DENTAL ANATOMY HUNTER SCHRUGER BANDS- white & dark lines in enamel appearing in longitudinal section- enamal rods change their direction. ENAMEL SPINDLES- Extension of odontoblasts that cross DEJ, extend into the enamel Specific gravity of enamel is – 2.8 Density of enamel crystal is the lowest at – Edge of enamel prisms Dentine permeability –decreased by smear layer, increases towards the DEJ Critical PH at which enamel start to demineralization is: 5. The pH the enamel make complete remineralization: 5.5 or above. Complete remineralization occur after 24 hours ph of saliva 6.5ZONES OF ENAMEL CARIESSURFACE ZONEBODY OF THE LESIONDARK ZONETRANSLUCENT ZONEZONES OF DENTINAL CARIESNORMAL DENTINSUBTRANSPARENT DENTIN (AFFECTED)TRANSPARENT DENTINTURBID DENTIN (INFECTED)INFECTED / NECROTIC DENTIN

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