1.1. INTRODUCTION Periodontitis is the disease of the teeth supporting tissues caused mainly by gram negative microorganisms.(1) it result from an interaction between host and microorganisms and modified by various mediators such as environmental and systemic factors(2), genetic predisposition and nutrition. Periodontitis on the other hand may be a risk factor for systemic health and participate in the pathogenesis of many diseases such as diabetes mellitus (DM) and CVD. The way by which periodontitis affect systemic health or health conditions affect periodontitis is through releases of inflammatory cytokines. Periodontitis provoke a series of events involved in immune system of the host.(1)during inflammation the inflammatory cells …show more content…
periodontal clinical parameters have a limited role in periodontal disease diagnosis because it indicate the previous disease but not the activity or the presence of a new one.(34) Serum CRP has been accepted as an accurate measure for systemic inflammation.(35) In addition to serum CRP, salivary CRP can be used to monitor periodontal disease.(36) CRP may reach saliva via GCF or salivary glands. Recent studies evaluate the level of CRP in saliva and found a significant elevation in patients compare to control