10. Incremental lines in dentine
Imbrication or von Ebner lines: line's
in the dentin of the tooth that reflect
variations in mineralization during
dentin formation; the distance between
the line's corresponds to the daily rate of
dentin formation. It appear as fine lines,
which in longitudinal section run at right
angles to the D.T.
Counter lines of Owens:
Its hypocalcified line, it distinguish
in cross ground section as
accentuated few lines. These lines
arises due to disturbances in D.
matrix and mineralizing process.
11. Neonatal lines:
This line separating between prenatal and postnatal D. and mostly found
in deciduous and first permanent molar. This line is the result of
incomplete calcification, due to metabolic disturbances at the time of
birth to the abrupt changes in environment and nutrition.
In forensic dentistry, the neonatal line can be used to distinguish matters
such as if a child died before or after birth and approximately how long a
child lived after birth.
