There is no bone height reduction after extraction of #15 (Fig.5, as compared to the immediate site of #2). With socket preservation, a longer implant will be placed at #2 (Fig.6, as compared 8.5 mm at #15 without bone graft).
Sinus Lift With Extraction Last Next
Xin Wei, DDS, PhD, MS 1st edition 03/10/2020, last revision 09/29/2020