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When the immediate implant is placed in the buccal socket (Fig.3 CT coronal section of the tooth #2), the implant appears to be shallow with possibility of thread exposure (white line: buccal (B) crest and beginning of the threads) unless the implant is pushed into the sinus.
When the implant is placed in the middle of the socket (i.e., septum), it should be shorter (11 mm, Fig.4 coronal section) with sinus lift (bone graft, osteotomes, bone expanders).
Xin Wei, DDS, PhD, MS 1st edition 05/16/2015, last revision 05/16/2015