When using edgewise appliance, the height of the tray position of maxillary central incisor is 4.5 mm

It conforms to the anatomical structure of teeth and meets the needs of orthodontics.

1. conforms to the anatomical structure of teeth: maxillary central incisor is a part of maxillary anterior teeth, and its position and height are determined according to the anatomical structure of teeth. Setting the bracket position at the height of 4.5mm is to conform to the anatomical structure of the teeth and ensure the stability and effect of the appliance.

2. Meet the needs of orthodontic treatment: edgewise appliance is a common orthodontic method, and its principle is to exert pressure on teeth through the power of archwire to move them to the correct position. Setting the bracket position at the height of 4.5mm is to meet the needs of orthodontic treatment and ensure that the teeth can move in the expected direction and speed.