but significantly (3.08 mm) with regular maximum anchorage.


CONCLUSIONS
The maxillary anterior teeth are significantly retraced with the implant anchorage; the molars move mesially significantly less in the implant group than the maximum group. There are no significant differences in dental alveolar bone remolding between both groups. Support by Shanghai Leading Academic Discipline Project (Grant No.Y0203) and Research Fund of Science and Technology Committee of Shanghai Municipality (Grant No. 05B224).
Xu
Yan-Ling
YL
Department of Oral and Maxillofacial Surgery, College of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.
Fang
Bing
B
Mao
Li-Xia
LX
Feng
Yi-Miao
YM
Xia
Yun-Hui
YH
Lou
Xin-Tian
XT
Wu
Yong
Y
D000328:Adult; D001641:Bicuspid; D001863:Bone Screws; D002508:Cephalometry; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion; D008437:Maxilla; D008875:Middle Aged; D008963:Molar; D052280:Orthodontic Anchorage Procedures; D014087:Tooth Movement Techniques; D055815:Young Adult