Comparison of mandibular arch forms of Korean and Vietnamese patients by using facial axis points on three-dimensional models.
10.4041/kjod.2013.43.6.288
- Author:
Kil Jun LEE
1
;
Vu Thi Thu TRANG
;
Mohamed BAYOME
;
Jae Hyun PARK
;
Yong KIM
;
Yoon Ah KOOK
Author Information
1. Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Arch form;
Digital models;
Ethnic norms;
Vietnamese;
Korean
- MeSH:
Asian Continental Ancestry Group*;
Axis, Cervical Vertebra*;
Ethnic Groups;
Humans;
Malocclusion;
Tooth
- From:The Korean Journal of Orthodontics
2013;43(6):288-293
- CountryRepublic of Korea
- Language:English
-
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.
