title: [Clinical use of three-dimensional surface reconstruction of spiral CT for impacted teeth in orthodontics].
abstract: OBJECTIVE
  To evaluate the value of three-dimensional surface reconstruction of spiral CT-shaded surface display (SSD) to examine the impacted teeth before orthodontic treatment.
  
  
  METHODS
  Three-dimensional surface reconstruction of spiral CT and shaded surface display (SSD) was applied to twenty patients whose impacted teeth couldn't be judged clearly through the panorama and occlusal films.
  
  
  RESULTS
  Three-dimensional surface reconstruction of spiral CT and SSD could clearly demonstrate the dental surface image including crown, root neck and root bifurcation in three-dimensional way, labial or palatal location, eruption orientation and relation with dentition.
  
  
  CONCLUSIONS
  It is concluded that the three-dimensional surface reconstruction is an accurate and effective method to examine impacted teeth before orthodontic treatment.
authors.affiliation: Dept. of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Yu-xue
authors.initials: YX
authors.lastname: Chen
authors.forename: You
authors.initials: Y
authors.lastname: Chen
authors.forename: Jie
authors.initials: J
authors.lastname: Guo
authors.forename: Yang-xi
authors.initials: YX
authors.lastname: Chen
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D009970:Orthodontics; D036542:Tomography, Spiral Computed; D014057:Tomography, X-Ray Computed; D014092:Tooth Root; D014095:Tooth, Impacted