5 - Cariology Flashcards
is dental caries an infectious, communicabe, disease process
yes
what is a post-eruptive disease process
dental caries
microorganisms (for caries) are acquired from where
the environment (mainly infant caregivers)
3 main factors of caries
- tooth
- dental plaque
- diet (refined carbs)
without all three, caries is not possible
influences that affect the 3 main factor of caries
time, fluoride, and saliva
also: education, socioeconomic status, and behavior
what are the parts of microbial biofilm
- acquired pellicle
- bacteria
- matrix
what is a coating derived from saliva and deposits shortly after eruption
acquired pellicle
what is acellular and consists of salilvary glycoproteins
acquired pellicle
how long does it take for acquired pellicle to mature
7 days
what is the acquired pellicle colonized by
oral bacteria
where are bacteria most abundant
stagnant areas (proximal surfaces, pits, fissures)
what bacteria colonize as plaque matures and oxygen penetration decreases (gram negaive rods and cocci)
anaerobic bacteria
what are organic and inorganic components derived from bacteria
matrix
what its a major component of matrix
polysaccharides
what are minor components of matrix
salivary and serum proteins and glycoproteins
what is the process of bacterial metabolism - causes acidogenesis (lactic acid)
anaerobic glycolysis
what is pH change in plaque metabolism
7.0 to 4.5
when does enamel begin to demineralize
5.0 to 5.5
when eating, the drop in pH occurs for how many minutes
30 minutes
T/F: quality of food is more important than frequency
FALSE! frequency is more important than quality
what are secondary (recurrent) caries
on tooth surface at margin of existing restoration. caused by same bacteria that cause primary caries. this is the most common reason for restoration replacement
what are the 3 stages of carious lesion development
- incipient - can be arrested or reversed
- demineralization to and past DEJ
- overt or frank - cavitation present, operative intervention necssary
what do pit and fissure caries look like when spread
what do interproximal caries look like hwen spread
do all white spot lesions lead to cavities
YES
what are zones of incipient lesion from surface
- surface zone
- body of lesion
- dark zone
- translucent zone
what zone:
Deepest part of the lesion.
Advancing part of the lesion.
Slight demineralization.
1% pore space.
translucent zone
what zone:
Pore space of 2-4%.
Deepest part of the lesion that can be
re-mineralized.
dark zone
what zone:
Pore space of 5-25%
Remanents of enamel crystals
still maintain orientation in the
protein matrix.
body of lesion
what zone:
Pore space 1%
Can be re-mineralized.
If no re-mineralization occurs, the
surface zone becomes
undermined and collapses. The
lesion is then no longer incipient.
surface zone
what are the five zones of carious dentin
- destruction - closest to DEJ
- penetration
- demineralization
- translucency
- reactionary dentin or sclerotic
what is deposited y the pulp in response to irritation (amorphous)
reactionary dentin
what are non-vital calcific tracts of dentinal tubules
sclerotic tubules
clinical appearance of active lesion
white, chalky or dull, rough, porous
clinical appearance of inactive lesion
white to black, shiny, smooth, hard
if lesion is shiny and hard, do you need to remove it?
nO
what are the cariogenic bacteria
s. mutans gram +
l. casei gram +
what is the primary colonizer of acquired pellicle
s. mutans
