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ground section

oral cavity

4) surface zone of decomposed dentin

dentin caries lesion

3) decalcied matrix with bacteria in tubules

2) zone of sclerotic dentin where mineral

  • lls tubules & optical

distinction between tubules & matrix lost

pulp

X13

1) dead tracts: tubules containing degenerating odontoblastic processes

DEJ is weak point exploited by pathogens

visible on PBWs as D1 lesion

destruction spreads laterally at DEJ

this effectively uncouples the enamel and dentin

breakdown in surface integrity linked to lesion reaching DEJ

enamel lesion contact area cavitation

cavitated lesion at contact area

the pulp responds as soon as the lesion enters the dentin

pulp

dentin

X36

inammation: diffuse lymphocyte inltrate

infected tubules

ground section

dead

decomposed

tracts

dentin

caries lesion extending into dentin

infected dentin

sclerotic dentin

X13

dead tracts

enamel becomes brittle when decoupled from dentin

lateral spread of lesion at DEJ leads to unsupported enamel peripheral to cavity

this is why a prepared cavity should contain no stain at DEJ

7

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