Figure 1

(A) A preoperation picture showing tooth loss in a front view; (B) the implant was inserted through the xenogeneic bone ring into the alveolar bone; (C) bovine bone substitute filled the remaining free space in the defect; (D) re-entry was performed with a full-thickness mucoperiosteum flap after 6 months; (E) healing abutments were placed; (F) crowns were rehabilitated 8 months later after the surgery.