title: Assessment of anterior-posterior jaw relationships in Korean adults using the nasion true vertical plane in cone-beam computed tomography images.
abstract: OBJECTIVE
  The aims of this study were to investigate a simple method for assessing anterior-posterior jaw relationships via cone-beam computed tomography (CBCT) images taken in the natural head position (NHP) relative to the nasion true vertical plane (NTVP), and measure normative data in Korean adults with normal profiles.
  
  
  METHODS
  Subjects were selected from patients presenting for third molar extraction and evaluated as having normal profiles by three examiners. The CBCT images of 80 subjects (39 males, 41 females) were taken in the NHP according to Solow and Tallgren's method. Linear measurements of the A-point, B-point, and Pog were calculated relative to the NTVP. Student's t-test was used to assess sexual differences in these measurements.
  
  
  RESULTS
  The mean linear measurements of the A-point, B-point, and Pog relative to the NTVP were 0.18 mm (standard deviation [SD], 4.77 mm), -4.00 mm (SD, 6.62 mm), and -2.49 mm (SD, 7.14 mm) respectively in Korean males, and 1.48 mm (SD, 4.21 mm), -4.07 mm (SD, 6.70 mm) and -2.91 mm (SD, 7.25 mm) in Korean females respectively. There were no statistically significant differences between Korean males and females (p < 0.05).
  
  
  CONCLUSIONS
  Three-dimensional CBCT analysis using the NTVP is a simple and reliable method for assessing anterior-posterior skeletal relationships.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea.
authors.forename: Youngju
authors.initials: Y
authors.lastname: Park
authors.affiliation: Department of Orthodontics, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea.
authors.forename: Youngserk
authors.initials: Y
authors.lastname: Cho
authors.affiliation: Graduate School of Orthodontics, School of Dentistry, University of Nevada Las Vegas, Las Vegas, NV, USA.
authors.forename: James
authors.initials: J
authors.lastname: Mah
authors.affiliation: Department of Orthodontics, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea.
authors.forename: Janghoon
authors.initials: J
authors.lastname: Ahn
keywords: Cone-beam computed tomography; Jaw relation; Nasion true vertical plane; Natural head position