Dentine and Pulp Flashcards
(60 cards)
What is dentine?
bone like material w/ protein matrix
what is amelo-dentinal junction?
where dentine and enamel of crown meet
what happens to pulp with age?
It shrinks
What are the properties of dentine?
- harder than bone
- elastic not brittle
- yellow
what are the chemical properties of dentine?
65% inorganic mineral
35% organic= collagen/ proteoglycans/ glycoproteins/h20
What is the structure of Dentine?
HAP crystal
how are HAP crystals arranged?
parallel to collagen fibrils
What are dentinal tubules?
channels via dentine from pulp to outer dentine
what do tubules contain?
fluid and odontoblast
what is odontoblast?
outer surface of dentine that FORM dentine
What is curvature of Tubules?
S shape w/ wave deviations
when are tubules branches increased?
ADJ
What happens at ADJ?
enamel more mineralised than dentine
Where are tubules wider?
at Pulp end than ADJ end
what are tubules adjacent to?
enamel in crown and cementum in root
What is peritubular dentine?
deposited by odontoblast process
- dentine hypermineralised
What does larger Dentine surface area mean?
tubules more packed at pulpal surface
what happens to curvature as down root?
less curved
What are daily incremental lines of Dentine?
Von Ebner lines
how much is dentine laid down a day?
4um
what is superimposed on Von Ebner lines?
Andresen lines
What other lines are on dentine?
Contour lines of owen
Schreger lines
What are 3 types of dentine based on region?
1) Mantle and circumpulpal
2) Primary and regular secondary
3) peritubular and intertubular
What are 3 specific types of dentine
1) Irregular secondary/ tertiary or reparative
2) Dead tract
3) Sclerotic
