title: Evaluation of arch form between Vietnamese and North American Caucasians using 3-dimensional virtual models.
abstract: The purpose of this study was to investigate the three-dimensional (3D) morphologic differences in the mandibular arch of Vietnamese and North American White subjects. The sample included 113 Vietnamese subjects (41 Class I, 37 Class II and 35 Class III) and 96 White subjects (29 Class I, 30 Class II and 37 Class III). The samples were regrouped according to arch form types (tapered, ovoid, and square) to compare the frequency distribution of the three arch forms between ethnic groups in each angle classification. The facial axis point of each tooth was digitized on 3D virtual models. Four linear and two ratio variables were measured. In comparing arch dimensions, the intercanine and intermolar widths were wider in Vietnamese than in Whites (p < 0.001, p = 0.042, respectively). In the White group, there was even frequency distribution of the three arch forms. However, in the Vietnamese group, the square arch form was the most frequent followed by tapered and ovoid arch forms. The arch forms of Whites were narrower than Vietnamese. In North American Whites, the distribution of the arch form types showed similar frequency. In Vietnamese, the square arch form was more frequent.
authors: Former graduate student, Graduate School, The Catholic University of Korea, Seoul, Korea.
authors: Vu Thi Thu
authors: VT
authors: Trang
authors: Associate professor and chair, Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA.|Adjunct Professor, Graduate School of Dentistry, Kyung Hee University, Seoul, South Korea.
authors: Jae Hyun
authors: JH
authors: Park
authors: Research assistant professor, Department of Orthodontics, The Catholic University of Korea, Seoul, Korea.|Visiting professor, Department of Postgraduate Studies, the Universidad Autonoma del Paraguay, Asuncion, Paraguay.
authors: Mohamed
authors: M
authors: Bayome
authors: Former Postgraduate Resident, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA.
authors: Shruti
authors: S
authors: Shastry
authors: Former Postgraduate Resident, Department of Orthodontics, Center for Advanced Dental Education, Saint Louis University, Saint Louis, MO, USA.
authors: Alex
authors: A
authors: Mellion
authors: Professor, Department of Orthodontics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
authors: Yoon-Ah
authors: YA
authors: Kook
mesh_terms: D000293:Adolescent; D000328:Adult; D000885:Anthropology, Physical; D044466:Asian People / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D008334:Mandible / Q000033:anatomy & histology*; D014070:Tooth / Q000033:anatomy & histology*; D014481:United States; D014744:Vietnam; D044465:White People / Q000706:statistics & numerical data*; D055815:Young Adult