Apr 01, 2020 · Before suturing, the passive stability of the membrane over the alveolus was confirmed, as well as the absence of folds or wrinkles in the membrane. The flaps were then be approached in the pre-extraction position and sutured with crossed sutures, aiming to increase the stability of the membrane, with PTFE 4-0 thread (Cytoplast PTFE, CS0618PREM