Amato Francesco, Polara Giorgio, Prestileo Chiara, Anatomical Risk Factors Associated with Immediate Extraction Placement in the Posterior Maxilla: A Human Retrospective Cone-Beam Study, Journal of Dentistry And Oral Implants, Volume 1, Issue 2, 2016, Pages 30-40, ISSN 2473-1005, (https://openaccesspub.orgjdoi/article/326) Keywords: subsinus basal bone; immediate placement; maxillary sinus; cone-beam CT; membrane perforation.