Enamel Tufts

Question 1. Enamel lamellae and enamel tufts.
Answer:

Enamel tufts:

They are called enamel tufts as they appear as tufts of grass in cross-section.
They consist of hypocalcified enamel rods and interprismatic substances.
They even contain a great concentration of enamel proteins – the major is 13.17 kd protein.
They are ribbon-like structures with their inner end arising in dentin.
They are abundantly seen in horizontal and longitudinal sections.

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Extend:

Significance:

Question 2. Incremental lines in enamel.
Answer:

They are seen as a series of dark lines extending from DEJ toward the tooth surface.
While in cross-section they appear as concentric rings.
They reflect oppositional or incremental growth of the enamel layer.
As the crown becomes bigger, new cohorts of cells are added cervically to compensate for the increase in size.
The demarcation between the enamel produced by these cohorts appear as a line of Retzius.

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In longitudinal sections, they surround the tips of dentin and in the cervical parts they run an oblique course.
From the DEJ to the enamel surfaces, they deviate occlusal.
They are hypo-mineralized structures
They reflect variations in structure and mineralization that occur during the growth of the enamel.
The evenly spaced lines represent 6-11 days of rhythm in enamel formation while other lines are due to stress.
Broadening of the incremental lines occurs in abnormal conditions arising due to metabolic disturbances.
Incremental lines of Retzius Dentinoenam junction

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