Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Histology > Unit 11 - Dentin and Pulp > Flashcards

Unit 11 - Dentin and Pulp Flashcards

1
Q

Resistance of a material to breaking under pressure

A

Tensile strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Chemical characteristics of dentin

A

70% inorganic
20% organic
10% water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Is dentin harder than bone?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Is dentin vascular?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Three types of dentin

A

Primary
Secondary
Tertiary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When does dentinogenesis begin?

A

In the late bell stage of tooth development

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe dentinogenesis

A

Odontoblasts orginate from neural crest cells of the papilla. Odontoblasts are introduced by the inner enamel epithelial cells in the crown and hertwig’s epithelial cells on the root.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Collagen fibrils in the first layer of the dentin matrix are course in texture and are laid

A

Perpendicular to the DEJ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the collagen fibrils in the first layer that are laid perpendicular to the DEJ called?

A

Von Kroff’s fibers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Collagen fibers in the remaining layers are

A

Finer and run paralell to the DEJ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Uncalcified matrix is referred to as

A

Predentin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

During matrix production phase, unmineralized dentin remains present adjacent to the

A

Odontoblasts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

During dentin’s first phase of maturation, a membrane bound vesicle is deposited in the matrix. This vesicle contains

A

Several hydroxyappetite crystals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Describe the first phase of maturation for dentin development

A

A membrane bound vesicle is deposited in the maxtrix. This vesicle contains several hydroxyappetite crystals.

The crystals is the vesicle will grow until large enough to rupture the membrane

Many growing crystals will coalesce with one another obsurcing the matrix

Gradually the crystals fuse to each other until the dentin is fully mineralized

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Describe the second phase of maturation during dentin development

A

New areas of crystal formation appear and expand but do not fuse completely to each other

The globules of mineralizing dentin remain visible in the predentin/dentin border

Mineralization process is now complete. Fusion during the secondary mineralization phase results in microscopic differences

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Areas of complete crystaline fusion of dentin are refered to as

A

Globular dentin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Areas of incomplete fusion of globules of dentin are referred to as

A

Interglobular dentin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Dentinal tubules extend through the dentin from DEJ to pulp in an _______ shape

A

S

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The tubules provide the space in which the _______________ is housed

A

Odontoblast process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Odontoblastic processes are responsible for

A

Maintaining and repairing dentin after the caries process and dental restorative procedures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

The tubules are crowded at the ______ surfaces

A

Occulsal or incisal

22
Q

What runs off from the tubles to inter-connect tubles?

A

Lateral extensions

23
Q

What results in the permeability quality of dentin?

A

Dentinal tubules

24
Q

Type of dentin that appears as a bright halo, hypermineralized, region between the tubules is a less mineralized region.

A

Peritubular

25
Q

Type of dentin that appears between the tubules and is the majority of dentin. It is less calcified than peritubular.

A

Intertubular

26
Q

The outermost layer of dentin and the root is mostly made up of this type of dentin

A

Mantle

27
Q

The term used to describe an area of dentin

A

Circumpulpal

28
Q

Dentin formed before the apical foramen was complete

A

Primary

29
Q

Dentin formed after the apical formaen due to everyday stimuli

A

Secondary

30
Q

Dentin formed in response to trauma

A

Tertiary

31
Q

Formed during rythmic active and quiet phases which makes a difference appearance of layers. The lines run at right angles to the tubules

A

Incrimental Lines of Von Ebner

32
Q

This results from an illness or metabolic disturbance and is a band of dentin that is slightly different in composition from the rest of dentin layers.

A

Contour Lines of Owen

33
Q

These are islands of non-calcified dentin. Located in the surface layer of cementum in root dentin.

A

Tomes granular layer

34
Q

In aging dentin, the diameter narrows tubule narrows because of

A

Deposition of peritubular dentin

35
Q

When the tubules are completely calcified it is referred to as

A

Sclerotic dentin

36
Q

Functions of pulp

A

Support
Sensory
Nutritive
Protective

37
Q

Pulp anatomy: apical foramen size

A

0.3 - 0.6 mm diameter

38
Q

What happens to the apical foramen with age?

A

Reduces in size due to cementum and dentin gradually depositing

39
Q

Extra canals which develop where the Hertwig’s Epithelial Root Sheath was interrupted by blood vessels passing through it.

A

Accessory canals

40
Q

Removal of pulp chamber and pulp horns

A

Pulpectomy

41
Q

Removal of the pulp horns only

A

Pulpotomy

42
Q

Removal of the coronal and radicular pulp

A

Endodontic therapy (RCT)

43
Q

Calcified bodies in pulp that can form with the pulp or with age or if the pulp becomes ill

A

Pulp stones or denticles

44
Q

What is microscopically seen that the deposits resemble dentin by exhibiting tubules and a process? They are formed with the tooth often in the root canals but can also be in the center of the pulp

A

True denticles

45
Q

What are the three types of denticles?

A

True Denticles
False Denticles
Diffuse/embedded Calcifications

46
Q

What type of denticle is formed with age, usually in the coronal pulp and formed with minerals around debris in the pulpal tissue?

A

False denticles

47
Q

How are false denticles viewed under microscope?

A

Irregular concentric layers of a calcified matrix

48
Q

What type of denticle forms due to an ill pulp inducing spontaneous calcifications in a number of locations?

A

Diffuse/embedded denticles

49
Q

How are diffuse/embedded denticles viewed under a microscope?

A

Same as false denticles in structure and usually seen in the root

50
Q
A

Histology (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions