(4) Dentino-pulpal Complex - Structural Lines Flashcards
(50 cards)
What are the lines associated with the primary curvature of dental tubules called?
Schreger lines
What are the lines associated with the secondary curvatures of dental uvulae’s called?
Contour lines of Owen
What are daily incremental lines called?
Von Ebner’s lines
What are the weekly incremental lines called?
Anderesen lines
Where is the most dramatic secondary curvature line?
Between the primary and secondary dentin
What contour line is pointed to?
Secondary curvature line
Contour lines of Owen
How do the Von Ebner’s lines show?
Short term striations
How do the Andresen lines appear?
Long term striations
What gives rise to the incremental lines?
Fluctuations in acid-base balance
Effect on mineral content and thus the refractive index
What incremental lines are shown?
Von Ebner’s lines
Where are the Von Ebner’s lines closest together and farthest apart?
Closest (2um between every 2 lines) at the root
Farther away (4um between every 2 lines) at the cusp
Why are the Von Ebner’s lines closer together in the root?
Not as much dentin is formed in the root each day
What is pointed to and what do they run over?
Von Ebner’s lines, run over dentinal tubules
What incremental lines are shown?
Andresen lines
How far apart are Andresen lines?
16-20um
Name structures and what type of section
A = enamel
B = circumpulpal dentine
C = mantle dentin
Black arrows = stria of Ritzius
White arrows = andresen lines
Ground section
What line is shown in this image?
Neonatal line
Shows what was formed before and after birth
What are physiological age related changes associated with dentin?
Secondary dentin
Translucent dentin
What are age related changes associated with dentin, associated with response to stimuli?
Tertiary dentin
Sclerotic dentin
Dead tracts f fish
When does secondary dentin form?
Starts to form once the root is completed and teh tooth come into occlusion
What happens to the direction of the dentinal tubules in secondary dentin?
Sudden change in direction
Do the secondary or primary dentin have closer incremental lines?
Secondary
What has slower deposition, primary or secondary dentin?
Secondary, thus less regular
Contour line of Owen
