test 2, caries microbiology part 2 Flashcards
What can be done to prevent and control caries?
focus on the environmental control of the microflora by stimulation of non-mutans (high pH) bacteria.
are non-MS and actinomyces aciduri and acidogenic?
yes
is it the genotype or phenotype of these bacteria that can lead to a shift that allows caries?
phenotype
are dentinal caries very structured/consistent?
no, under suitable conditions they can arrest and even regress.
clinically active dentinal caries appear……
soft and wet
arrested or slow dentinal caries appear…..
leathery and hard
what are the 2 defense reactions dentin utilizes?
sclerotic and teritiary dentin
root caries are more vulerable to mechanical and chemical destruction why?
theres no enamel to protect it
whats a major pre-requisite that needs to occur to have root caries?
recession
T/F, the consistency is less of an indicator than the color
false, it is more of an indicator
T/F, the surface zone of a root caries is hypermineralized which is precipitation from the saliva.
T, below the root caries however there is tubular sclerosis and sclerotic dentin
which caries are quicker to penetrate the tissue, root caries or coronal?
root
why does plaque stick to cementum easier?
because its rougher than enamel
recurrent caries definition
primary caries next to a restoration caused by the biofilm at the margin.
what are residual caries?
demineralized and infected tissue left by the dentist during preparation. ( called indirect pulp capping”
why are dental caries brown?
- their exogenous stains absorbed from the mouth
- pigment is produced from the bacteria
- Product of a chemical reaction when proteins are broken down with sugars (think of a cut apple)
define a diagnosis
identifying a disease from signs and symptoms.
what are signs.
the the dr. notices
what are symptoms
what the patient notices
the carious process occurs in the _____ and the carious lesion occurs on the ___
biofilm, tooth surface
why is diagnosing important
- its the basis for making treatment decisions
- informing and educating patients.
- advising healthcare service planners
Caries for convenience are graded with D for decay and numbers 1-4 which mean?
1- enamel lesions with intact surface
- enamel lesions with cavity
- lesions in dentin
- lesions in pulp
What purpose does the “iceberg of dental caries” serve?
decision making when surgical intervention is needed
at which level does the iceberge tell us surgical intervention is needed?
D3 and D4
what 3 things are necessary for detecting caries?
good lighting and clean dry teeth, radiographs
should you remove the plaque before looking for caries?
no, caries occur within the plaque biofilm so it can help you evaluate the activity of certain lesions
active lesions on smooth surfaces usually are covered with plaque close to the gingival margin and have a ____ appearance and feel ____
MATT, rough
arrested lesions are usually free of plaque and have a ____ appearance and may have stained porosites from exogenous debris
shiny and lustrous
active root caries lesions are usually covered in plaque and are ________ and can be cavitated
soft and leathery
arrested root lesions are usually _____ and _____ and located in plaque free zones and can be cavitated also
hard, shiny
