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32 Cards in this Set
- Front
- Back
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Soft deposits |
Acquired pellicle Dental biofilm Materia alba Food debris |
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Acquired pellicle |
Thin acellular, tenacious film formed of protein, carbs and lipids Positioned between tooth and oral environment. Also over exposed tooth surface and protheses. Thickest near gingiva margin. |
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Acquired pellicle |
Supra gingival and subgingival in crevicular fluid. Can remove with tooth brush. |
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How fast does a pellicle form. |
Fully formed within 30-90 min. Composition glycoproteins that are selectively absorbed by hydroxyapitite of tooth surface. Proteins derived from saliva, oral mucosal cells, GCF, and microorganisms. |
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How many types of pellicle are there |
2 Supra and sub ginguval. |
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Supragingival |
Clear, translucent, insuluble Not visible until disclosing tablet is applied. Can appeared stained. |
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Subgingival |
Continuous with supragingival pellicle becomes embedded in tooth structure especially on demineralized surfaces or rough surfaces caused by iatrogenic dentistry. |
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Significance of pellicle |
Protection lubrication Nidus for bacteria (provides method of adherence of microorganisms) Attachment of calc |
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Dental biofilm |
Dynamic structured community of microorganisms encapsulated in a self-produced extracellular polymeric substance for a matrix around micro colonies. |
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EpS |
Extracellular polymeric substance like a glue that holds everything g together and makes it harder to remove |
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How can you remove biofilm |
Good home care usually but not always. |
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Matrix |
Polysaccharides and proteins Protects biofilm from hosts immune response. , adapt and respond to enviroment. 3D helps it adapt and communicate, adapt and respond to enviroment.Biofilm adheres to living moist surfaces(tongue tonsils, pellicle)700 distinct bacteria Biofilm adheres to living moist surfaces(tongue tonsils, pellicle) (tongue tonsils, pellicle)700 distinct bacteria 700 distinct bacteria |
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5 stages of biofilm |
Formation Bacteria multiplication and colonization Matrix formation Biofilm growth Maturation |
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Formation |
Begins with the initial attachment of planktonic bacterial cells to pellicle on tooth surface by way of interaction with pellicle Reversible-cells can be disrupted May resume planktonic life and either begin formation somewhere else. |
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Bacteria multiplication and colonization |
If not removed the planktonic microorganisms will attach themselves permanently using fimbrea, pili, flagella, and adhesion protiens. Grow in layers up and out 3d Use EPS so they are hard to remove. |
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Attachment is quiker? |
On rough surfaces. |
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Matrix formation |
Bacteria continues to secrete EPS as they form. EPS anchors bacteria together increasing adherence to teeth. Resists weak oral hygiene. And antimicrobial therapy |
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Biofilm growth |
Characterized by further development of biofilm architecture that enhances cell to cell communication. Activated by specific genes located on surface of bacteria cells within biofilm called quarum sensing |
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Maturation |
Bacteria colonies mature and release planktonic cells to spread and colonize other areas in the oral cavity. Bacteria can disperse in clumps and single cells. |
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Gingivitis |
Develops in 2-3 weeks when biofilm is left undisturbed on tooth surface. It is reversible. Gingiva healthy again in a few days |
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Subgingival and supragingival biofilm |
Subgingival biofilm results from supragingival biofilm Supragingival biofilm proliferates apically. Subgingival biofilm may invade connective tissue. |
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Composition of biofilm |
80% water 20% EPS and microorganisms both inorganic and organic elements. |
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Inorganic elements |
Calcium and phosphorus and floride(gets into the biofilm and pellicle) |
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Organic elements |
Carbs(sticky) adds to biofilm tenacity. Proteins(originate from gingival crevicular fluid. |
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Detection of biofilm |
Direct vision. Explorer or probe Disclosing agent Clinical record(location, thickness,biofilm, scores) |
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Biofilm |
Plays a major role in ignition and progression of dental caries and disease. Formation of calc. Inpleadent malod9r and appearance. |
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Dental caries |
Disease of dental calcified structures characterized by deminerilization of mineral components and dissolution of organic matrix. |
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PH of biofilm |
Acid formation begins immediately when carcinogenic substance is taken into biofilm. Biofilm ph lowers quickly. Critical ph level for demin is 4.5-5.5 Root surface demin happens at 6-6.7ph |
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Distribution of biofilm |
Location= supragingival, gingival, fissure,subgingival. Heaviest at gingival third and interpoximal spaces. Influencing factors: crowding teeth, rough surface, occlusion. |
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Materia alba |
White material cottage cheese texture and appearance. Composed of food debris and dead cells . Contributes to inflammation can cover demin and materia alba |
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Food debris |
Collects at cervical 3rd and embrassure. Food impaction |
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Documentation |
Clinical description Client understanding Clients description of methods to remove biofilm. |
