title: [Comparison of the treatment effects of two molar distal movement appliances: pendulum appliance and face-bow].
abstract: OBJECTIVE
  To compare the treatment effects of pendulum appliance and traditional face-bow for distal movement of maxillary first molars.
  
  
  METHODS
  Samples (n=30) were randomly divided into two groups, of which Group P was treated with pendulum appliance, while Group F with traditional face-bow. Cephalometric radiographs were taken and analyzed by Pancherz at the pre-treatment time (T1) and the post-treatment time (T2). Student's t test was used to determine if there were significant differences between the 2 time periods and two groups.
  
  
  RESULTS
  There was significant difference between Group P and Group F in the treatment duration (20.6+/-4.0 weeks vs 26.0+/-3.6 weeks). There was also significant difference in the changes of (ms/olp- ss/olp) (3.1+/-0.53 mm vs 2.2+/-0.82 mm), (is/olp- ss/olp) (0.8+/-0.78 mm vs-1.0+/-0.88 mm) between the two groups.
  
  
  CONCLUSIONS
  The results indicate that pendulum appliance is clinically more effective and rapid for distal movement of the maxillary first molars, but more attention should be paid to the anchorage control of maxillary anterior teeth.
authors.affiliation: Department of Orthodontics, College of Stomatology, Shandong University, Jinan 250012, Shandong Province, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Ye
authors.forename: Chun-ling
authors.initials: CL
authors.lastname: Wang
authors.forename: Bo
authors.initials: B
authors.lastname: Kou
authors.forename: Dong-xu
authors.initials: DX
authors.lastname: Liu
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Ben-jun
authors.initials: BJ
authors.lastname: Zhang
mesh_terms: D002508:Cephalometry; D005145:Face; D006801:Humans; D008437:Maxilla; D008963:Molar; D009967:Orthodontic Appliances; D014070:Tooth; D014087:Tooth Movement Techniques / Q000295:instrumentation*; D016896:Treatment Outcome