Fig.5. When .018 stiff stainless steel wire is used, the four front teeth are bound to a mini-implant (arrowhead: <) placed in the palatal through T wire (arrow: <--). These 4 incisors and the mini are an anchorage unit (buccally power chain being used) to move the first molars (6) distally through long open coil springs (*). When the first molar is pushed backward enough, brackets will be placed in the 2nd premolars (5). New shorter open coil springs will be used to push the 2nd premolars distally. So on and on with 1st premolars (4) and canines (3).
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Xin Wei, DDS, PhD, MS 1st edition 02/24/2012, last revision 04/30/2017