“…Further evidence of BOP % (ranging between 20%–30%) determining a higher risk for periodontal disease progression was demonstrated in a number of studies (Badersten, Nilveus, & Egelberg, ; Claffey, Nylund, Kiger, Garrett, & Egelberg, ; Matuliene et al, ). Bleeding on probing at implant sites was also shown to be associated with disease progression (Karlsson et al, ; Luterbacher, Mayfield, Brägger, & Lang, ; Giovanni Serino & Turri, ). The percentage of BOP is, therefore, used as a second risk indicator in the IDRA functional diagram.…”