Analysis of the effect of the plasma rich in growth factors on bone regeneration around a titanium implant in an animal model. Bone structure was examined histologically after 8 weeks. (A) A stained section shows the compact cortical structure of the bone surrounding the entire implant. (B) A typical section from a control implant where soft tissue has been lost from the apical portion during the biopsy. (C and D) Macroscopic views of similar treated and control implants, respectively.