Caries risk: aetiology and risk Flashcards
4 factors that contribute to dental caries?
susceptible tooth surface
bacterial biofilm
time
sugar substrate
what does bacteria do to the dental biofilm that makes it more susceptible to caries?
decreases pH to 4.5-5.5
dissolution of hard dental tissues
what initiates dentinogenesis?
odontoblasts in the pulp
what does dental pulp consist of?
soft connective tissue
vasculature
lymphatics
nervous tissue
what lines the periphery of pulp chamber?
odontoblasts
name 2 bacteria associated with dental caries
strep mutans
lactobacilli
what is Koch’s postulate?
disease cannot happen without specific bacteria
this is not true!
what is Marsh’s ecological plaque hypothesis?
every person has a plaque biofilm which is capable of causing caries however it needs a niche environment to feed off
common cause of white spot lesion?
failure of brushing
plaque buildup
hall technique success at 2 years and 5 years
2 years - 98%
5 years - 92%
composite restoration success rate at 2 and 5 years
2 years - 71%
5 years - <50%
GI success rate at 2 years?
0%
what is the most important clinical event in the progression of dental caries? and why?
cavitation - difficult to remove the biofilm out of the cavity
what direction do lesions tend to spread in?
laterally
why do you not take a sharp probe to a fissure cavity?
it will open fissures and break unsupported enamel
what colour change is seen when enamel is disrupted by abrasion? and why?
clear - white/ opaque
light hitting the roughened surface gets refracted many times
why does etch make enamel appear frosty?
it demineralises the enamel
where does 99% of decay occur?
fissures
contact points
pathophysiology of dental caries?
frequent access to fermentable dietary carbohydrates leads to an established dysbiotic microbiological population of high cariogenicity which is capable of increased production of organic acids promoting dental hard tissue mineral loss
SIMD stands for?
scottish index of multiple deprivation
