MMP8 and periodontal disorder: Especially fragmented low molecular size MMP‐8 species and PMN elastase activity are surrogates and biomarkers of periodontal disease activity and collagenolytic and proteolytic inflammatory burden (Buduneli et al., 2011; Kiili et al., 2002; Leppilahti et al., 2011; Romanelli et al., 1999; Uitto et al., 1990).