dentin essentials Flashcards

1
Q

dentin location

A

in crown and root

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2
Q

dentin structure

A

tubular - microcanals radiate from dental pulp to enamel

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3
Q

dentin color

A

yellow

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4
Q

percentage mineralized inorganic substrates - calcium hydroxyapatite

A

65-70%

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5
Q

percentage organic substrates - collagenous protein

A

20-25%

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6
Q

percentage bound water

A

10%

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7
Q

Tomes fiber

A

vital tissue; cytoplasmic cell process

odontoblast process (an extension of an odontoblast- located in the dentinal tubules)

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8
Q

odontoblast

A

vital tissue; innervation to pulp

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9
Q

types of nerve fibers

A

myelinated A-fibers

unmyelinated C-fibers

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10
Q

Tomes layer

A

peripheral layer

cytoplastic process

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11
Q

Hyaline of Hopewell-Smith

A

clear layer between Tomes layer and cementum

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12
Q

cementum composition

A

45-50% inorganic (hydroxyapatite)

5-55% organic and water (collagen and proteoglycans)

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13
Q

cementum

A

thin layer (30-200 micrometers) of bonelike

material covering root surfaces
softer than enamel and dentin

fibers of periodontal membrane-ligament are connected to cementum

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14
Q

Lines of Owen

A

disturbance during mineralization

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15
Q

loss of cementum

A

exposed dentin

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16
Q

dentin tubules

A

primary curvature & secondary curvature

result from movement of odontoblasts during development

17
Q

primary curvature

18
Q

secondary cuvature

A

jagged or wrinkled texture

19
Q

s-shaped

A

tooth crown

20
Q

straighter path of tubules

A

root of tooth

21
Q

primary dentin

A

most prominent dentin

lies between the enamel and pulp chamber starting at the dentinoenamel junction

22
Q

mantle-dentin

A

the first formed dentin by odontoblast differentiation; it is located in both the crown underlying the DEJ and the root of the tooth

23
Q

circumpulpal dentin

A

remaining bulk of primary dentin; collagen fibers narrower and thicker than M-D; greater mineralization than M-D; compact arrangement of fibers

24
Q

secondary dentin

A

all dentin formed after root formation is completed (not due to trauma or dental pathology) - closest to pulp (visible on dental radiographs)

forms at slower rate than primary dentin but grows incrementally but unequally

25
what happens when tooth ages
secondary dentin grows, narrowing pulp chamber
26
tertiary dentin
dentin formed as reaction to external stimulation (pathologic) response to trauma can cause narrowing of pulp chambers and root canals
27
reactionary tertiary dentin
formed from preexisting odontoblast
28
reparative tertiary dentin
formed from newly differentiated odontoblasts
29
sclerotic dentin
tertiary dentin - depositied in response to trauma - more mineralized - tubules diameter narrows - less permeable - difficult to bond