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AU14 Orthodontics > Quiz Questions > Flashcards

Quiz Questions Flashcards

1
Q

If maxillary 2nd premolars erupt at age 12, what other maxillary teeth would you expect to see erupting at that time

A. 1st premolars

B. lateral incisors

C. 1st molars

D. canines

A

D. canines

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2
Q

True or False

Both of the following two processes are necessary for pre-emergent eruption 1. respiration of bone and primary tooth roots overlying the crown of the eruption tooth 2. the eruption mechanism must then move in direction where the path has been cleared

A

True

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3
Q

In a normal child, what is important to ensure there is normal space for permanent incisors when they erupt

A. symmetric jaws

B. small primary incisors

C. early eruption of permanent canines

D. spaces between primary incisors

A

D. spaces between primary incisors

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4
Q

The transition from the mixed to the permanent dentition, and in the presence of normal growth pattern, which of the following is most likely to occur

A. flush terminal place relationship become class II relationship

B. mesial step becomes end-to-end molar relationship

C. flush terminal plane becomes a class I relationship

D. distal step becomes a class III relationship

E. mesial step becomes a class III relationship

A

C. flush terminal plane becomes a class I relationship

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5
Q

The cephalocaudal gradient of growth is evident within the head, examples are 1. the greater postnatal growth of the face compared with the cranium 2. the greater postnatal growth of the maxilla compared with the mandible

A. 1 and 2 are both TRUE

B. 1 and 2 are both FALSE

C. 1 is TRUE and 2 is FALSE

D. 1 is FALSE and 2 is TRUE

A

C. 1 is TRUE and 2 is FALSE

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6
Q
  1. A child is considered within the normal range if their height and weight are above the 97th percentile 2. A child whose weight goes from the 70th to the 5th percentile is considered to be exhibiting normal adolescent growth

A. 1 and 2 are both TRUE

B. 1 and 2 are both FALSE

C. 1 is TRUE and 2 is FALSE

D. 1 is FALSE and 2 is TRUE

A

B. 1 and 2 are both FALSE

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7
Q

In normal youths approaching puberty, which of the following provides information on the child’s position on the growth curve relative to the adolescent growth spurt?

A. Rapidity of recent growth

B. Change in clothes sizes (pants length)

C. Signs of sexual maturation

D. Age sexual maturation occurred in older siblings

E. All of the Above

A

E. All of the Above

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8
Q

In the absences of history of trauma, the failure of a maxillary central incisor to erupt, even after the eruption of the contra-lateral central and both lateral incisors, would lead you to most strongly suspect:

A, Normal variation in eruption

B. Agenesis of the central incisor

C. Mesiodens

D. Submucosal cleft

A

C. Mesiodens

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9
Q

The Leeway-Space is:

A. The difference in size between the primary and second molar and permanent and second premolar

B. The difference in size between the primary canine/molars and permanent canine/premolars

C. Greater in the maxillary arch

D. A and C

E. B and C

A

B. The difference in size between the primary canine/molars and permanent canine/premolars

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10
Q

There are several ways to assess whether a child is past their peak growth spurt. These include all of the following except:

A. Analysis of the cervical vertebral maturation stage (CVMS)

B. Hand-wrist radiographs

C. Complete eruption of the permanent dentition

D. Plotting a child’s height and weight over years on growth charts

E. Serial cephalometric films

A

C. Complete eruption of the permanent dentition

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11
Q

Translation of the maxilla and mandible during growth and development most commonly:

A. Occurs in a upward and backward direction

B. Occurs in a downward and forward direction

C. Is the only way that the maxilla and mandible grow

D. It results in smaller spaces for functions such as breathing and mastication

A

B. Occurs in a downward and forward direction

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12
Q

The term Endochondral growth refers to the formation of bone within a cartilage precursor. The following cranial structures are formed by endochondral growth:

A. Cranial base

B. Head of mandibular condyle

C. Bones of the cranial vault

D. Maxilla

E. Only A and B

A

E. Only A and B

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13
Q

Meckel’s cartilage:

A. Is the cartilage of the first pharyngeal arch

B. It is ossified to form the mandible

C. Its remanats form the condylar cartilage

D. Is a growth center which continues post-natally

A

A. Is the cartilage of the first pharyngeal arch

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14
Q

The synchondroses of the cranial base:

A. Cartilaginous joints between bones

B. Immoveable joints

C. Areas of endochondral bone growth

D. Growth centers

E. All of the Above

A

E. All of the Above

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15
Q

The functional matrix theory of jaw growth proposes that:

A. Nasal septum is the primary determinant of growth

B. Sutures are the primary determinants of growth

C. Bone is the primary determinant of growth

D. Growth is mediated by the overlying soft tissue

A

D. Growth is mediated by the overlying soft tissue

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16
Q

True or False

The first steps in orthodontic diagnosis are to establish a chief complaint and review the the medical and dental history

A

True

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17
Q
  1. Normal facial symmetry includes some minor differences between the two sides of the face 2. Beauty is generally not associated with markedly asymmetric facial features
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

a. 1 is true 2 is true

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18
Q
  1. Incisor protrusion can produce well aligned teeth instead of crowded incisors 2. Incisor protrusion can lead to lip incompetence
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

a. 1 is true 2 is true

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19
Q
  1. Even in young children normal range of opening is an important indicator of normal TMJ function 2. Lateral, or anterior shifts of the mandible on closing can indicated an underlying occlusial problem
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

a. 1 is true 2 is true

20
Q
  1. Nose size and chin prominence influence the amount of lip prominence that is acceptable 2. The mandibular plane angle is best viewed from the profile view
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

a. 1 is true 2 is true

21
Q
  1. Treatment planning includes bring dental disease under control before begingin orthodontic treatment 2. Psychological problems may indicate a need for orthodontic treatment
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

a. 1 is true 2 is true

22
Q
  1. Malocclusion can have dental skeletal and soft tissue components 2. Only dental component of malocclusion are expressed in the A-P, transverse and vertical plantes
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

b. 1 is true 2 is false

23
Q
  1. Excess anterior space does not decrease from the early mixed dentition to the permanent dentition 2. Ethnic differences in occlusions only reflect environmental differences
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

d. 1 is false 2 is false

24
Q
  1. The # of people with well-aligned (no crowding) max incisors decreases as they get older (mixed to permanent dentition) 2. The # of people with a normal overbite increases as they get older
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

a. 1 is true 2 is true → alignment decreases (permanent to adulthood, alignment stays about the same)

25
Q

Over time there have been canges in the mammalian and human lines that affect the proablility of crowding and malalignment. All of the following have take place except:

a. decrease in size of jaw
b. decrease in # of molars
c. decrease in # of premolars
d. decrease in size of teeth
e. decrease in # of muslces of mastication

A

e. decrease in # of muslces of mastication

26
Q

The best supported reason(s) for ortho treatment for malocclusion include following: 1. Psychological considerations 2. Functional considerations 3. Prevent general periodontal problems 4. Prevent tooth decay problems

a. 1 only
b. 2 only
c. 3 only
d. 4 only
e. 1 and 2

A

e. 1 and 2

27
Q
  1. In general, the genetic heritable influence on the malocclusion is stronger for skeletal relationships (e.g. length of mandible) and weaker for dental relationships (e.g. crowding) 2. Heritable influence on occlusion is probably not more than 50%
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

a. 1 is true 2 is true

28
Q
  1. You see a child with mixed dentition who presents with : 1. Protruding upper incisors 2. Anterior open bite 3. Maxillary constriction 4. Crossbite in center occlusion, you would strongly expect:
    a. Submucosal cleft
    b. Undiagnosed bilateral condylar fracture
    c. Maxillary hyopolasia – undeveloped maxillary
    d. Fetal molding – restricted mandible
    e. Thumb sucking habit
A

e. Thumb sucking habit

29
Q
  1. Measurable forces from the tongue and soft tissues on the teeth at rest are in general equilibrium 2. Normal forces of function: speaking, chewing and swallowing, maintain that equilibrium of force of the TEETH – don’t add up to 6 hours
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

c. 1 is false 2 is true

30
Q
  1. In majority of cases, cause of malocclusion is unknown 2. Only 1/3 of population has a malocclusion
    a. 1 is true 2 is true
    b. 1 is true 2 is false
    c. 1 is false 2 is true
    d. 1 is false 2 is false
A

b. 1 is true 2 is false

31
Q

Extrinsic stiffness is used to describe an archwire’s capacity to be deformed elastically when a force is applied to it. Which one(s) of the following attributes of an archwire can be changed by an orthodontist to obtain desired stiffness of the archwire for orthodontic treatment?

A. Size

B. Shape

C. Composition

D. Size and composition

E. Size, shape and composition

A

E. Size, shape and composition

32
Q

All of the following are materials used for orthodontic archwires EXCEPT one. Which one is the EXCEPTION?

A. Stainless steel

B. Beta Titanium

C. Nickel Titanium

D. Vitallium

A

D. Vitallium

33
Q

When increasing the length of an archwire by forming a loop, what properties of the archwire will be enhanced?

A. Stiffness and range

B. Springiness and range

C. Stiffness and strength

D. Strength only

E. Springiness only

A

B. Springiness and range

34
Q

In order to align severely crooked teeth, which one of the wires may work most efficiently for the initial phase of treatment?

A. 0.018X0.025 rectangular Ni-Ti

B. 0.014 round Ni-Ti C. 0.020 round stainless

D. 0.016X0.016 β-Titanium

E. Any small size archwire should be equally efficient

A

B. 0.014 round Ni-Ti

35
Q

In a patient receiving active orthodontic treatment, the location of center of resistance (Cres) of his (her) maxillary canine varies with _____?

A. Its center of gravity

B. Its center of rotation

C. The height of alveolar bone that supports this tooth

D. The point of application of orthodontic force

E. The magnitude of orthodontic force

A

C. The height of alveolar bone that supports this tooth

36
Q

A moment is defined as:

A. A measure of the tendency of an object to rotate around some point

B. Generated by a force not passing through the center of resistance

C. Measured in such units as gram-millimeters

D. All of the above

A

D. All of the above

37
Q

In the diagram below, a 100g force is applied to a tooth and it will produce _____?

A. a 900 g.mm moment of clockwise rotation

B. a 900 g.mm moment of counter clockwise rotation

C. a 1500 g.mm moment of clockwise rotation

D. a 1200 g.mm moment of clockwise rotation

E. a 1200 g.mm moment of counter clockwise rotation

A

A. a 900 g.mm moment of clockwise rotation

38
Q

When the movement of an incisor is translation, its

center of rotation is located at _____?

A. Its root apex

B. Its incisal edge

C. Slightly apical to its center of resistance

D. Infinity

E. About 40% of the root apical to the alveolar crest

A

D. Infinity

39
Q

Where is the center of rotation located for a

controlled tipping movement?

A, infinity

B, center of resistance

C, apex

D, incisal edge

E, slightly apical to the center or resistance

A

C. apex

40
Q

In orthodontics, when a force (F) applied to the crown does not

pass through the center of resistance, translation of the tooth is

possible by _______?

A, Adding another force collinear and in opposite direction to F

B, Adding another force that passes through the center of

resistance

C, Adding a couple to counteract the moment created by F

D, Adding a moment that leads to counter clockwise rotation of

the tooth

E, Nothing. This is impossible to achieve in orthodontics.

A

C, Adding a couple to counteract the moment created by F

41
Q

(i) Orthodontic forces can be treated mathematically

as vectors.

(ii) Forces produce either translation, rotation or a

combination depending upon the relationship of the

line of action of force to the Center of resistance of

the tooth.

A. (i) is true ; (ii) is false

B. (i) is true ; (ii) is true

C. (i) is false ; (ii) is false

D. (i) is false ; (ii) is true

A

B. (i) is true ; (ii) is true

42
Q

Which one of the following removable appliances may be used to correct an anterior deep overbite in a growing patient

A. Anterior bite plate

B. Posterior bite plate

C. Full-coverage Essix retainer (similar to Invisalign trays)

D. Mandibular Hawley retainer with a canine to canine labial bow

E. Spring retainer

A

A. Anterior bite plate

43
Q

Which one of the following is not normally considered a functional appliance used to stimulate mandibular growth by posturing the mandible forward?

A. Activator

B. Cervical-pull Headgear

C. Twin-block

D. Jasper Jumper

E. Herbst Appliance

A

B. Cervical-pull Headgear

44
Q

Which of these class II correctors relies on patient’s compliance?

A. MARA

B. Herbst

C. Forsus

D. Bionator

A
45
Q

Engaging a stainless steel archwire in two adjacent teeth/brackets that are not well aligned would be easier than engaging a nickel titanium archwire of the same dimension in the same teeth/brackets. Having a greater inter-bracket distance between the two teeth would make engaging the archwires easier.

A. Both statements are true

B. First statement is true, second statement is false

C. First statement is false, second statement is true

D. Both statements are false

A

D. Both statements are false??

46
Q

When using non-pre-adjusted Edgewise appliances, orthodontists need make ___ to compensate for the variable thickness of buccal surface contours of individual teeth.

A.First-order bends

B.Second-order bends

C.Third-order bends

D.T-loops

E.No additional bends

A

A.First-order bends

47
Q

The following appliances can be considered a removable retainer EXCEPT:

1) Hawley appliances
2) Twin blocks
3) Tooth positioner
4) Lingual bonder retainer
5) Spring retainer

A, 1), 3) and 4)

B, 2) and 4)

C, 2), 3) and 4)

D, 2), 3) and 5)

E, 4) and 5)

A

B, 2) and 4)

AU14 Orthodontics (11 decks)

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