IL1RN and Peri-Implantitis: Liao et al. [10] included 13 articles reporting IL−1A (−889), IL−1B (−511), IL−1B (+3954), and IL−1RN (VNTR) polymorphisms and the risk of dental PIDs and also mixing the patients with peri-implantitis, implant loss, and marginal bone loss based on the allelic model.