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While gingival crevicular fluid provides for the cellular defence and humoral factors to combat against the microbial insult, the gingival crevicular fluid also deliver novel substrates, in the form of proteins and glycoproteins, for bacterial metabolism. These include haeme containing molecules and iron, such as haemoglobin and transferrin.
Oxytalan fibers are unique to the PDL and are elastic in nature. It inserts into cementum and runs in two directions: parallel to root surface and oblique to root surface. The function is thought to maintain the patency of blood vessels during occlusal loading. Further research is needed to determine the function of oxytalan fibers. [4]
It is caused by precipitation of minerals from saliva and gingival crevicular fluid (GCF) in plaque on the teeth. This process of precipitation kills the bacterial cells within dental plaque, but the rough and hardened surface that is formed provides an ideal surface for further plaque formation.
They migrate from the tissues in a specialized exudate called gingival crevicular fluid also known as GCF. Neutrophils are recruited to the gingival crevice area as they are signalled to by molecules released by plaque microorganisms. Damage to epithelial cells releases cytokines which attract leukocytes to assist with the inflammatory response.
In addition to acting as a buffer, saliva and gingival crevicular fluid contain primary nutrients including amino acids, proteins and glycoproteins. This feeds the bacteria involved in plaque formation. The host diet plays only a minor role in providing nutrients for the resident microflora. [20]
In theory, gingival fibers are the protectors against periodontitis, as once they are breached, they cannot be regenerated.When destroyed, the gingival sulcus (labelled G in the diagram) increases in depth apically, allowing more debris and bacteria to remain in intimate contact with the delicate sulcular and junctional epithelia for longer times.
The gingival tissue forms a crevice surrounding the tooth, similar to a miniature, fluid-filled moat, wherein food debris, endogenous and exogenous cells, and chemicals float. The depth of this crevice, known as a sulcus , is in a constant state of flux due to microbial invasion and subsequent immune response.
Apart from microorganisms, these aerosols may consist of particles from saliva, gingival crevicular fluid, blood, dental plaque, calculus, tooth debris, oronasal secretions, oil from dental handpieces, and micro-particles from grinding of the teeth and dental materials. [8]
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