title: [Computer tomograghy study on periodontal patients with anterior displaced teeth before and after combined orthodontic-periodontal treatment].
abstract: OBJECTIVE
  To evaluate evaluation of the changes of alveolar bone height in the periodontal patients with anterior teeth displacement before and after combined orthodontic-periodontal treatment with circumferential fibrotomy.
  
  
  METHODS
  Totally 16 periodontal patients with anterior displaced teeth were analyzed after random clinical trialed as groups with and without circumferential fibrotomy of involving teeth followed by orthodontic intrusion. Evaluations of the changes of alveolar bone were given before and after treatment by means of periapical X-ray film and CT scan of the involving teeth.
  
  
  RESULTS
  Orthodontic treatment with circumferential fibrotomy can increase the height of crest bone. Alveolar bone height was increased in the patients with circumferential fibrotomy followed by orthodontic intrusion of displaced anterior teeth. Alveolar bone height was increase by 1.2 mm on average in circumferential fibrotomy patient. In the patients with symmetric alveolar bone loss, 0.8 mm increase of alveolar bone height was observed following treatment. For the patients with asymmetric alveolar bone loss, 0.9 mm increase of alveolar bone height was detected in mild bone loss patients, but 1.4 mm and 2.2 mm increase of alveolar bone height were found in moderate and severe bone loss patients, respectively. For patients having the orthodontic treatment without circumferential fibrotomy, the alveolar bone height was increased by 0.1 mm only. Statistic significance was found between the circumferential fibrotomy group and non-fibrotomy group.
  
  
  CONCLUSIONS
  Combined orthodontic-periodontal treatment with circumferential fibrotomy could correct the malpositioned teeth, and improve the periodontium conditions and gain the crest bone.
authors.affiliation: Department of Orthodontics, Peking University Stomatological Hospital, Beijing 100081, China. sjlily@yeah.net
authors.forename: Jie
authors.initials: J
authors.lastname: Shi
authors.forename: Yanheng
authors.initials: Y
authors.lastname: Zhou
authors.forename: Minkui
authors.initials: M
authors.lastname: Fu
mesh_terms: D000328:Adult; D000539:Alveolar Process / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009971:Orthodontics, Corrective; D010518:Periodontitis / Q000150:complications*; D014057:Tomography, X-Ray Computed; D014085:Tooth Migration / Q000000981:diagnostic imaging / Q000628:therapy*