(courtesy of 
An Essix Appliance is a clear plastic shell that conforms exactly to the
contours of the teeth to aid in the maintenance of tooth position (retention)
carriere motion在做牙列的後退過程中,另一齒列當做anchorage,臨床上約可以有
四種anchorage的方法可以使用
1)lingual arch
2)full mouth DBS
3)Essix appliance
4)miniscrew
MOTION讓後牙的大臼齒產生DISTAL ROTATION,轉正的大臼齒前方出現約2mm的空間,這些空間就是
可以讓牙列重新排列的生力軍,,,,
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