title: Retrospective study of maxillary sinus dimensions and pneumatization in adult patients with an anterior open bite.
abstract: BACKGROUND
  The aim of this study was to evaluate differences in the maxillary sinus floor levels between adults with an anterior open bite and those without.
  
  
  METHODS
  This retrospective study included 30 subjects: 15 adults with an anterior open bite (mean age, 21.5 ± 4.3 years) and 15 control subjects with normal occlusion (mean age, 21.7 ± 3.1 years). Cone-beam computed tomography and lateral cephalograms were analyzed before treatment.
  
  
  RESULTS
  The open-bite group exhibited a significantly greater maxillary posterior alveolar height (P <0.05). The craniocaudal heights of the maxillary sinus in the region between the first and second molars and between the second premolar and first molar were significantly greater in the open bite group (40.5 and 39.0 mm, respectively) than in the control group (36.7 and 34.7 mm, respectively; P <0.05 for both). The basal bone heights in the regions between the first and second molars, the second premolar and first molar, and the first and second premolars were significantly smaller in the open-bite group than in the control group (P <0.001 for all).
  
  
  CONCLUSIONS
  Vertical pneumatization of the maxillary sinus floor in the region between the first and second molars and between the second premolar and first molar is greater in adults with an anterior open bite than in those without, whereas basal bone height in the maxillary posterior region is lower in the open-bite patients.
authors.affiliation: Postgraduate student, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Jesung
authors.initials: J
authors.lastname: Ryu
authors.affiliation: Fellow, The Institute of Cranio-Facial Deformity, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Sung-Hwan
authors.initials: SH
authors.lastname: Choi
authors.affiliation: Associate professor, The Institute of Cranio-Facial Deformity, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Jung-Yul
authors.initials: JY
authors.lastname: Cha
authors.affiliation: Professor, The Institute of Cranio-Facial Deformity, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Kee-Joon
authors.initials: KJ
authors.lastname: Lee
authors.affiliation: Professor, The Institute of Cranio-Facial Deformity, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea. Electronic address: hwang@yuhs.ac.
authors.forename: Chung-Ju
authors.initials: CJ
authors.lastname: Hwang
mesh_terms: D000293:Adolescent; D000328:Adult; D000539:Alveolar Process / Q000000981:diagnostic imaging / Q000473:pathology; D016022:Case-Control Studies; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging / Q000473:pathology*; D024343:Open Bite / Q000178:diet therapy / Q000473:pathology*; D012189:Retrospective Studies; D055815:Young Adult