Nearly 6 months post banding, a 1.6x8 mm anchor pin is placed (Fig.7,8).  Next visit the pin is loose and replaced with a ball type 1-piece implant (2x10(2) mm).矫正对第二双尖牙创伤大（牙周膜增宽），效果慢。微型植体部分植入，判断方位

Prevent Debracketing Last Next Xin Wei, DDS, PhD, MS 1st edition 10/12/2018, last revision 01/05/2021