Patient NU, a 68-year-old woman. (a) An implant was inserted into the mesial root alveolus of a lower-left molar extracted 4 months earlier. (b) After 3 months, the site developed symptomatologies (pain and swelling) and a radiograph disclosed a periapical radiolucency. The site was surgically debrided and disinfected and finally healed. (c) A 1.5-year postoperative radiograph