Flashcards in Erosion Deck (43)
What are the causes of non carious TSL?
What is dental erosion?
this is the progressive loss of dental tissue causd by the chemical processes without bacterial involvement
T/F the prevalence of erosion is increasing?
esp in adolescents
WHat did the CDH survery show fo TSL affecting palatal of incisors?
1993: 5 yo: 52% affected, 24% into dentine
15 yo: 27% affected, 2% into dentine
2003: 5 yo: 53% affected, 22% into dentine
15 yo: 33% affected, 5% into dentine
What is the critical pH ?
the pH at which a soluton is just saturated with respect to a particular solid eg enamel mineral
What happens below the critical pH?
the solutuon is under saturated and this it can dossolve the solid
What happens above the critcal pH?
the solid can be precipitated out, the solution is super saturated
WHat is the critical pH dependant on?
the solubility of the solid
the concentrations of the mineral in the soluton
WHat is more soluble, HAP or FAP?
WHat is the critical pH for HAP in caries and how does this compare for FAP?
WHat is the critical pH for HAP in erosion?
there is none
since it is dependant on the saturation of the solution
What happens to the tooth as it is eroded?
it oriduces a layer of eroded calcium and phospkahte ions which surround the tooth immediatly this then increases the saturation of the solution aound the tooth and this reduces the liklihood of dissolution ocurring
WHat is titratable acidity and how does this relate to erosion?
this is the amount of strong base which is needed to neutalise a strong base and the higher the TA value the longer it can maintain its low pH when buffered or diluted
what is the pH of saliva?
what does saliva contain to aid its buffering capacity?
it contains calcium and phosphate ions
WHat is the histopath behin erosion?
when enamel is exposed to acid it becomes softened to a depth of 0.2-3microns and increased roughness which now resembles etched enamel
continued acid attack then leads to bulk mineral loss with the reamining surface being partially demineralised
this layer is much more suscwptible to loss due to physical forces
This same process affects dentine and then los of dentine volume occurs at a faster rate than enamel since it has a lower mineral content
What is the aetology behind erosion?
extrinsic acids and intrinsic
What are the intrinic sources of acid?
What is gastric reflux?
the back flow of acid into the mouth
WHat are the risk factors forr relfux?
high fat diet
What are the features associated with relfux?
WHat are the signs of eating disorder?
change in beahviour
signs of bomiting
enlatged salivary galnds
loss of mestrualcycle
WHat is anorexia nervosa?
dailure to eat in the abscence of any phyisical cause and they are more than 15% below expcted bpdy weight
what is the incidence rate for anorexia?
t/f anorexics have a distorted body image?
t/f anorexics have an intense fear of gaining weight?
WHat may anorexia be associated with?
use of laxatives
appetite supression and vomiting
what is bulimia nervosa?
recurrent episodes of binge eating followed by self indeuced vimiting
which is more common buimia or anorexia?