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visible on PBWs as E2 lesion

decomposed dentin

decalcified dentin bacteria in tubules

sclerosed dentin

dead tracts

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Dentinal Lesion

  • decay progresses slowly through enamel & quickly through dentin

  • enamel is 99% mineral, whereas dentin is a living tissue with 30% organic content

  • salivary buffers are more potent at the enamel surface than deeper in the dentin

  • dentinal lesion is more isolated from the diluting effects of the saliva

  • in dentinal lesion low pH is more steady

  • this selects more strongly for aciduric organisms (LB)

  • low pH demineralizes dentin & denatures collagen (gelatin)

  • proteolytic organisms increase in prominence

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5

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