Positron emission tomography (PET) is a functional imaging technique that uses radioactive substances known as radiotracers to visualize and measure changes in metabolic processes, and in other physiological activities including blood flow, regional chemical composition, and absorption. Different tracers are used for various imaging purposes, depending on the target process within the body. For example, 18F-FDG is commonly used to detect cancer, NaF-F18 is widely used for detecting bone formation, and oxygen-15 is sometimes used to measure blood flow.PET is a common imaging technique, a...

Gingival crevicular fluid (GCF) is an inflammatory exudate derived from the periodontal tissues. It mainly consists of substances derived from serum, leukocytes, bacteria, activated epithelial cells, connective tissue cells, and bone cells as these possess a great potential for serving as indicators of periodontal disease and healing after therapy. GCF plays a special part in maintaining the structure of junctional epithelium and the antimicrobial defense of periodontium. Analysis of periodontal condition can be easily done by collection of GCF which is a non-invasive and relatively simple...