CATEGORY AUSTRALASIAN DENTIST83 CLINICAL capillaries. It was further shown that, in a state of acute in ammation, these particles can be found; in a healthy state, the vessels are organized in layers and close to gingival crevicular epithelium, whereas, in diseased or in ammation states, the layers are replaced by a loop form12. Furthermore, a series of experiments was performed, and it was concluded that capillary permeability varied according to the stimulus given and signi cantly increased in an in amed state. is capillary permeability occasionally responded in a healthy state while chemomechanical massaging of the gingivae also showed changes. It was noted that there was a remarkable rise in pH of gingival sulcus as periodontitis developed, marked around 8.5. e rise in pH is associated with the destruction of proteins by bacteria in the sulcus. Ammonium that is basic in nature is produced as a by-product after the degradation of proteins and is thought to be the reason for the increase in pH of the crevicular sulcus. Other factors that are found to play a role in the progression from a healthy to a diseased state includes the oxygen level, the temperature, the redox potential, and the osmotic pressure9. Nature has provided the periodontium with connective tissue that is enriched with cellular and molecular components of blood; hence, gingival sulcus is consistently bathed by GCF13. is crevicular uid provide a channel for the transportation of bacterial by-products into periodontium, as well as help to drive o host-derived byproducts14. Many methods are available for the collection of GCF such as Intrasulcular and extrasulcular (see Figure 3) with the help of paper strips, capillary tubes, micropipette, gingival wash, and paper cones5. Other methods include using platinum loops, plastic strips, and paper points. In the last decade, researchers have favoured using the paper strip in their research work due to easy insertion into a gingival crevice up to 1 mm of depth without bleeding from periodontal pockets15. 2. GCF as a Diagnostic Tool for Analysis of Oral Diseases e oral cavity is a reservoir of the microbiome and harbours them, when unfavourable changes occur within the oral cavity; it results in pathological changes, and hence suggests that this analysis can assist us in knowing pathogenesis of the periodontal disease22. Tsuchida et al. collected GCFs from a healthy patient and compared them with patients having mild to moderate periodontal disease and with a patient su ering from the severe periodontal disease. e gel-free proteomic approach was used, and GCFs were labelled by a reagent called as Tandem Mass Tags (TMTs). In this method, 619 proteins were analyzed from the above-mentioned samples. eir reports showed, in severe periodontitis, higher amounts of lipocalin2 (LCN2) and matrix metalloproteinase-9 (MMP-9) were expressed. Furthermore, Pisano et al. worked on the peptides of GCF by using HPLC-ESI-MS and detected a high concentration of α-defensins, and small amounts of cystatin-A, basic PB peptides, and statherin were also detected20. External root resorption is a universal phenomenon that is associated with many factors such as trauma, orthodontic tooth movement periodontal disease, and physiological shedding of deciduous teeth. Rody Jr et al. worked to identify the biomarkers in GCF by using LC-MS (liquid chromatography-mass spectrometry). He postulated 2789 proteins in a control group, and 2421 proteins in resorption samples were identi ed. erefore, these biomarkers can provide us with a new possible tool for the early detection of external root resorption so that orthodontic tooth movement should avoided, and other conditions mentioned above will better be managed23. Orthodontics is one of the major subspecialties of dentistry that deals with the management of malposition teeth and the jaws. Certain studies were conducted to assess changes within GCF during orthodontic tooth movement24. Initially, when orthodontic force is applied to allow tooth movement to occur, certain metabolic changes occur within periodontium along with the process of bone remodeling that includes some osteoblastic and osteoclastic activity. is biological and physiological process results in acute in ammatory response that occurs within periodontal space. Lactate dehydrogenase, an important enzyme that is released out after cell death, was reported as a potential marker, as its level was found to be elevated within GCF during orthodontic treatment. Serra et al. demonstrated the LDH level in GCF during the early stage of orthodontic treatment and formulated that, when orthodontic force is applied, the periodontium either goes under tension or compression, resulting in cell death. As hypothesized, the LDH level in GCF was elevated in those sites enduring orthodontic force and was independent of age and sex25. Bone cells are deposited at Factors Description Mechanical Chewing coarse foods, vigorous brushing and gingival massage are known to increase GCF production Circadian periodicity. The amount of GCF increases gradually from 6 a.m. to 10 p.m. and it decreases after that Periodontal surgeries GCF production increases after periodontal surgeries during the healing period Smoking. Smoking increases GCF flow. This increase in GCF due to smoking is immediate and transient Table 1. Description of factors affecting the amount of GCF in the human oral cavity. Figure 3. Illustration representing the different approaches of collecting gingival crevicular fluids (GCFs) from the oral cavity. (a) Intrasulcular approach; (b, c) Extrasulcular approach. such as gingivitis, periodontitis, and dental caries16,17. GCF, as a biomonitoring uid, plays a constructive role in the diagnosis of oral diseases, especially for periodontitis and gingivitis. Its limited amount compromises the biochemical and proteomic analysis, and the severity of in ammation in periodontium a ects its collection15. e introduction of mass spectrometry, with highly sensitive techniques, helping in the detection of protein and their components within many biological samples18. Its non-invasive collection technique helps in a sampling of any age group of human subjects and the attraction of allowing multiple sites for the sampling within the oral cavity. Until now, various in ammatory factors have been isolated from GCF, including cytokines, phosphatase, proteinase, local tissue degradation products, and proteins19. ese factors have been reported to be possible diagnostic markers in periodontitis. GCF not only can be a future diagnostic tool in the identi cation of periodontitis but also can aid in detecting the progression of this disease. Early detection of periodontitis progression can be clinically useful by providing better control of disease activity and can improve patient monitoring20. erefore, collecting GCF from multiple sites can aid in identifying high susceptibility for disease activity on those sites, the targeted risk site can be managed properly, and further progression of the disease can be controlled21. Huynh et al. studied the proteomic composition of GCF in healthy periodontium and compared them with proteome present in GCF of patients with gingivitis and chronic periodontitis. e GCF proteome analyzed was found di erent in each clinical condition
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