title: [Clinical outcome evaluation of midpalatal mini-implant anchorage system in orthodontic treatment].
abstract: OBJECTIVE
  To evaluate the effect of midpalatal mini-implant anchorage system in fixed appliance treatment.
  
  
  METHODS
  In this study, 14 adolescents who had skeletal class I or II malocclusions were involved. Maximal anchorage was required during orthodontic treatment. Maxillary first premolars of the selected individuals were extracted and the individuals were treated by fixed appliance. One mini-implant was inserted in the midpalatal suture region and a transpalatal arch (TPA) made of 0.019 inch×0.022 inch(1 inch=2.54 cm) stainless steel was adhered to the mini-implant and upper first molars. Cephalometric radiographs taken after mini-implants inserted (T0) and before mini-implants removing (T1) were traced and measured. SN-7 plane and PP plane were used as reference planes. Student's t-test was used.
  
  
  RESULTS
  The successful rate of midpalatal mini-implant was 73.9%. All the items measured were found with no significant difference between the two groups.
  
  
  CONCLUSIONS
  This mini-implant system as orthodontic anchorage in midpalatal region can be an alternative method of maximal anchorage during orthodontic treatment.
authors.affiliation: Department of Orthodontics, the Second Dental Center, Peking University School and Hospital of Stomatology, Beijing 100101, China.
authors.forename: Y C
authors.initials: YC
authors.lastname: Pan
authors.affiliation: Department of Orthodontics, the Second Dental Center, Peking University School and Hospital of Stomatology, Beijing 100101, China.
authors.forename: J H
authors.initials: JH
authors.lastname: Zhao
mesh_terms: D000293:Adolescent; D001641:Bicuspid; D002508:Cephalometry; D006801:Humans; D008437:Maxilla; D008963:Molar; D052280:Orthodontic Anchorage Procedures; D014087:Tooth Movement Techniques; D016896:Treatment Outcome