崇愛牙醫診所(資料重建中,歡迎新舊朋友)

EXTRACTION  OR  EXPAND?

2 MAJOR CIRCUMSTANCES for extraction

1)CL I  crowding

     extract?  or   e-x-p-a-n-d?

2)CL  II post-adolescence

    extraction for camouflage?

    0-3  mm            expand

   10mm   or  more     extract

    4-9 mm  expand? extract?

在1960年代為何增加?(why the increase in 1960s?)

→search for stability

→technique -related  introduction of begg technique~~full rather than partial banding

自1988年後為何下降(why the decrease more recently since 1988s)?

→esthetic considerations

→concerns about stability

→bonding

→TMD accusations

→treatment time

●severe extraction indications:

1)severe crowding >10 mm usually requires extraction~~if  in doublt,don't!

2)good facial pattern~not skeletal CL II  or  CL III

3)fixed appliance treatment aviable in phase II treatment

Camouflage in orthodontics – review article