Dentin

Questions	Answer
Peritubular in interglobular dentin is a	Absent as interglobular dentin is  uncalcified
The looping of dentinal tubules in radicular dentin causes	Airspaces formation in the loop in ground section, resulting in internal reflection of transmitted light causing Tomes granular layer
Reason for absence of Tomes granular layer in crown is	Differences in rate of formation of dentinal tubule
Lines associated with primary curvature of dentin is	Schreger line - differentiating primary and secondary dentin
Lines associated with secondary curvature of dentin is	Contour line of Owen; neonatal line
short period deposition of incremental lines in dentin are commonly called as	von Ebner's line
The coarser long period lines in dentin are called as	Andresen line
Between two Andresen lines in dentin, there are ___________ number of von Ebner lines	six to 10 pairs
Where is the primary enamel knot found?	It is a found in the tip of epithelial tooth bud and is a signalling center
Where is the secondary enamel knot found?	At the site of future cusp tips