Fig.4 is taken immediately post extraction. The septum (>) is to be sectioned transversely by a series of thin osteotomes, as shown by the black line in the insert. The sectioning makes it easy to engage drills in the septum subsequently.
The buccal furcal gingiva (*) will be saved. The soft tissue is precious for socket healing after extraction.
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Xin Wei, DDS, PhD, MS 1st edition 06/13/2014, last revision 11/04/2018