“…Increased serum levels of IL‐1 β , TNF, OC, soluble intercellular adhesion molecule (sICAM), IL‐6, MMP‐9 have been reported in experimental studies in animal models as well as in clinical studies in humans (Raunio et al 2007, Guentsch et al 2009, Nakajima et al 2010). However, Özçaka et al (2010) failed to find significant differences between chronic periodontitis patients and healthy control subjects in terms of plasma OC and ICTP concentrations. In an intervention study, Marcaccini et al (2009) reported that chronic periodontitis patients had higher plasma concentrations of MMP‐3, ‐8, ‐9, and gelatinolytic activity, whereas non‐surgical periodontal treatment decreased their levels significantly.…”