Representative case, Group I (implants replacing mandibular molars). (a) Pretreatment x-ray. (b) Clinical image after tooth extraction. (c) Coverage of the extraction socket with a dPTFE membrane. (d) Implant placement 8 months after surgery. (e) Permanent restoration in place (14 months after extraction and 6 months after implant placement. (f) Permanent restoration in place (14 months after extraction and 6 months after implant placement.