title: [Application of three dimensional model in evaluating the effect of artificial bone implantation of hard cleft palate on the development of maxilla].
abstract: OBJECTIVE
  To observe the effect of artificial bone implantation of hard cleft palate on the development of maxilla.
  
  
  METHODS
  From January 1997 to December 1999, 40 patients with hard cleft palate were randomly divided into two groups: control group and implantation group (n = 20 each). The patients in the implantation group received an implantation of compound artificial bone of HA-Bone cement. All patients had a follow-up since 16 years old. A three dimensional model was established with computed tomography and rapid prototype technique to analyze the maxilla in three dimension. At the same time, a dentognathic model was employed.
  
  
  RESULTS
  There were no differences in the results between the three dimensional and dentognathic models. No difference was found in the development of maxilla in length and height between the control and implantation groups. There were marked differences in the development of maxilla in width between two groups (67.6 mm ± 4.3 mm vs 61.3 mm ± 4.1 mm, 63.5 mm ± 3.9 mm vs 57.3 mm ± 3.1 mm, 26.2 mm ± 1.8 mm vs 26.4 mm ± 1.9 mm, all P < 0.05). The width of maxilla in the implantation group was markedly wider than that in the control group.
  
  
  CONCLUSIONS
  The application of three dimensional model for evaluating the development of maxilla is both straightforward and accurate. Bone implantation of hard cleft palate is an obvious boost to the development of maxilla in width. It should be included into a comprehensive orthodontic treatment for patients with hard cleft palate.
authors.affiliation: Department of Stomatology, Second Affiliated Hospital, Medical College, Zhejiang University, Hangzhou 310009, China. guowen_76@126.com
authors.forename: Feng-Guo
authors.initials: FG
authors.lastname: Yan
authors.forename: Fei-Yun
authors.initials: FY
authors.lastname: Ping
authors.forename: Yi-Dan
authors.initials: YD
authors.lastname: Shan
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
authors.forename: Jun-Lie
authors.initials: JL
authors.lastname: Yan
mesh_terms: D000293:Adolescent; D018786:Bone Substitutes / Q000627:therapeutic use*; D002648:Child; D002675:Child, Preschool; D002972:Cleft Palate / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000254:growth & development*; D008445:Maxillofacial Development; D008953:Models, Anatomic; D021362:Palate, Hard / Q000637:transplantation
chemical_list: D018786:Bone Substitutes