Chapter 25 Flashcards
What are dental caries?
Dental caries is a biofilm-mediated, diet- moduläted, multifactorial, noncommunicable, dynamic disease resulting in a net mineral loss of the hard tissues.
___bacteria produce acid as a result of metabolizing fermentable carbohydrates consumed by the individual.
Acidogenic and aciduric
When acidogenic and aciduric bacteria predominate the oral flora, the risk for dental caries increases or decreases?
increases
What are the of bacteria predominate in the caries process?
The mutans streptococci (Streptococcus mutans and Streptococcus sobrinus are two most prevalent bacteria in the group)
Lactobacillus
Actinomyces and non-Actinomyces species
Bifidobacteria (associated with early childhood caries)
Mutans streptococci are infectious organisms that colonize the teeth and help to form the dental biofilm because they___
create a sticky environment for survival and multiplication
Mutans streptococci and
Bifidobacteria are most active during the___ of demineralization and caries formation.
initial stages
lactobacilli are more active during the__ of the caries.
progression
_____of fermentable carbohydrates enhance the amount of biofilm and acid produced and results in increased demineralization.
Frequency and form
What effects does acid have on the teeth?
The acid formed passes freely into the tiny diffusion channels between the enamel rods or into the exposed root surfaces.
• Acids can dissolve the enamel crystals into calcium and phosphate ions.
• The subsurface initial carious lesion is formed and appears clinically as a white spot lesion.
_____is the process by which the minerals of the tooth structure are dissolved into solution by organic acids produced from acidogenic bacteria that metabolize fermentable carbohydrates.
Demineralization
With_____, the tooth demineralization can outpace the remineralization process. The end product of this activity is the cavitated carious lesion.
repeated bathing of the tooth surface with the acids
____is the natural repair process of moving minerals back into the subsurface of the intact enamel.
Remineralization
Function of saliva:
provides protective factors to promote remineralization like buffering of acids and clearance of bacteria and food debris and supplying minerals to replace calcium and phosphate ions dissolved from the tooth during demineralization.
____reduces buffering capacity and aids in the demineralization process.
Low saliva flow (hyposalivation or xerostomia)
Maintaining a neutral or basic saliva pH of____ is necessary to maximize remineralization.
7
After an exposure to fermentable carbohydrate, the pH drops to the critical pH of____, at which point demineralization occurs.
5.5
Exposure to topical fluoride can increase____
available salivary levels of fluoride.
Saliva is a reservoir for fluoride to aid in___.
remineralization
Fluoride accumulation in saliva comes from many sources, including____
water, dentifrice, mouthrinse, and professionally applied therapies.
What is the function of fluoride in saliva?
Inhibits demineralization
Enhances remineralization
Inhibits bacterial growth; In the biofilm, the HF diffuses through the cell membrane of acidogenic bacteria. Fluoride ions interfere with the essential enzyme activity within the bacterial cell wall.
The stages when caries development is still reversible is:
ICCMS Initial Stage Caries or CCS
Initial Caries Lesion when there is no cavitation of the lesion
The stages when caries development is irreversible is:
ICCMS Moderate Stage Caries or
CCS Moderate Caries Lesion where there is cavitation of the enamel.
ICCMS Extensive Stage Caries or
CCS Advanced Caries Lesion where the lesion extends into the dentin.
___is commonly used to assess the risk fäctors for disease so that individualized
prevention and management plans can be developed and implemented.
Risk assessment