Comparison of arch forms between Turkish and North American.
OBJECTIVE
The aim of this study was to clarify the morphological differences in the mandibular arches of Turkish and North American white subjects.


METHODS
The sample included 132 Turkish (34 Class I, 58 Class II, and 40 Class III) and 160 North American (60 Class I, 50 Class II, and 50 Class III) subjects. The most facial portion of 13 proximal contact areas was digitized from photocopied images of patients' mandibular dental arches. Clinical bracket points were calculated for each tooth based on mandibular tooth thickness data. Four linear and two proportional measurements were taken. The subjects were grouped according to arch form types (tapered, ovoid and square) in order to have frequency distribution compared between ethnic groups in each Angle classification.


RESULTS
The Turkish group showed significantly lower molar depth and more significant molar width-depth (W/D) ratio in all three Angle classifications. On the other hand, the Turkish group also showed a significantly larger intercanine width in Class III malocclusion and intermolar width in Class II malocclusion. The most frequent arch forms seen were the ovoid arch form in the Turkish group and the tapered form in the white group.


CONCLUSIONS
Our results demonstrate that when treating Turkish patients, one should expect to use preformed ovoid arch form orthodontic wires in a significant percentage of patients.
Assistant professor, Zirve University, Department of Orthodontics, School of Dentistry, Gaziantep, Turkey. , Zirve University, Zirve University, Department of Orthodontics, School of Dentistry, Gaziantep , Turkey.
Ahmet A
AA
Celebi
Postgraduate student, Kirikkale University, Department of Orthodontics, School of Dentistry, Kirikkale, Turkey. , Kirikkale University, Kirikkale University, Department of Orthodontics, School of Dentistry, Kirikkale , Turkey.
Hakan
H
Keklik
Assistant professor, Kirikkale University, Department of Orthodontics, School of Dentistry, Kirikkale, Turkey. , Kirikkale University, Kirikkale University, Department of Orthodontics, School of Dentistry, Kirikkale , Turkey.
Enes
E
Tan
Assistant professor, Selcuk University, Department of Orthodontics, School of Dentistry, Konya, Turkey. , Selcuk University, Department of Orthodontics, School of Dentistry, Konya , Turkey.
Faruk I
FI
Ucar
D000293:Adolescent; D003431:Cross-Cultural Comparison; D003724:Dental Arch / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008311:Malocclusion, Angle Class I / Q000208:ethnology* / Q000473:pathology*; D008312:Malocclusion, Angle Class II / Q000208:ethnology* / Q000473:pathology*; D008313:Malocclusion, Angle Class III / Q000208:ethnology* / Q000473:pathology*; D009656:North America; D014421:Turkey; D044465:White People