title: Cephalometric configuration of the occlusal plane in patients with anterior open bite.
abstract: BACKGROUND
  This study was performed to investigate the cephalometric configuration of the occlusal plane in patients with anterior open bite.
  
  
  METHODS
  Of 61 subjects with open bite (overbite ≥3.75 mm) who had been recruited consecutively from January 2006 to November 2013 and had no history of orthodontic treatment, 14 cephalometric landmarks indicating the incisal edge or the buccal or mesiobuccal cusp tips of each tooth were used for K-means clustering to classify the occlusal plane configuration. For the open-bite group and a control group with normal occlusion (n = 38), dentoalveolar height, which is the perpendicular distance of each tooth to the palatal or mandibular plane, was compared among the clusters and between the 2 groups.
  
  
  RESULTS
  The open-bite subjects were divided into 2 clusters according to occlusal contact of the premolars: Y-form and V-form (with and without premolar contact, respectively). The normalized dentoalveolar heights of the 4 mandibular teeth (lateral incisor to second premolar) were significantly greater in the Y-form class than in the V-form class. The dentoalveolar heights of the 5 maxillary teeth (lateral incisor to first molar) were significantly greater in the open-bite group than in the control group.
  
  
  CONCLUSIONS
  For anterior open-bite treatment, the cephalometric configuration of the occlusal plane should be considered based on the occlusal contacts of the premolars.
authors.affiliation: Assistant professor, Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Yoon Jeong
authors.initials: YJ
authors.lastname: Choi
authors.affiliation: Postgraduate student, School of Chemical Engineering, Sungkyunkwan University, Suwon, Korea.
authors.forename: Dong Jae
authors.initials: DJ
authors.lastname: Kim
authors.affiliation: Assistant professor, School of Chemical Engineering, Sungkyunkwan University, Suwon, Korea.
authors.forename: Jaewook
authors.initials: J
authors.lastname: Nam
authors.affiliation: Associate professor, Department of Orthodontics, Gangnam Severance Dental Hospital, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Chooryung J
authors.initials: CJ
authors.lastname: Chung
authors.affiliation: Professor and chair, Department of Orthodontics, Gangnam Severance Dental Hospital, Yonsei University, Seoul, Korea. Electronic address: khkim@yuhs.ac.
authors.forename: Kyung-Ho
authors.initials: KH
authors.lastname: Kim
mesh_terms: D000328:Adult; D000539:Alveolar Process / Q000473:pathology; D059925:Anatomic Landmarks / Q000473:pathology; D001641:Bicuspid / Q000473:pathology; D002508:Cephalometry / Q000379:methods* / Q000706:statistics & numerical data; D016000:Cluster Analysis; D003481:Cuspid / Q000473:pathology; D003724:Dental Arch / Q000473:pathology; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007180:Incisor / Q000473:pathology; D008297:Male; D008334:Mandible / Q000473:pathology; D008963:Molar / Q000473:pathology; D024343:Open Bite / Q000473:pathology*; D010159:Palate / Q000473:pathology; D019228:Tooth Crown / Q000473:pathology*; D055815:Young Adult