After osteotomy at #3 with IS guide, a 4.5x8 mm SM implant has to be placed free hand because of mismatch of the SM implant and IS guided fixture driver.  With minor adjustment, the implant is placed subcrestal to reduce chance of future periimplantitis (Fig.1,2).  临时牙桥桥墩调整，产生空隙。钻洞后骨面出血，植入植体止血，但第二天愈合基台周围牙龈出血，纱布止血有效，怎么才能长期压迫止血？Subcrestal Last Next Xin Wei, DDS, PhD, MS 1st edition 07/22/2019, last revision 03/07/2021