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ABO Written Exam > 2015 pt. 1 > Flashcards

2015 pt. 1 Flashcards

1
Q

Difference between ameloblast and odontoblast

A

Ameloblast: Lays down enamel
Odontoblast: Lays down dentin

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2
Q

What makes a stem cell a stem cell?

A

Pleuripotent and ability to self-replicate

In other words, be able to self-renew and differntiate into at least 3 different cell types

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3
Q

T/F
Prostaglandins inhibit tooth movement.
They make pain fibers less likely to fire

A

False (Promote tooth movement)

False (More likely to fire)

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4
Q

T/F

Thyroxine and parathyroid hormone decrease/have inhibitory effect on rate of tooth movement

A

False. Promote tooth movement

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5
Q

Decreased bone loss in presence of active perio disease is due to what?

A

The inflammatory response prevents osteoblast activity and only osteoclasts are active

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6
Q

Why is there a greater break down of bone in patients with gingival inflammation?

a. Osteoporosis
b. Higher prostaglandin levels
c. Higher phosphatase levels

A

b. Higher prostaglandin levels

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7
Q

During orthodontic tooth movement, which of the following cells are not present in the hyalinized zone?

a. Cementoblasts
b. PMN’s
c. Macrophages
d. Fibroblasts
e. Osteoclasts

A

Osteoclasts

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8
Q

T/F
Osteoclasts are from hematogenous origin
Osteoblasts from mesenchyme

A

True

True

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9
Q

Which of the following doesn’t affect gingival response and fibroblasts?

A

Neocytokine

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10
Q

T/F

PDL regenerates twice as much as gingiva

A

False, same turnover

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11
Q

Which of the following does not increase during tooth movement

a. IL-1
b. Interferon gamma
c. TNF-beta
d. Neocytokine

A

Neocytokine

Does not increase and therefore not involved in gingival response or found in gingival turnover

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12
Q

Which gingival fibers are responsible for orthodontic relapse

A

Supracrestal

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13
Q

T/F

Collagen fibers in the PDL are inelastic

A

True

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14
Q

Tongue comes from which branchial arch?

A

1st and 3rd

2nd arch atrophies

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15
Q

At what week in embryo does the tongue form?

A

4 weeks

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16
Q

What does the lateral nasal process form?

A

The alae of the nose

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17
Q

What processes make up the primary palate

A

Maxillary and Medial nasal processes

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18
Q

What processes make up the secondary palate?

A

Outgrowth of maxillary process –> palatal process

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19
Q

The median nasal process forms what structures?

A 
Intermaxillary segment -->philtrum of upper lip
Primary palate (with maxillary process)
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20
Q

The maxillary process forms what structures?

A

Cheeks, Lateral aspects of upper lip

Primary palate & Secondary palate

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21
Q

Failure of closure of what processes causes cleft palate?

A

Maxillary and medial nasal processes

22
Q

A study found that pregnant women supplemented with 0.4 mg of folic acid displayed what percentage decrease in occurrence of cleft lip/palate?

A

20-35% (20-50% or 33%)

23
Q

Primary palate forms at what week in embryo

A

6-9 weeks

24
Q

Frontonasal process gives rise to what structures?

A 
Forehead
Bridge of nose
Columella of nose
ALa of nose
Philtrum
Primary palate
25
Q

Frontonasal process does NOT give rise to?

A

Maxillary process
Vermillion border
Lateral Lip
Secondary Palate

26
Q

What structure does the lateral nasal process and maxillary process form?

A

Nasolacrimal duct

27
Q

Meckel’s carilage gives rise to?

A

Incus and Malleus of inner ear

Sphenomandibular ligament

28
Q

The first branchial arch forms what structures?

a. Maxilla and Mandible
b. Maxilla
c. Ear and eye
d. Hyoid bone (2nd and 3rd)

A

Maxilla and Mandible

29
Q

What structures arise from the secondary cartilage in the mandible

A

Head of the Condyle
Coronoid process
Symphyseal or mental protuberances

30
Q

At what age does the mandible of mandibular symphysis fuse?

A

1 year

31
Q

Describe bony chin remodeling

A

Lingual symphyseal deposition

Deposition on internal symphysis on the lingual another way of saying it

32
Q

Resorption pattern of the maxilla?

As maxilla grows down and forward, where does it resorb?

A

Superior and anterior

33
Q

Where is there bone deposition on the maxilla?

A

Posterior and inferior

34
Q

The key ridge models in what direction?

A

Downwards and backwards

35
Q

What happens on the orbital floor and nasal floor during growth?

A

Bone apposition: Orbital floor (it models upward during growth)
Bone resorption: Nasal floor (models downward)

36
Q

Which of the following does not provide growth of the head
a. Synostosis
b. Cranial valut
C. Cranial base

A

Synostosis

37
Q

Tranlsational growth is due to what?

A

Capsular matrix

38
Q

How do sutures grow?

A

Periosteal

39
Q

Is suture growth unidirectional?

A

NO

40
Q

What determines the main growth of the cranium?

A

Soft tissue determines

41
Q

What is true for sutural growth?

A

Apposition of bone

42
Q

When does the Spheno-ethmoidal synostoses close?

A

7-8 years

43
Q

What is not correct?

a. Intersphenoid closes at birth
b. Sphenoethmoidal closes at 7-8 years
c. Sphenoccipital closes at 12-14 years

A

a. Intersphenoid closes at birth

44
Q

Closure of what synchondrosis/suture indicates completion of the cranial base?

A

Spheno-occipital

45
Q

What marks the start of adolescence?

A

Hypothalamus

46
Q

Which bone allows other to slide past each other during growth?

A

Lacrimal bone

47
Q

When does the permanent first molar calcify/mineralize?

A

At birth

48
Q

The primary second molar is most commonly found in what position/occlusal relationship?

A

Flush Terminal plane

49
Q 
T/F
Distal step turns into class 2
Flush terminal plane turns into class 2 or 1
A

True

True

50
Q

Agenesis of the third molars occurs how often?

A

20%

51
Q

All of the following are true regarding transposition except?

a. maxillary predisposition
b. is associated with crowding
c. most common in maxillary arch is 3-4
d. most common in mandibular arch is 3-2

A

b. is associated with crowding

Not accurate

ABO Written Exam (24 decks)

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