Gatti, Marcello, Giovanna Costa, Tatiana Giulia Rizzati, Francesca Scandurra, Maria Sofia Rini, and Pasqua Schiavone. 2010. “Variation of Perimplant Biofilm Induced by Non Surgical Periodontal Therapy and the Use of Probiotics”. Microbiologia Medica 25 (4). https://doi.org/10.4081/mm.2010.2398.