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Caries DH

QuestionAnswer
What is a cavity bacterial infection which causes the dissolution of the tooth mineral content and the disintegration or collapse of the organic matrix
What is the prevanlent of the disease 91% of adults experience caries in their lifetime
how isthis disease transmissible human to human by saliva*
How is the caries process started it starts with bioflim
Where does biofilm develope where ever there is #1.fluid, #2.a surface,#3. Bacteria
What is biofilm Microbial communities consisting of hundreds of distinct microorganisms that cooperate with each other to adapt to change in pH or mechanical stress of motion
What increases the survival rate of the moroorganism because of the EPS(extracellular polysaccarides) Biofilm
T/F Dental caries is a multifactorial disease process with the oral microbial component being a biofilm True
What happens to oral biofilm at 96 hours/4 days it can measure to be 1mm thick*
What are the plaque formation stages 1. Initial adherence (acquired pellicle) 2. lag phase (Slow bacterial colonization) 3. Rapid Growth 4. Steady state (Mature dental biofilm)
What is invovled in the Intial adherence stage -Supragingival plaque formation precedes subgingival biofilm formation -Saliva bathes the teeth while salivary proteins and mucins cover the tooth and began "A.P." -At 1 hour bacteria attach to "A.P." -Primary colonizers=Gram+cocci
What is involved in the lag phase -Colony of gram+cocci begin to form a community of bacteria -send signals to each other to begen creating water insoluble EPS to create a protective matrix for bioflim
What is involved in the rapid Growth phase -additional bacteria enter the bacterial community forming micro-colonies within the protective matrix -COAGGREGATION=different bacterial species in the matrix and adhere to early colonizer
what is involved in the steady state every species who will live in the biofilm community are present -early colonizers(gram+)slow their growth or become static(retard)
Where is the location of the BIOfilm Teeth represent 25% of the total surface area of the mouth* -oral mucosa specialized mucosa(tongue)75% surface area in the mouth
T/F soft tissue acts as reservoir for hard tissue leading to more rapid biofilm formation True
Why is daily mechanical disruption so important B/C mature dental biofilm is very pathogenic
How pathogenic is the biofilm Disease state for caries more cariogenic bacteria account for 96% of biofilm and pH shift to acidic(below5.5)
How does Biofilm switch from healthy to carious biofilm pH
plaque(biofilm)stages Immature plaque Mature plaque
How much force does it take to mechanically remove a 24 hours biofilm Day1=5.5gm/cm 2 day=7.8gm/cm 3 day=14.0gm/cm
Which tooth surfaces develop the most plaque #1 interproximal surfaces #2 PiTs/occlusal surfaces #3 cervical 1/3 of the tooth
what are the cariogenic bacteria that are associated with coronal caries development Mutans streptococcus lactobacillus
What are the characteristics of all cariogenic bacteris #1 Acidogenic #2 Aciduric #3 capable of forming extra cellular polysaccharides(glucans/fructans) #4 caprophillic anf facultative anaerobes #5ability to adhere to the tooth surface
what is the Hydrogen Ion Pump: allows the cariogenic bacteria to live in a biofilm with an acidic pH -the hydrogen ions pumpedout into the biofilm mass and up up the pH of the biofilm even more
How does the bacteria adhere to the tooth #1 surface appendages(fimbria) #2 calcium bridging #3 Extra cellular polysaccharides(glucans) #4 hydrophilic interactions
Caries process 1.host 2. environment 3. bacteria 4.time
the caries Imbalance #1 protective factors #2 pathological factors #3 Disease indicators
What are ESP Complex Sugars
cariogenic bacteria + CHO = ACID+extra-cellular polysacccharide
name the types of acids(cariogenic Bateria produce) lactic acid acetic propionic formic succinic
What does plaque acids do -causes demineralization -demineralization creates a subsurface lesion -Demineralization causes the enamel crystals size to lower and up the inter crystalline space( increase micropores)
T/F when thw plaque biofilm favors the demineralization process cavities occur true
T/F when the plaque biofilm favors the rem. process incipient lesions'heal' or decay becomes arrested or dont occur at all true
Dentist estimate -6 mos to 1 year primary enamel -1-2 years permanent enamel
studies demonstrate 4yrs for children age 10-11 7yrs for young adults aged 17-22 6yrs for adults ages 41-51
the darker the lesion the slower the progressing lesion and the more remin/demin cycles
the lighter the lesion the more rapid progressing lesion and the fewer remin/demin
Created by: SYWallace0314 on 2011-09-29



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