PREVENTION II . “CARIOLOGY’. HISTORICAL OVERVIEW. General understanding of cause of dental caries has not changed since Miller developed the chemoparasitic theory over 100 years ago: Acid is produced by metabolism of dietary carbohydrates by oral bacteria.
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Approximately twenty minutes after ingestion of sucrose, and once the supply of fermentable nutrients is exhausted, the bacterial will cease to produce acids and the plaque pH will gradually return to a slightly alkaline resting level.
#1 SURFACE ZONEOne of the the fascinating features of this initial lesion of caries is that most of the demineralization begins to occur at a subsurface level, leaving the surface zone relatively unaffected.
#2 BODY OF THE LESION
This is the largest portion of carious enamel in the white spot lesion.
It has often lost one-quarter of its original mineral content.
#3 DARK ZONE
This zone is very porous, and has experienced
a mineral loss of about 6%.
#4 TRANSULENT ZONE
This is the advancing front of the enamel lesion. It is more porous than sound enamel but less porous than the dark zone.