VM enamel Flashcards
dark areas are?
less mineralised
areas that are more mineralised appear?
lighter
what are these lines
striae of retzius
incremental growth lines
what are these wiggly lines at the tooth cusp?
gnarled enamel prisms at the cusp to resist fracture
what is it called where the dentine meets the enamel?
amelodentinal junction
what are enamel spindles?
dentinal tubules that run into enamel
in which part of the crown are enamel spindles most developed?
at the cusps
is there a relationship between direction of enamel spindles and enamel prisms?
no
what are these two structures?
ADJ
enamel prisms at cervical region
what is this line?
horizontal section
striae of retzius
what is this structure on horizontal tooth section?
lamellae
how do you know if its lamellae?
line from the ADJ to end of enamel
what are the 3 possible origins of enamel lamellae?
developmental- not formed properly and has more protein
acquired (fracture line)
cracks formed during preparation
what is this structure?
enamel tuft
is there a relationship between the direction of the tufts and enamel prisms?
follow direction of enamel prisms
how are tufts and spindles distinguished?
tufts are branched
what are enamel tufts?
Hypomineralised areas at the ADJ where enamel has not quite formed yet
what are these light and dark bands? what do they do?
hunter-schreger bands
give strength and fracture resistance
look at this decalcified enamel
what is the stained material likely to be?
residual epithelial proteins left over from development
look at this decalcified enamel
what are these 2 structures?
prisms in cross section
longitudinal prisms
what does this image show?
early occlusal fissure caries
look at these zones of demineralisation
