This issue of Dental Clinics of North America focuses on Unanswered Questions in Implant Dentistry and is edited by Dr. Mohanad Al-Sabbagh. Articles will include: Is there a contraindication for dental implant?; Should cone beam tomography be routinely obtained in implant dentistry?; What is the optimal ridge preservation technique?; Resorbable versus non-resorbable membrane: when and why?; Is there an alternative to an invasive site development?;...