INBDE Operative Dentistry UPDATED ACTUAL Questions and CORRECT Answers

INBDE Operative Dentistry UPDATED ACTUAL Questions and
CORRECT Answers

, Carbonate-Substituted Hydroxyapatite What is the main ingredient of dentin and enamel?


the CO3 is added to the mix


CHA


white powder, with low bioresprption rate What is hydroxyapatite?


Possess a "Key-Hole" Pattern with "Head" and "Tail" Enamel Rods


enamel rod has a head and tail the IS more more organic
and ha less mineral content so easier to decay


"Tail" which makes it MORE SUSCEPTIBLE to caries In Enamel Rods, is "Head" or "Tail" more organic


Makes it MORE SOLUBLE and thus MORE SUSCEPTIBLE How does Carbonate affect Hydroxyapatite?
to Caries




1. No Is Enamel the same all across the tooth?
2. CHA is CLOSER to the DEJ
3. FA is CLOSER to the SURFACE of Enamel




1. Hydroxyapatite is in constant balance between it and How is caries formed?
Ca2+ and (PO4)3-
2. When Sugar is consumed, Cariogenic Bacteria perform
Fermentation, releasing H+, which combines with (PO4)3-
to form Phosphoric Acid
3. This drives rxn to form more Ca2+ and (PO4)3-, which
causes Demineralization


5.5 What is the Critical pH of Carbonate-Replaced Hydroxyapatite?


E(CHA)


4.5 What is the Critical pH of Fluorapatite?


it takes a stronger acid challenge to get below and cause Enamel(F)
demineralization


6.2-6.7 What is the Critical pH of Dentin/Cementum?


its alot more sensitive the. these surfaces are way more
vulnerable to acid challenges