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32 Cards in this Set
- Front
- Back
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Types of soft dental deposits
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acquired pellicle
microbial plaque materia alba food debris |
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acquired pellicle
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thin protein film. derived supragingivally from saliva and subgingivally from gingival sulcus fluid. It is ACELLULAR and reforms in minutes after removal
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Characteristics of pellicle
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protective barrier against acids, lubrication, nidus for bacteria, mode for calculus attatchment
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biofilm
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dense, organized, non calcified. Adhere firmly to acquired pellicle. It reforms daily.
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Only way biofilm can be removed
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mechanically
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The basic steps of plaque formation
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1. pellicle formation
2. bacterial colonization 3. plaque maturation |
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composition of plaque
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80% water and 20% organic and inorganic solids
of the solis 70% is MO and 30% is intercellular matrix |
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What composes intercellular matrix of plaque
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Ca and P and flouride
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what composes organic elements of plaque
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Carbs made from sucrose, proteins, and lipids
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pathogenic effects of bacterial plaque (biofilm)
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1. cariogenic
2. periodontal disease 3. calculoenic |
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caries formation
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cariogenic food
plaque acid formation decalcification caries |
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ways to detect bacterial plaque
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1. direct vision
2. explorer 3. disclosing agent 4. gingival color change |
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material alba
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visible soft mix of salivary proteins, bacterial and epithelial cells. Loosely attached to plaque, or tooth surface. It can coome off with forceful water spray
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Where is food debris retained?
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occlusion
anantomy of tooth appliances open contacts restorations |
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hard dental deposits
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calculas
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what alwyas covers calculas
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plaque
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formation of calculus
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1. pellicle formation
2. plaque formation and matureatin 3 mineralization |
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mechanism of mineralization
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same for supra and subgingival but they mineralize seperately.
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rate of calculus formation
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12 days
but can begin within 24-48 hours!!!!! |
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What seperates calculus layers?
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seperated by a pellicle and the outer layer is covered by plaque
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source of supragingival calculus
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saliva
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color of supragingival calculus
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white, creamy yellow
very bulky, moderatley hard |
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radiograph of supragingival calculus
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very dense visbile causes a calculus bridge
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source of subgingival calculus
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gingival sulcular flid and inflammatiory exudate
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color of subgingival calculus
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light or dark brown, greeen, or black. stain is due to blood pigments
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what is hard subgingival or supragingivla calculus?
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subgingival.
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Radiograph of subgingival calculus
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can see it interproximally
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composition of calculus
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75-85% inorganic
Ca, P, carbonate, Na, Mg, K, crystals which is 2/3 of the inorgainic material |
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organic portion of calculas
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microbes, wbcs, epithelial cells, and salivary mucins
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does calculus cause pocket?
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NO calculus is the result of pockets. plaque causes pocket
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calculus detection
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visulual with air
gingival color change tactile disclosant transillumination radiograph |
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purpose of plaque index
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1. help recoginize oral problem
2. revel degree of oral hygiene effectiveness 3. motivate pt to eliminate disease 4. evaluate success over a period of time by comparison 5. make pt own his/her disease |
