Tooth Decay and Stuff. Tooth Decay. Tooth decay has been present since there have been teeth to decay. Tooth decay, is an infectious disease that damages the structures of teeth Pain Tooth Loss Infection Death. The Chemistry. Tooth decay is Acid/Base chemistry
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Ca5(PO4)3OH(s) (Tooth enamel) + H+ (Acid) (aq) → Ca5(PO4)3+(aq) + H2O(l)
Reaction is reversible: saliva
Ca5(PO4)3+(aq) + F-(aq) → Ca5(PO4)3F (s)
Dental material used to restore the function/integrity/morphology of missing tooth structure
-Indirect and direct restoration
-Numerous types of methods
An amalgam is a mixture of mercury with another metal or alloy.
Most metals are soluble in mercury.
Amalgams are commonly used in dental fillings.
Dental amalgam consists of three solid phases represented by Ag2Hg3, Ag3Sn, Sn8Hg
~6% maximum, copper
~2% minimum, zinc
~25% maximum, tin
~45% liquid mercury
-Amalgams withstand chewing loads
-Useful for restoring molars in the back of the mouth
-They are well tolerated by patients, rare occurrences of allergic response.