Enamel Flashcards
What is the name for incremental lines?
Striae of Retzius
In which part of the crown are enamel spindles best developed?
cusp
What is the relationship of enamel spindles to dentinal tubules?
Follow on from each other
What is the relationship between the long axis of spindles and the direction of enamel prisms?
perpendicular
What are the 3 potential origins of enamel lamellae?
- developmental
- acquired
- preparation artefact
What is the relationship in the direction of tufts and that of enamel prisms?
same direction
How are tufts and spindles distinguished from each other?
tufts only found at the DEJ
spindles extend into enamel
What are the 4 zones of a carious lesion?
surface zone
body of lesion
dark zone
translucent zone
What are the 4 zones of a carious lesion?
surface zone
body of lesion
dark zone
translucent zone
What lines are parallel to the ADJ?
Incremental lines
What lines run out of the ADJ?
Prisms
What are cracked lines?
Lamellae
What do lamellae map out?
Direction of prisms
How is developmental lamellae acquired?
ameloblasts die off early on
How are acquired lamellae acquired?
crack on eating
Where do you find gnarled enamel?
at cusp tips
What is gnarled enamel?
distorted prisms
What are enamel spindles?
dentinal tubules that extend into enamel
what direction are enamel spindles?
dont follow prism direction
where are enamel tufts?
DEJ
what are enamel tufts?
hypomineralised enamel
what direction do enamel tufts run in?
follow prism direction
