dental plaque

Dental plaque
Dr. Baha, Hamdi. AL-Amiedi
Ph. D. Microbiology
Dental plaque
it is now well established that caries & periodontal disease are infectious disease associated with resident microorganisms of dental plaque there are two hypothesis explain that:
The specific plaque hypothesis: proposes that only a few microorganisms are involved in the oral disease process
Non – specific plaque hypothesis: considers that disease result from the interaction of the hole plaque with host
there are serveral organic deposits on the surface of the teeth these deposits include dental plaque, material alba, pellicle, calculus deposits,
materia alba: so it is the outer portion of dental plaque is composed of an unorganized
structure of microbial growth and desquamated epithelial &white &red blood cells loosely to organized structural portion of plaque and is easily removed by mechanical action of water spray. but if it with stand the water spray it is called dental plaque
Dental plaque
It is a general terms for the complex
microbial community found on the tooth surface , embedded in a matrix of polymers derived from bacteria & saliva. For successful colonization microorganism must first adhere to
a surface this involve interaction between a dhesins on the microbial surface and ligand s on the host surface
Dental plaque formation:
adherence to a surface in the mouth is essential for survival of oral bacteria.in the cause of supra gingival plaque formation,
Microorganism interact with a layer of material on tooth surface called pellicle comprises mucins, salivary glycoproteins,
Minerals &immunoglobulin, the pellical formation occurs in seconds on cleaned enamel and reaches a maximum thickness in 90-120 minutes