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4% for a training set of samples and 93.1% for a validation set. Conclusion:? We have established that mid-infrared spectroscopy can be used to identify periodontitis-specific molecular signatures in gingival [http://www.selleckchem.com/products/bgj398-nvp-bgj398.html FGFR inhibitor] crevicular fluid and to confirm clinical diagnoses. Future longitudinal studies will assess whether mid-infrared spectroscopy represents a potential prognostic tool, recognized as key to advancement of periodontics. ""Kretschmar S, Yin L, Roberts F, London R, Flemmig TT, Arushanov D, Kaiyala K, Chung WO. Protease inhibitor levels in periodontal health and disease. J Periodont Res 2012; 47: 228�C235. ? 2011 John Wiley & Sons A/S Background and Objective:? Our previous study showed that protease inhibitors were attenuated by the periodontal pathogen Porphyromonas gingivalis in cultured gingival epithelial cells. We hypothesize that fewer protease inhibitors would be present in more advanced periodontal disease sites, where the level of P.?gingivalis may be high. The goal of this study was to investigate the relationship between the protease inhibitor [secretory leukocyte protease inhibitor (SLPI), elastase-specific inhibitor [http://www.selleckchem.com/screening/protease-inhibitor-library.html Protease Inhibitor Library ic50] (ELAFIN) and squamous cell carcinoma antigen (SCCA)] levels in gingival crevicular fluid and the number of P.?gingivalis micro-organisms in subgingival plaque. Material and Methods:? Plaque samples from subjects without (n?=?18) and with moderate to advanced periodontitis (n?=?41) were used to quantify P.?gingivalis using real-time PCR. Protease inhibitor levels [http://en.wikipedia.org/wiki/Unoprostone Unoprostone] in the gingival crevicular fluid of all the subjects were determined by ELISA. Results:?P.?gingivalis was detected in 68.3% of patients with periodontitis, while 16.7% of subjects without periodontitis had a detectable level of P.?gingivalis. Patients with periodontitis and P.?gingivalis in their plaque exhibited lower SLPI and ELAFIN levels (p?