Flashcards in Lecture 3 - Microbiology of Dental Caries Deck (22):
site of most common caries?
pit and fissure caries
diet-related caries is associated with?
smooth surface and proximal caries
caries found in patients with exposed root surface?
caries found at restoration margins?
T/F when bodys remineralization cant keep up with bacterial acid production, net loss of tooth structure
T/F bacteria living in biofilms on surface of tooth produce lactic acid from glycolysis of sugars
T/F tooth surface is stabilized by pellicle proteins.
initial demineralization is above the surface, leaving a thin shell of enamel overlying the body of lesion.
F - subsurface initial demineralization
occurs when subsurface demineralization becomes too severe or extraordinary force is applied to surface
as long as surface is retained, ________ of lesion is possible.
T/F biological repair is always possible
F - not possible once cavitation occurs
T/F virgin enamel is stronger than remineralized tooth structure because of incorporation of fluoride into hydroxyappatite crystal structure
F - remineralized tooth structure is stronger
properties of caries causing bacteria
1 attach and form biofilm
2 produce acid (ACIDOGENIC)
3 survive acid (ACIDURIC)
4 continue to produce acid at low pH
which species are responsible for caries intitiation?
1. strep mutans
2 s. sobrinus; s. salivarius
3. veillonella - metabolizes lactic acid
which species are responsible for caries progression?
1. s. mutans
2. lactobacillus casei, rhamnosus, gasseri, fermentum (all are different lactobacilli)
3. bifidobacterium and scardovia
acid tolerant = "__________" which means what?
can survive low pH
acid producing = "____________" meaning what?
drives pH down
which bacterium ferments sugars better at low pH? at high pH?
high pH: s. sanguis is better than s. mutans
low pH: s. mutans is better
T/F healthy bacteria stop growing at high pH. They grow and make acid at low pH
F - low pH
F - high pH
T/F caries bacteria make acid best at low pH
what is short term effect of sugar consumption?
drop in pH
T/F as you increase your eating frequency, your plaque mass increases.