Diagnostic accuracy of active matrix metalloproteinase‐8 point‐of‐care test for the discrimination of periodontal health status: Comparison of saliva and oral rinse samples.

Background and Objectives: Assessment of biomarkers, specifically active matrix metalloproteinase‐8 (aMMP‐8), in saliva/oral rinses is a promising diagnostic approach for periodontal health and disease. Different oral fluids have specific advantages and limitations. This study investigates the effect of sampling different fluids on the accuracy of an aMMP‐8 point of care test (POCT). Methods: Unstimulated whole saliva, a first, and a second oral rinse were sequentially taken from 95 consecutive adults. aMMP‐8 was quantitatively determined with a lateral flow immunoassay (index test). A full‐mouth periodontal examination was used to establish a diagnosis according to the 2017 World Workshop classification of periodontal diseases (reference standard). Diagnostic measures of the area under the receiver operating characteristic curve (AUROC), sensitivity, and specificity were assessed and compared. Results: In all oral fluid samples, periodontitis patients (N = 61) had significantly elevated aMMP‐8 levels and increased test positivity rates compared with subjects with periodontal health or gingivitis (N = 34). The intra‐individual comparison showed that aMMP‐8 levels were significantly higher in 1st oral rinse compared with other samples (1st oral rinse > saliva = 2nd oral rinse, p =.007). The aMMP‐8 test using 1st oral rinse exhibited the best accuracy for detecting periodontitis with a sensitivity of 80.3%, a specificity of 67.8% and an AUROC of 0.740. Conclusions: A 30‐second oral rinse with water omitting the prerinse provided the best accuracy to discriminate periodontal health and disease with an aMMP‐8 POCT. This regimen seems promising for further studies in large representative populations to verify the current findings. [ABSTRACT FROM AUTHOR]