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Dentin Flashcards

(59 cards)

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1
Q

Makes up the bulk of the tooth

A

Dentin

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2
Q

Dentin is covered coronally by (1) ____ and in the root region by (2) ____

A
  1. Enamel
  2. Cementum
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3
Q

What is the function of dentin?

A

Encloses and protects the pulp tissue

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4
Q

Physical properties of dentin (6)

A
  1. Hard calcified tissue
  2. Has yellow intrinsic color
  3. Firm, resilient or highly elastic and deformable
  4. Radiopaque (whiter)
  5. Positively birefringent
  6. Porous and permeable
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5
Q

Inorganic material of dentin (4)

A
  1. hydroxyapatite crystals
    –> calcium
    –> phosphates
  2. Carbonates
  3. Magnesium
  4. Florine
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6
Q

Organic material of dentin (2)

A
  1. Collagen
    –> Mucopolysaccharides
  2. Ground substance
    –> non-collagenous matrix
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7
Q

What is found within the dentinal tubules (theory of dentinal fluid)

A

Water

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8
Q

What are the four types of dentin

A
  1. Primary
  2. Secondary
  3. Tertiary
  4. Predentin or Dentinoid
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9
Q

2 types of primary dentin

A
  1. Mantle dentin
  2. Circumpulpal dentin
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10
Q

It is the outer layer of dentin and is composed of thick collagen alpha fibrils

A

Mantle dentin

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11
Q

It is the bulk of the dentin and consists of beta fibrils

A

Circumpulpal dentin

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12
Q

When does secondary dentin develop?

A

After root formation has been completed

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13
Q

What type of dentin is continuous throughout life?

A

Secondary dentin

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14
Q

What type of dentin is responsible for pulp recession?

A

Secondary dentin

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15
Q

What is pulp recession?

A

Less pronounced pulp horns

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16
Q

This type of dentin is formed in response to outside or noxious stimuli

A

Tertiary dentin

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17
Q

tertiary dentin is also known as

A

reactive, reparative, or irregular secondary dentin

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18
Q

Tertiary dentin may have a variable atypical structures. Enumerate 3:

A
  1. Reduced # of dentinal tubules
  2. irregularly arranged dentinal tubules
  3. Absence of dentinal tubules
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19
Q

It is the demarcation line that separates the primary dentin to secondary or tertiary dentin

A

Schreger’s line

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20
Q

What minimizes dentin permeability

A

Sudden decrease in number or total disappearance of dentinal tubules

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21
Q

Dentin with vascular inclusion; found in lower vertebrates

A

Vasodentin

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22
Q

Dentin similar to bone and formed after an injury

A

Osteodentin

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23
Q

Mantle dentin; reduced absence of tubules

A

Atubular fibrodentin

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24
Q

It is the unmineralized or uncalcified dentin matrix that line the innermost (plural) portion of the dentin

Study These Flashcards
A

Predentin / dentinoid

25
What is predentin composed of (3)?
1. Collagen 2. Glycoprotein 3. Proteoglycans
26
TRUE or FALSE: the presence of predentin / dentinoid is important in maintaining the integrity of dentin
TRUE
27
2 fundamental units of intercellular material of dentin
1. Formed elements 2. Unformed elements
28
Formed elements
Collagen - alpha or korff's fibers
29
Ground substance
mucopolysaccharides
30
It covers the walls of dentinal tubules
Peritubular dentin / intratubular dentin
31
Dentinal matrix located between the dentinal tubules
Intertubular dentin
32
Which is more mineralized: peritubular dentin or intertubular dentin
Peritubular dentin
33
It is the main bulk of dentinal material
Intertubular dentin
34
What structure establishes communication with odontoblasts
Canaliculus
35
Are regularly arranged canals or spaces
Dentinal tubules
36
Terminal parts of tubules at the DEJ; divides into 2 equal branches
Dichotomous branching
37
Terminal parts of tubules at the DEJ; divides into 3 or more smaller branches
Greater branching of dentinal tubules
38
What is the direction of tubules in incisal and cusp areas
Straight course
39
What is the direction of tubules at the proximal areas of the crown
S-shaped curvature
40
Difference between primary and secondary curve
Primary = crowding of odontoblasts; causes S-shaped course Secondary = odontoblasts undulations creating wavy curves; within primary curve
41
What is the cytoplasmic extension of odontoblasts
Odontoblastic process
42
The periodontoblastic space is found between what structures?
1. cytoplasmic membrane of the odontoblastic process 2. wall of the dentinal tubule
43
Periodontoblastic space contains what (3)?
1. Dentinal fluid 2. collagen fibrin 3. peritubular dentin
44
Non-myelinated fibers that originate from the trigeminal verve
Intratubular nerve
45
Intratubular nerve arises from which structure?
plexus of raschkow
46
Theory of dentin sensitivity: odontoblasts is the primary sensory cells
Transduction theory
47
Theory of dentin sensitivity: dentinal fluid motion on thermal stimulation
Hydrodynamic theory
48
Theory of dentin sensitivity: nerve endings in dentin
Direct conduction theory
49
It is an area of structural defect which result from the failure of globules of calcospherites to fuse
Interglobular dentin / interglobular areas
50
Where is intergloular dentin / interglobular ares frequenty seen?
Circumpulpal dentin
51
It is the coalescing and looping of the terminal portions of the tubules
Granular layer of tomes
52
It is the equivalent of transverse striations in the enamel
Incremental lines of Von Ebner
53
What is transverse striations in enamel and Incremental lines of Von Ebner in dentin?
Daily apposition growth
54
This corresponds to the incremental lines of retzius in the enamel
Contour lines of Owen
55
What does the incremental Iines of retzius in enamel and contour lines of Owen in dentin represent?
Growth lines / calcification growth lines
56
It is the thickening of the peritubular dentin
Sclerotic dentin / transparent dentin
57
How does sclerotic dentin form?
Complete obliteration of the dentinal tubules
58
What results to the death of odontoblasts?
Dead tracts
59
Dentinal tubules are emptied by ____ and ____
Complete retraction of the odontoblastic process and death of odontobalsts

OHE (5 decks)

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