Objective To study the bracket placement and archwire bending based on ethnic differences and individual differ- ences of normal occlusion.Methods The prominence, tip, torque, upper first molar offset of crown and arch form between Chi- nese and Caucasian normal occlusion were compared.Results The results showed the ethnic differences of prominence, tip, torque, upperfirstmolar offset of crown and arch form between Chinese and Caucasian normal occlusion. The placement of bracket was influenced by the crown morphology.Conclusion The adjustments of the bracket placement and arch wire bending with Edgewise and pre-adjusted appliance are necessary to adapt to ethnic difference and individual difference.
