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).
Sinus Lift With Extraction Last Next 位点保留后 导板
Xin Wei, DDS, PhD, MS 1st edition 03/10/2020, last revision 10/10/2020