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To have better anchorage, the number of brackets is apparently more than necessary (Fig.9). When the tooth #29 is mesialized by placing an open coil spring between #29 and 31, place figure 8 wire for all of the brackets as a unit to distalize the tooth #31.
Xin Wei, DDS, PhD, MS 1st edition 10/27/2016, last revision 08/15/2018