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Osteotomy (Fig.2 yellow circle) would tear it off. To save the soft tissue, the buccal attachment is severed (Fig.3 black line), the flap is rotated palatal (Fig.3 curved arrow) and sutured in place (Fig.5 S).
Xin Wei, DDS, PhD, MS 1st edition 07/26/2019, last revision 01/25/2020