Fig. 1From: A 3-year prospective randomized clinical trial of alveolar bone crest response and clinical parameters through 1, 2, and 3 years of clinical function of implants placed 4 months after alveolar ridge preservation using two different allogeneic bone-grafting materialsFlowchart of the study design showing the eight different time points of measurements of alveolar bone crest levelsBack to article page