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Fig.8 (3 months after ortho treatment): Lingual button has been placed on the buccal surface of the lower right 2nd premolar, which is distalized so much that it is touching the mesial root of the 1st molar. The latter has just been removed. D: the distal residual root of the 1st molar.
Xin Wei, DDS, PhD, MS 1st edition 10/10/2013, last revision 05/02/2017