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ORAL HISTO > DENTIN > Flashcards

DENTIN Flashcards

0
Q

Other names for tertiary dentin

A

Reactive
Reparative
Irreg secondary dentin

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1
Q

Other names of primary dentin

A

Regular

Ortho

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2
Q

Types of dentin

A

Primary
Secondary
Tertiary
Predentin/dentinoid

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3
Q

Primary dentin is divided into

A

Mantle

Circumpulpal dentin

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4
Q

Developed before eruption of tooth

A

Primary dentin

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5
Q

First layer of dentin DEPOSITED

A

Mantle dentin

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6
Q

Peripheral layer of dentin

Located adjacent to the enamel into the crowns of teeth

A

Mantle dentin

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7
Q

Mantle dentin consists of thick collagen

A

ALPHA fibrils

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8
Q

Dentin around the pulp

BULK OF THE DENTIN MASS

A

Circumpulpal dentin

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9
Q

Circumpulpal dentin consists of collagen _

A

BETA fibrils

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10
Q

Secondary dentin develops when..

A

AFTER root formation has been completed

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11
Q

_ in size and shape of the pulp chamber

A

Asymmetric reduction

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12
Q

Dentin is arranged in what configuration

A

Tubular configuration

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13
Q

Secondary dentin is found greater on

A

Roof and floor of the pulp chamber

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14
Q

It marks the change in orientation of tubules

A

Schregers line

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15
Q

Junction bet primary and secondary dentin

A

Schregers line

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16
Q

Tertiary dentin is only present on areas subjected to

A

Trauma or attrition

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17
Q

Dentin formed in response to NOXIOUS / IRRITATING STIMULI

A

Tertiary dentin

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18
Q

Ex of irritating stimuli that forms tertiary dentin

A

Toothbrush attrition
Caries
Abrasion

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19
Q

Type of dentin that is irregularly arranged and has few dentinal tubules

A

Tertiary dentin

20
Q

When can tertiary dentin can totally obliterate pulp

A

With aging or severe damage

21
Q

First dentin LAYDOWN ( completely organic)

A

Predentin or dentinoid

22
Q

Type: Uncalcified dentin

A

Predentin

23
Q

Thickness of predentin

A

10-47 mm

24
Q

Type: lines innermost portion of dentin

A

Predentin

25
Q

Predentin consists mainly of

A

Collagen
Glycoproteins
Proteoglycans

26
Q

Calcification in dentin

A

GLOBULAR

27
Q

Calcification of dentin occurs w in

A

24 hrs

28
Q

Characterized by a

Slower rate of deposition and an abrupt change in orientation

A

Secondary dentin

29
Q

Structural elements of dentin

A

Dentinal matrix

Dentinal tubules

30
Q

Dentinal matrix consists of

A

Peritubular or intratubular dentin

Intertubular dentin

31
Q

Dentinal tubules

A

Odontoblastic process or TOME’s FIBER
Periodontoblastic space
Intratubular nerve

32
Q

Covers the wall of the dentinal tubules

Formed in vital teeth throughout life

A

Intratubular dentin

33
Q

Intratubular dentin is _ than intertubular dentin

A

Is more calcified or dense

34
Q

Between the dentinal tubules

MAIN BULK OF DENTINAL MASS

A

Intertubular dentin

35
Q

Intertubular dentin consists of

A

Type 1 collagen fibers wc apatite crystals are separated

36
Q

Regularly arranged canals from the PULP to the DEJ/DCJ

A

Dentinal tubules

37
Q

Dentinal tubules are tapered structure
DEJ-
Pulp-

A

Dej- 0.9mm - 1.2mm

PULP- 2.5 mm

38
Q

Exhibits an S SHAPED curvature

A

Dentinal tubules

39
Q

Dentinal tubules are less pronounced in the

A

INCISAL

CUSPAL areas

40
Q

Tubules near the _ are smaller, more sparsely, less dense, distributed near the pulp

A

Tubules near the dej

41
Q

Tubules in _ are smaller and less numerous than the coronal dentin

A

Tubules in root dentin

42
Q

2 Terminal branching:

A

Dichotomous branches

43
Q

3 or more terminal branching

A

Greater branching of dentinal tubules

44
Q

Contents of dentinal tubules

A

Odontoblastic processes
Periodontiblastic space
Intratubular nerve

45
Q

Other name for odontoblastic process

A

Tomes fiber

Dentinal fiber

46
Q

Cytoplasmic extension of the odontoblast found inside the dentinal tubules

A

Odontoblastic process

47
Q

Bet odon process and the wall of the tubule

A

Periodontoblasmic space

48
Q

Periodontoblastic space contain what fluid

A

Dentinal fluid

ORAL HISTO (11 decks)

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