roger shore teeth.pdf · of raschkow cell-rich zone cell-free zone odontoblasts predentine ....
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Teeth Roger Shore
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Permanent human dentition – 32 teeth
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CROWN
ROOT
CUSP
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Periodontium
4 Connective
tissues:
2 calcified
2 non-calcified
Calcified
1. cementum
2. alveolar bone
(lamina dura)
Non calcified
1. lamina propria
2. periodontal
ligament
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A
B
C
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Periodontium
4 Connective
tissues:
2 calcified
2 non-calcified
Calcified
1. cementum
2. alveolar bone
(lamina dura)
Non calcified
1. lamina propria
2. periodontal
ligament
Common element
fibrous collagen
is the bulk protein
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CROWN
ROOT
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ENAMEL 1
PHYSICAL PROPERTIES:
Very hard and brittle – relies on DENTINE for resilience
Colour dictated by its translucency and colour of underlying dentine
CHEMICAL COMPOSITION:
96-99% mineral by weight (hydroxyapatite) (c.f. 60% for bone)
3% water
1% organic (mainly protein but not collagen)
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a. Local hypoplastic b. Pitted hypoplastic c. Rough hypoplastic d. Hypomature e. Hypocalcified
A
B C
D E
Amelogenesis imperfecta
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ENAMEL 2
BASIC STRUCTURE:
Hydroxyapatite crystal 60-90nm x 25-30nm x ?
(c.f. bone crystals 40nm x 5-10nm x 50nm)
Ca10(PO4)6OH2
Crystals arranged into PRISMS (RODS) (approx 5µm diameter)
Prisms perpendicular to ADJ
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Amelo-dentinal
junction Tooth surface
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CROWN
ROOT
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DENTINE
PHYSICAL PROPERTIES:
Slightly harder than bone
Elastic, not brittle
Yellow in colour
CHEMICAL COMPOSITION:
65% mineral (by wt), 35% organic and water
Organic mainly COLLAGEN but also
proteoglycans and glycoproteins
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DENTINE 2
BASIC STRUCTURE:
Hydroxyapatite crystal
Crystals arranged mainly parallel to collagen (meshwork)
Dentinal tubules containing ODONTOBLAST process
Tubule extends from pulp to ADJ (odont. process also?)
Tubules not straight, they have –
primary curvature (resembles ‘S’ shape)
secondary curvatures (small, relatively regular
wave-like deviations superimposed on primary c.)
Tubules branched (mainly at ADJ)
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Enamel Dentine
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Peritubular
dentine
Intertubular
dentine
3. PERITUBULAR (hypermineralised) and INTERTUBULAR
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4. IRREGULAR SECONDARY (TERTIARY or REPARATIVE)
(REACTIONARY or REPARATIVE)
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Pulp
Mineralised
dentine Predentine
Odontoblasts
Cell-free zone
(of Weil)
Cell-rich zone
Calcospherites
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Odontoblasts
Dentine
Pulp
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Nerve plexus
of Raschkow
Cell-rich
zone
Cell-free
zone
Odontoblasts
Predentine
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PROPOSED MECHANISMS OF DENTINE SENSITIVITY
1. Direct innervation
2. Odontoblasts act as sensory endings
3. Hydrodynamics (fluid flow)
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Den
tine
P
re-d
en
tine
O
do
nto
bla
sts
N
erv
e p
lex
us
Direct innervation Odontoblast as ending Hydrodynamic
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The End