Exploring the Role of GCF in the Early Detection and Monitoring of Periodontal Conditions

Gingival crevicular fluid (GCF) is a site-specific oral fluid that reflects the host–microbe interactions occurring within the gingival sulcus. Its composition changes dynamically with periodontal inflammation, making it a valuable biological medium for early diagnosis and monitoring of periodontal disease. Traditional periodontal parameters—probing depth, bleeding on probing, and radiographs—primarily detect past destruction, whereas GCF biomarkers offer real-time insight into ongoing tissue breakdown and host response. Key diagnostic molecules include inflammatory mediators (IL-1β, TNF-α, PGE₂), enzymes involved in collagen degradation (MMP-8, neutrophil elastase), and bone metabolism markers (RANKL, OPG, osteocalcin). Advancements in proteomics, metabolomics, genomics, and microRNA profiling have further expanded the diagnostic potential of GCF, enabling identification of disease-specific molecular signatures. Emerging point-of-care biosensors promise rapid chairside detection of critical biomarkers, supporting personalized treatment strategies. Despite its promise, challenges such as sampling variability, lack of standardized biomarker thresholds, and limited clinical translation persist. Integrating multi-omics data, artificial intelligence, and validated biomarker panels may overcome current limitations and position GCF as a core tool in future precision periodontology.