The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Comparison of mandibular arch forms of Korean and Vietnamese patients by using facial axis points on three-dimensional models

  • Lee, Kil-Jun (Graduate School of Clinical Dental Science, The Catholic University of Korea) ;
  • Trang, Vu Thi Thu (Graduate School of The Catholic University of Korea) ;
  • Bayome, Mohamed (The Catholic University of Korea) ;
  • Park, Jae Hyun (Postgraduate Orthodontic Program, Arizona School of Dentistry and Oral Health, A.T. Still University) ;
  • Kim, Yong (Private Practice) ;
  • Kook, Yoon-Ah (Department of Orthodontics, Seoul St. Mary's Hospital, The Catholic University of Korea)
  • Received : 2013.06.03
  • Accepted : 2013.07.16
  • Published : 2013.12.25
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Abstract

Objective: This study was aimed at comparing the mandibular arch forms of Korean and Vietnamese patients by using facial axis (FA) points on three-dimensional (3D) models. Methods: Mandibular casts of 68 Korean (Class I malocclusion, 30; Class II malocclusion, 38) and 78 Vietnamese (Class I malocclusion, 41; Class II malocclusion, 37) patients were scanned in their occluded positions and grouped according to arch form (tapered, ovoid, and square). The FA point of each tooth was digitized on the 3D mandibular models. The measurements and frequency distributions of the arch forms were compared between the ethnic groups. Results: The Vietnamese patients had significantly greater intercanine depth and intercanine and intermolar width-to-depth ratios than the Korean patients (p < 0.05). The frequency distributions of the arch forms were also significantly different (p = 0.038), but no sexual dimorphism was found. Conclusions: Vietnamese people tend to have deeper and wider arches than Korean people. The three arch forms are evenly distributed in Korean people, but Vietnamese people frequently have square arches. Clinicians should identify the correct arch form of an ethnic group before initiating orthodontic treatment.

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References

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