Caries 2

Question 1

what is the acidogenic theory

Answer 1

two stage process which involves the decalcification of enamel and then the destruction of dentine when sugars are converted to acid by plaque bacteria

Question 2

what is the Proteolytic Theory

Answer 2

organic portion of the enamel or dentine is destroyed by proteolytic enzymes from plaque bacteria

Question 3

The Proteolytic Chelation Theory

Answer 3

amino acids break down the protein element of the tooth by proteolytic enzymes in plaque bacteria

Question 4

The stephan curve shows

Answer 4

That it takes 1-3 mins for ph to fall below 5 . and 30-60 mins for it to return to normal fluoridated enamel demineralises at PH 4.5 and non fluoridated enamel will demineralise at PH 5.5. Repeated falls of ph in the mouth causes demineralisation

Question 5

demineralisation is caused by?

Answer 5

repeated falls of PH in the mouth

Question 6

Non-fluoridated enamel will start to demineralise at pH?

Answer 6

5.5

Question 7

Fluoridated enamel will start to demineralise at pH

Answer 7

4.5