Implants with second-passage periodontal ligament autogenous cell grafts. Low-power (×2.5) photomicrograph of implants and surrounding tissues that did (A) or did not (B) receive an application of enamel matrix derivative (EMD). Higher-power view (×10) of the cervical portion of implant with EMD shows supracrestal projections of bone (C). Same implant viewed in polarized light (E). Photomicrographs of the cervical portion of an implant that did not receive an application of EMD at ×10 (D) and at ×50 (F) magnifications