March
April 2009
abfraction is the loss of tooth structure from flexural forces.
as teeth flex under pressure, the arrangement of teeth touching each other, known as occlusion, causes tension on one side of the tooth and compression on the other side of the tooth.
this is believed to cause V-shaped depressions on the side under tension and C-shaped depressions on the side under compression.
when tooth destruction occurs at the roots of teeth, the process is referred to as internal resorption, when caused by cells within the pulp, or external resorption, when caused by cells in the period
discoloration of teeth may result from bacteria stains, tobacco, tea, coffee, foods with an abundance of chlorophyll, restorative materials, and medications.
stains from bacteria may cause colors varying from green to black to orange. Green stains also result from foods with chlorophyll or excessive exposure to copper or nickel.
amalgam, a common dental restorative material, may turn adjacent areas of teeth black or gray.
chlorhexidine, a mouthwash, is associated with causing yellow-brown stains near the gingiva on teeth.
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