Abstract:

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.

Key words: normal occlusion, fixed appliance, ethnic difference