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[Structure of connective tissue in inflammatory-sclerotic processes in the periodontium].

Two main types of extracellular matrix distribution was distinguished on the basis of immunohistochemistry of the periodontium connective tissue in various inflammatory-sclerotic processes. The 1st type was characterized by a significant reduction of interstitial collagen, moderate content of type V collagen and high content of fibronectin (in case of the exacerbation). The 2nd type was characterized by a high content of type V collagen, increased content of interstitial collagen and moderate amount of fibronectin (in case of reparative sclerosis). An inversion of the relation between the I and III collagen types in favour of the latter, high level of type V collagen and permanent presence of fibronectin were characteristic for the scar tissue. These properties of scar connective tissue indicate its immaturity and permanent activity.