Lecture 3 - Microbiology of Dental Caries Flashcards
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?
root caries
caries found at restoration margins?
secondary caries
T/F when bodys remineralization cant keep up with bacterial acid production, net loss of tooth structure
T
T/F bacteria living in biofilms on surface of tooth produce lactic acid from glycolysis of sugars
T
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.
T
F - subsurface initial demineralization
occurs when subsurface demineralization becomes too severe or extraordinary force is applied to surface
cavitation
as long as surface is retained, ________ of lesion is possible.
remineralization
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 2 3 4
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?
- strep mutans
2 s. sobrinus; s. salivarius - veillonella - metabolizes lactic acid
- actinomyces?
which species are responsible for caries progression?
- s. mutans
- lactobacillus casei, rhamnosus, gasseri, fermentum (all are different lactobacilli)
- bifidobacterium and scardovia
acid tolerant = “__________” which means what?
aciduric
can survive low pH
