Relationship between lactate dehydrogenase and myeloperoxidase levels in human gingival crevicular fluid and clinical and microbial measurements

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Abstract
The present study was designed to determine, in a cross‐sectional study, whether there was any relationship between levels of lactate dehydrogenase (LDH) and myeloperoxidase (MPO) in gingival crevicular fluid (GCF) and clinical periodontal status or microbial parameters. Another objective was to determine, in a longitudinal study, the effect of a single session of root planning on GCF levels of LDH and MPO and the relation to changes in clinical and microbial measurements. 15 and 12 test subjects with moderate to severe periodontal disease were seen in the cross‐sectional and longitudinal study, respectively. 1 healthy and 2 diseased sites were evaluated in each subject. Higher LDH and MPO levels in GCF were closely associated with higher clinical and microbial signs of periodontal disease. Root planning was effective in reducing these enzymes in GCF, with an accompanying decrease in clinical and microbial signs associated with disease. The return of LDH to baseline levels at 3 months after instrumentation, without a corresponding return of clinical signs of disease, may serve as a marker for subclinical periodontal pathology.

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