% of mineralization of enamel?
Color of enamel?
White to grayish white
True or false. After eruption, enamel increases density?
True or false. After eruption, enamel becomes less permeable?
Substances that enamel allow to flow through? (2)
Texture of enamel?
Smooth and glossy
Specific gravity of enamel?
Chemical formula of hydroxyapatite?
Fluorine and chlorine can be substituted for OH groups
Organic content of enamel?
Enamel proteins (2-4%)
Enamel proteins are collagenous or non-collagenous?
Loss of function of amelogenin would cause?
Thin enamel without enamel rods
It inhibits lateral growth of hydroxyapatite?
Hydrophobic proteins rich in proline, histidine and glutamine?
Enamel protein found mostly in newly formed enamel?
Loss of ameloblastin would cause?
- Terminal branching
- Detachment of ameloblast from dentin
- Amelogenesis aborts
Largest but least abundant enamel protein?
Fundamental organizational unit of enamel?
Shape of immature enamel rods?
General direction of enamel rods?
Perpendicular to DEJ
Direction of enamel rods under pits and fissure?
Direction of enamel rods in proximal?
Direction of enamel rods in cervical of deciduous teeth?
Direction of enamel rods cervical of permanent teeth?
Its crystals are oriented in a different direction from enamel rod?
Accounts for the fish scale appearance?
Enamel rod sheath
True or false. Enamel rod sheath contains more inorganic material than enamel rod and interrod enamel?
Enamel rod sheath is more organic
True or false. Enamel rod sheath are more acid resistant.
True or false. Enamel rod sheath covers the entire rod.
Incremental lines of enamel?
Striae of Retzius
Striae of Retzius run from the DEJ in an ________ direction to the occlusal surface.