Histology of Enamel Flashcards
What percentage of enamel is made up of water and organic materials?
4%
What is the organic material f enamel mostly made up of?
Non collagenous protein
Name the mineral that makes up enamel
Hydroxyapatite
What is eta difference between hydroxyapatite crystals in enamel compared to the rest of the body?
AThe apatite crystals in enamel are much larger
What does the enamel form?
A hard wearing covering over the dentine of varying thickness
Where is enamel thickness at its highest?
The incisor edge or cusp in a molar tooth
Where is the enamel thickness at its thinnest?
The cervical margin
What ar the hydroxyapatite crystals in enamel arranged in?
Prisms (sometimes called rods)
Where do enamel prisms run?
From the dentine to just below the tooth surface
What s he diameter of an enamel prism?
5 micro metres
What are enamel prisms perpendicular to in a longitudinal section of the tooth?
Th Almelo-Dentinal juniton (ADJ)
What is the rhythm of enamel production called?
circadian rhythm
How is enamel produced?
In a circadian rhythm which produces regular daily cross-striations with roughly a 5 micro metre periodicity
What are superimposed on theirs station in enamel?
other less frequent incremental lines called the (brown) striae of Retzius.
What aspens to the brown sttriae of Retzius as you get closer to the cusp?
They become more irregularly spaced
