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Derived from ectomesenchyme -Mesoderm, and makes up the bulk of the tooth, and protects the pulp
Dentin
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Mature dentin is only_______________calcified with______________________-
- 70%
- calcium hydroxyapatite
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Feels rougher than enamel, but it is softer than enamel and can be removed with instrumentation
Dentin
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true or false. Dentin is avascular so it gets its nutrition from the pulp
true
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During what stage do the outer cells of the dental papilla form odontoblasts? The odontoblasts lay down predentin and leave one long cytoplasmic extension in the dentin?
Apposition of dentin
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During the apposition of dentin, the outer cells of the dental papilla form__________________
odontoblasts
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Odontoblasts lay down what?
predentin
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true or false. Apposition can keep going because you keep your odontoblasts
true
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What are the two steps in the maturation of dentin?
- primary mineralization
- secondary mineralization
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globules calcify and expand and fuse together to create globular dentin
primary mineralization phase during maturation of dentin
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as globules calcify, they expand, but do not fuse completely, which creates interglubular dentin that is less mineralized
secondary mineralization phase during maturation of dentin
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Name 4 components of mature dentin
- dentinal tubules
- odontoblastic process
- dentinal fluid
- afferent axon
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extend from the DEJ to the outer wall of the pulp (the cave)
dentinal tubules
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the tail end of our odontoblasts (the cell within the cave)
odontoblastic process
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the tissue fluid surrounding the cell membrane of the odontoblast (where heat and cold affect the tooth)
dentinal fluid
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the nerve that receives sensation for the tooth, the nerve cell body is located in the pulp of the tooth (axon runs in the tube, the cell body is in the pulp)
afferent axon
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true or false. The direction of the tubule reflects the pathway the odontoblast took
true
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overall tubule course which resembles a large S
primary curvature of dentinal tubule
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small delicate curvature in dentinal tubules showing the daily changes in odontoblasts during apposition
secondary curvature
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types of dentin are divided into what 2 categories?
- location
- time of formation
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name the 4 types of dentin by location.
- peritubular dentin
- intertubular dentin
- mantle dentin
- circumpulpal dentin
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dentin that creates the dentinal tubule (wall of cave)
peritubular dentin
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dentin found between between each of the tubules
intertubular dentin
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first dentin to form, closest to the DEJ (outside layer)
mantle dentin
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dentin that surrounds the pulp
circumpulpal dentin
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Name the 4 types of dentin by time of formation.
- primary dentin
- secondary dentin
- tertiary dentin
- sclerotic dentin
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dentin formed before the completion of the apical foramen, normal alignment of tubules and more calcified than secondary
primary dentin
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dentin formed after the completion of the apical foramen, less calcified than primary dentin, formed to protect the pulp
secondary dentin
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formed in response to trauma, irregular alignment of tubules because it is laid quickly, formed to protect the outer layer of dentin
tertiary dentin
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because of trauma or age, the odontoblastic process die and leave the tubule, the tubule is then filled with more dentin
sclerotic dentin
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name 2 microscopic features of mature dentin
- imbrication lines of von ebner
- contour lines of owen
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lines in mature dentin that are just like the lines of retzius
imbrication lines of von ebner
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darkened areas in dentin that show some sort of disturbance in the apposition
contour lines of owen
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what is the most pronounced contour line of owen?
neonatal line
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true or false. diameter or the tubules in dentin starts to narrow with age, and as more dentin is laid and seals off the communication between the dentin and the pulp.
true
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name 2 clinical considerations of dentin
- caries chute
- hypersensitivity
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dentin is__________________and more prone to caries
less calcified
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What do bacteria use dentinal tubules as to get to the pulp?
chutes to the pulp
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Why when a cavity reaches the dentin, must it be repaired as soon as possible?
because bacteria may use the dentinal tubules as a chute to get the pulp, and they spread fast once they reach the dentin
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Afferent axons are where in the tooth?
in the dentinal tubule
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Afferent axon nerves in the dentinal tubules translate all stimuli (hot, cold, pressure, dehydration) as_______________.
Pain
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true or false. The exact mechanism for this hypersensitivity in the dentin is unknown
true
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What are 3 ways to occlude the dentinal tubules that can help diminish hypersensitivity?
- fluoride
- laser treatment
- composite fillings
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formed from the central cells of the dental papilla, which came from the ectomesenchyme- mesoderm
pulp
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what part of the tooth is functional by association?
pulp (it makes everything else work)
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Why is the pulp involved with the formation of dentin?
because the odontoblasts live in the outer layer of the pulp
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Why does the pulp have a sensory function?
because the nerve cell bodies are located in the outer layer of the pulp
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Pulp has a nutritional function for the tooth through the__________________
tubules
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Why does pulp have a protective function?
because the secondary dentin is formed from the odontoblasts in the outer layer of the pulp
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Name 6 anatomical features of the pulp
- pulp chamber
- coronal pulp
- pulp horns
- radicular pulp
- apical foramen
- accessory canals
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the mass of pulp in the middle, follows the shape of the tooth
pulp chamber
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the pulp in the crown area
coronal pulp
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smaller extensions of pulp into the crown
pulp horns
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the pulp in the root areas, it has openings through the dentin and cementum, out to the surrounding periodontal ligament
radicular pulp
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the opening of the pulp into the periodontal ligament - usually at the very apex of the tooth
apical foramen
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What structure allows arteries, veins, lymphatics and nerves to enter the tooth
apical foramen
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extra opening from the pulp to the periodontal ligament that usually runs perpendicular to the root of the tooth
accessory canals
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Accessory canals form because__________________________________ran into a blood vessel while it was forming, so it just formed a little canal around the vessel
Hertwig's epithelial root sheath (HERS)
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Name 6 microscopic features of pulp
- fibroblasts
- odontoblasts
- white blood cells
- collagen fibers
- extensive vascular supply
- pulp stones
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true or false. pulp is a connective tissue, so it is mainly full of fibroblasts
true
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may be present in the pulp sometimes, they are calcified masses of dentin inside the pulp chambers, they only really cause problems when trying to do endodontic therapy
pulp stones
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inflammation of the pulp
pulpitis
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Name 3 things that might cause pulpitis
- extensive caries
- cavity preparation
- traumatic injury
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true or false. The pressure from the inflammation of pulpitis can cause severe pain
true
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name 2 ways the the pressure from pulpitis might be relieved?
- incision and drainage
- fistula
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a channel that forms in the bone or soft tissue to drain infection from pulpitis
fistula
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the inflammation from pulpitis can exit the pulp through the apical foramen and cause a/an____________________
abscess
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What must be done to save a tooth from pulpitis?
root canal therapy
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why is it important to crown a tooth once a root canal has been performed on it?
without the pulp, the tooth becomes brittle and more prone to breakage
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a material that comes from a tree that is used to fill the empty canal once the pulp has been removed from a root canal, the body does not react to it
gutta percha
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