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ABO Written Exam > Coffee #2 Document pt. 4 > Flashcards

Coffee #2 Document pt. 4 Flashcards

1
Q

What is the ideal percentage of the lower facial height?

a. 45%
b. 55%
c. 35%
d. 65%

A

b. 55%

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2
Q

The choice of occlusal plane can alter the results. If the functional occlusal plane is used as opposed to the bisected occlusal plane a higher correlation to the ANB angle is noted

a. True
b. False

A

True

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3
Q

In a 16 yo female, the normal ratio of upper facial height (N - ANS) to lower facial height (ANS-M) is:

A

43:57

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4
Q

In an 11 y/o male, the lower facial height is expected to increase:

a. 3mm/year
b. 1mm/year
c. 2mm/year
d. 2.5mm/year

A

1 mm/year

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5
Q

What happens to the facial angle and the mandibular plane angle as a person ages?

a. The facial angle increases and the mandibular plane angle decreases
b. The facial angle decreases and the mandibular plane angle increases
c. The facial angle decreases and the mandibular plane angle decreases
d. The facial angle increases and the mandibular plane angle increases

A

a. The facial angle increases and the mandibular plane angle decreases
* b/c mandibular grows forward

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6
Q

What line is not an esthetic line?

A

I-line

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7
Q

Best way to have someone position for most stable head position

A

Look into mirror or distant object

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8
Q

Upper lip soft tissue to chin ratio

A

3:1

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9
Q

In complete nasal obstruction, there’s an immediate change of head posture measured by an increase in craniofacial angle of about

a. 5 degrees
b. 15 degrees
c. 25 degrees
d. 50 degrees

A

a. 5 degrees

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10
Q

What happens to the MPA when downward growth of the maxilla plus tooth eruption is greater than growth of the ramus?

a. It increases
b. It decreases
c. It stays the same

A

a. It increases

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11
Q

The most difficult to point locate on a ceph is?

a. A point
b. B point
c. Sella
d. Ar

A

a. A point

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12
Q

Which of these points is a constructed point

a. Subnasale
b. Articulare

A

b. Articulare

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13
Q

Which of the following is a midline structure on a lateral ceph?

a. Opisthion
b. Point A
c. Menton
d. Orbitale
e. Porion

A

Point A

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14
Q

Which of the following is usually in the midline on a PA ceph?

a. Menton
b. A point
c. Jugulae

A

a. Menton

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15
Q

Unreliability of Frankfort Horizontal (FH) as horizontal reference line in cephalometrics stems from:

  1. Difficulty of locating point Suborbitale
  2. Difficulty of locating point Porion
  3. The true horizontal may show a divergence of up to 10 degrees from FH

a. A & B only
b. B & C only
c. A & C only
d. A, B & C

A

d. A, B & C

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16
Q

What can be used as a substitute to locate porion?

a. Internal meatus
b. Maxillary tuberosity
c. Ear rod
d. Frankfort horizontal

A

c. Ear rod

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17
Q

Which point is associated with the occipital condyle?

a. Fulcrum point
b. Bolton point
c. Basion point

A

b. Bolton point

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18
Q

Downs analysis use as reference plane..

a. S-N
b. FH
c. N-Ba

A

b. FH

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19
Q

Downs analysis used what for superimposition?

A

Broadbent registration point

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20
Q

What is the name of the intersection between the Bolton-nasion line and a perpendicular from sella?

a. Witz registration point
b. Broadbent registration point
c. Jarabak registration point
d. Holdaway registration point

A

b. Broadbent registration point

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21
Q

Steiner analysis is the first modern cephalometric analysis to:

  1. Emphasize the interrelationship between individual measurements into a pattern
  2. Offer specific guides for use of cephalometric measurements in treatment planning
  3. Establish different cephalometric norms for different ethnic groups
  4. Use a cross-sectional study to establish cephalometric norms
    a. A&B only
    b. B&C only
    c. A&C only
    d. All of the above
A

a. A&B only

22
Q

Steiner uses:

A

a. L1-N-B/Pg-N-B

Holdaway

23
Q

Which ratio is used to see the relationship between the lower incisors and the chin?

a. Holdaway ratio
b. Ricketts ratio
c. Bolton ratio
d. Jarabak ratio

A

a. Holdaway ratio

24
Q

One of the major strengths of the McNamara analysis is:

a. Any one measurement is not affected by others within the same face
b. The difference in sagittal positions of the jaws is projected to SN line
c. The normative data are based on a well defined sample
d. None of the above

A

c. The normative data are based on a well defined sample

25
Q

What analysis uses the Facial angle (FH-N-PG)

A

Ricketts

26
Q

According to Ricketts, the Frankfort Horizontal most closely parallels

a. Palatal plane
b. SN
c. Occlusal Plane
d. Mandibular Plane

A

a. Palatal plane

27
Q

What does Rickett’s measure?

a. Frankfort horizontal
b. SN
c. Palatal plane
d. Occlusal plane

A

a. Frankfort horizontal

28
Q

What is the Rickett’s E-line?

A

Soft tissue Po to tip of nose

29
Q

What are common and stable reference lines when tracing successive cephs?

a. Nasion-B point
b. Nasion-A point
c. Frankfort horizontal
d. Facial axis

A

Frankfort Horizontal

30
Q

What is the best point from which to measure the protrusion of the upper incisor?

a. SNA
b. Facial angle
c. Frankfort horiontal

A

a. SNA

31
Q

The major advantage of cephalometric radiographs in treatment of children & adolescents is:

a. Evaluation of dentofacial proportions
b. Screening for pathologies
c. Study changes in jaw and tooth position brought about by growth and treatment
d. None of the above

A

c. Study changes in jaw and tooth position brought about by growth and treatment

32
Q

Patient has antegonial notch on ceph, how do you know if right or left side when the notch is on the inferior border of the mandible?

a. Right side will be magnified
b. Left side will be magnified
c. You won’t

A

a. Right side will be magnified

33
Q

Where does the petrous bone lie on a PA ceph radiograph?

a. Upper 1/3 of orbit
b. Inferior 1/3 of orbit
c. Roof of orbit
d. Floor of orbit

A

b. Inferior 1/3 of orbit

Petrous part of temporal bone

34
Q

On PA radiograph, what is the oblique line on the orbit?

A

Temporal line

Temporal surface of oblique line of sphenoid

35
Q

The temporal bone on a PA ceph appears as a line on?

a. Superior 1/3 of the orbit
b. Middle 1/3 of the orbit
c. Inferior 1/3 of the orbit
d. None of the above

A

b. Middle 1/3 of the orbit

36
Q

Where does part of temporal bone cross orbit on PA ceph?

a. Bisect orbit
b. Upper 1/3 of orbit
c. Lower 1/3 of orbit
d. Floor of orbit

A

a. Bisect orbit

37
Q

The radiopaque line that passes obliquely through the orbits on a posterioranterior ceph is which bone?

a. Ethmoid
b. Sphenoid
c. Temporal
d. Parietal

A

Sphenoid

It is the temporal line - temporal surface of the greater wing of the sphenoid

38
Q

What is the name of the midline point at the most inferior point of the maxillary alveolus?

a. Supradentale
b. Subdentale
c. Labialdentale

A

a. Supradentale

39
Q

A good measure of the severity of a malocclusion is the AB line to

a. Occlusal plane
b. Mandibular plane
c. Frankfort horizontal
d. Facial plane (N-Pg)

A

Occlusal plane

40
Q

If angle of convexity is normally zero & you measure -5, what type of malocclusion is it?

a. Class I
b. Class II div I
c. Class II div 2
d. Class III

A

d. Class III

angle of convexity N-A-Pg
When + –> Class II
When - –> Class III

41
Q

On a view of a lateral ceph with the second molars and E’s present, how old is the pt.?

a. 13 years
b. 9 years
c. 11 years
d. 15 years

A

c. 11 years

42
Q

If a lower incisor to GoGn changed from 105 to 95, how many mm of mand. space is necessary?

a. 10 mm
b. 8 mm
c. 6 mm
d. 4 mm

A

b. 8 mm

43
Q

What is the best method to measure mandibular growth changes?

a. Serial superimpositions (longitudinal method)
b. Cephs of parents
c. Ceph at one point in time (metric method)
d. Implant study (structural method)

A

a. Serial superimpositions

44
Q

Looking at a hand-wrist XR determine how much growth still remains

A

2 years with sesamoid ossification

45
Q

What is the average difference between S-N and Frankfort horizontal?

a. 3 degrees
b. 7 degrees
c. 10 degrees
d. 13 degrees

A

b. 7 degrees

46
Q

Cephalometrics is best used to determine

a. Skeletal pattern
b. Dental pattern
c. Dental pattern related to the skeletal pattern
d. None of the above

A

c. Dental pattern related to the skeletal pattern

47
Q

The major limitation of the Wits analysis is:

a. Unreliability of using the functional occlusal plane in open-bite cases
b. Failure of distinguishing between skeletal and dento-alveolar discrepancies
c. Lack of normative data for various ethnic groups
d. None of the above

A

b. Failure of distinguishing between skeletal and dentoalveolar discrepancies

48
Q

In utilizing, which appraisal is a determination of the relationship between the maxilla and the mandible?

a. Wits
b. SNA
c. Facial Axis (Ba-Pt-Gn)
d. E-Line

A

a. Wits

49
Q

Wits analysis uses which plane for reference?

a. Frankfort
b. Occlusal
c. SN
d. Palatal

A

b. Occlusal

50
Q

T/F, the Facial axis remains relatively constant with age?

A 
True
Facial Axis (Ba-N to Pt-Gn)

ABO Written Exam (24 decks)

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