American Journal of Orthodontics and Dentofacial Orthopedics
Original articleComparison of arch forms between Korean and North American white populations
Section snippets
Material and methods
The database for this study consisted of 2 sample groups, white and Korean. The white group consisted of the pretreatment mandibular dental models of 60 Class I, 50 Class II, and 50 Class III patients from the University of Southern California, Department of Orthodontics, and a private practice in San Diego, Calif. The Korean group consisted of models from 114 Class I, 119 Class II, and 135 Class III patients obtained from Wonkwang University, Department of Orthodontics, Korea (Table I). All
Results
Table II depicts the arch dimension measurements and results of analysis of covariance for the white and Korean Class I, II, and III samples. The white group showed significantly smaller intercanine and intermolar widths for all 3 Angle classifications. In addition, the white group showed significantly smaller canine and molar W/D ratios for Class I and Class II malocclusions than the Korean group. All the Class I, II, and III samples demonstrated statistically significant differences in widths
Discussion
With the widespread use of superelastic wires, it might be more clinically appropriate and accurate to select the most suitable arch form according to each patient's pretreatment arch form, ethnicity, and type of malocclusion to achieve a stable, functional, and esthetic goal. Clinical bracket points corresponding to a bracket slot were used in this study, according to a method described in a recent report.13 From the standpoint of clinical orthodontics, this method seems to offer greater value
Conclusions
This study demonstrates that when treating Korean patients, one should expect to use square arch forms in a significant percentage of patients. The current preformed superelastic wires are too narrow for many patients in Asian populations and should be modified when these patients are being treated.
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