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MODULE 2: CLINICAL SCIENCES “A” 54Q > Cephalometrics / Computer Techniques 34% 18Q > Flashcards

Cephalometrics / Computer Techniques 34% 18Q Flashcards

(90 cards)

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1
Q

what is the Holdaway ratio?

A

1:1 ratio for distance btwn L1 to NB and PG to NB

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2
Q

what is the reference plane for the Rickett’s analysis?

A

frankfort horizontal

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3
Q

In the Rickett’s analysis, what is the facial axis?

A

angle formed btwn basion-nasion plane and the plane from foramen rotundum to gnathion (PTM to Gn)

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4
Q

In the Rickett’s analysis, the facial axis norm is ___ degrees. Greater numbers means the chin is _____________, and lesser means the chin is _____________.

A

90 deg

retrognathic

prognathic

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5
Q

In the Rickett’s analysis, describe the change in facial axis from ages 8-18

A

no change

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6
Q

In the Rickett’s analysis, what two lines form the facial angle?

A

FH & N-Pg

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7
Q

In the Rickett’s analysis, the facial angle is used to:

A

measure the degree of retrusion or protrusion of the lower jaw

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8
Q

In Rickett’s analysis, the average facial angle is ___ deg.

A

88

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9
Q

In the Rickett’s analysis, describe the change in facial angle from ages 8-18

A

increases with age

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10
Q

The mandibular plane angle ( increases / decreases ) with age

A

decreases

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11
Q

E-Line extends from soft tissue tip of nose to soft tissue _________

A

popgonion

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12
Q

The lower lip should be -___mm being E-plane for a 9 y/o

A

-1mm

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13
Q

Which plane does Frankfort horizontal most closely parallel?

A

palatal plane

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14
Q

What is the reference plane for the Downs analysis?

A

Frankfort horizontal

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15
Q

what is Broadbent registration (or point R) used for?

A

superimpositions

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16
Q

A line between which two points makes the facial plane?

A

NPg

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17
Q

AB to NPg relates denture bases to each other and the skeletal profile. If the number is negative, this reflects a Class ____ relationship, if the number is positive, this reflects a Class ___ relationship.

A

II

III

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18
Q

The Y axis is an angle created by __________________- to ___ - ___

A

Frankfort Horizontal to SGn

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19
Q

The average value of Y axis is ___ degrees. Numbers larger than this value indicate a class ___ relationship and numbers smaller than this value indicate a class ___ relationship.

A

59

class II

class III

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20
Q

When treating a class II, we want the Y axis to ( increase / decrease )?

A

decrease

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21
Q

How does the Y axis change as we age?

A

It remains constant

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22
Q

Which cephalometric value is thought to define mandibular growth direction?

A

Y axis

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23
Q

Which two lines form the angle of convexity?

A

NA - APg

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24
Q

What does the angle of convexity measure? Positive number reflect a class ___ relationship while negative number reflects a class ___ relationship.

A

Maxillary prognathism

Class II

Class III

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25
describe Broadbent Registration and name which analysis it is used in
Intersection of Bolton- Nasion line and a perpendicular from Sella Downs
26
what is the reference plane for the Steiner analysis?
SN
27
SNA, SNB, ANB are used in which analysis?
Steiner's
28
In Steiner's analysis, the growth pattern is evaluated with:
MPA: Go-Gn to SN
29
The norms for U1-NA and L1-NB are both \_\_\_mm. For Holdaway's ratio, the ___ - NB should have the same value.
4 Pg
30
According to the S line, the lips should touch a line from ___ to middle of \_\_\_\_\_\_. The S line is part of the ________ analysis.
Pg nose lower border Steiner
31
The ___________ analysis was the first to offer specific guidelines for Tx planning
Steiner
32
The ___________ analysis was the first to emphasize interrelationship between individual measurements into a pattern
Steiner
33
The McNamara used a (well / ill) defined sample
well
34
The Tweed triangle is comprised of which 3 angles?
IMPA FMIA FMA
35
Ideal IMPA angle
90
36
Ideal FMA angle
25
37
High FMA angle is \>\_\_\_ and low FMA angle is
\>30 \<20
38
Ideal FMIA angle
65
39
In the Wits analysis a higher ANB correlation is noted due to the use of the ____________ occlusal plane is used as apposed to the ___________ occlusal plane
functional bisected
40
The functional occlusal plane uses molars and __________ while the Down’s occlusal plane uses the molars and bisects \_\_\_\_\_\_\_\_\_\_
premolars incisor OB
41
A negative Wits value indicates a lass ___ relationship while a positive Wits value indicates a class ___ relationship
III II
42
What is the major limitation of the Wits analysis?
it does not distinguishing between dental and skeletal problems
43
Name the reliable landmarks for mandibular superimposition (4)
Third molar crypt Inner cortical plate of symphysis Mandibular canal Inferior border
44
Name the reliable landmark for maxillary superimposition
Hard palate
45
Name the reliable landmarks for cranial base superimposition (3)
1. Anterior clinoid \*\* 2. Cribriform plate 3. Greater wing of sphenoid
46
What is a common stable reference for superimpositions?
Frankfort horizontal
47
Short Articulare to Pterygomaxillary fissure (Ar-PTM) demonstrates ____________ reflected in other analyses
retrognathia
48
anterior facial height is measured between which two points?
N-Me
49
posterior facial height is measured between which two points?
S - Go
50
ratio of AFH : PHF should be
60 : 40
51
upper facial height is measured between which two points? what is the average measurement?
N - ANS 60mm
52
lower facial height is measured between which two points? what is the average measurement?
ANS - Me 80mm
53
ratio of UFH : LFH should be
45 : 55
54
In a PA ceps, petrous portion of temporal bone lies in inferior\_\_/\_\_ of the orbit
⅓
55
In a PA ceps, the _______________ line is a radiopaque oblique line that passes through the orbits
temporal
56
In a PA ceps, the temporal line is formed by temporal surface of the:
greater wing of the sphenoid
57
Basion represents the most inferior-posterior point on the anterior margin of the __________ \_\_\_\_\_\_\_\_\_ on the ___________ bone
foramen magnum occipital
58
According to ABO standards, the MP is formed from which two points?
constructed Go Menton
59
According to the ABO discrepancy index, which cephalometric measurements are considered? (3)
IMPA ANB SN-MP
60
According to the ABO discrepancy index, which dental measurements are considered? (6)
1. OB 2. OJ 3. Crowding 4. Ant or Post crossbites 5. Ant or Post open bites 6. Alignment/occlusion
61
According to the ABO discrepancy index, what is the normal range of: SN-MP?
27**° -** 37**°**
62
According to the ABO discrepancy index, what is the normal range of: ANB
-2**° -** 6**°**
63
According to the ABO discrepancy index, what is the normal range of: IMPA
\< 99**°**
64
The ABO discrepancy index uses which measurement: FMA or SN-MP?
SN-MP
65
According to the ABO discrepancy index, what is the normal value of: SNA
82 deg
66
According to the ABO discrepancy index, what is the normal value of: SNB
80 deg
67
According to the ABO discrepancy index, what is the normal value of: SN-MP
33 deg
68
According to the ABO discrepancy index, what is the normal value of: FMA
24 deg
69
According to the ABO discrepancy index, what is the normal value of: U1-SN
103 deg
70
According to the ABO discrepancy index, what is the normal value of: L1-MP (IMPA)
95 deg
71
According to the ABO discrepancy index, what is the normal value of: UL - EP
-6mm
72
According to the ABO discrepancy index, what is the normal value of: LL-EP
-2mm
73
According to the ABO superimposition standard, reliable sagittal cranial base landmarks include: (2)
anterior sella wall greater wings of sphenoid
74
According to the ABO superimposition standard, reliable vertical cranial base landmarks include: (3)
ethmoidal crest cribriform plate of ethmoid walker point
75
According to the ABO superimposition standard, secondary cranial base landmarks include: (2)
planum sphenoidale cerebral surface of orbital part of frontal bone
76
According to the ABO superimposition standard, primary maxillary landmarks include: (1)
anterior surface of zygoma btwn orbital rim and key ridge
77
According to the ABO superimposition standard, secondary maxillary landmarks include: (1)
maxillo-zygomatico-temporal sulci
78
According to the ABO superimposition standard, primary mandibular landmarks include: (3)
anterior contour of chin below Pg inner contour of cortical plate at lower border IAN
79
According to the ABO superimposition standard, primary mandibular landmarks include: (1)
Mineralized tooth germ
80
According to ABO discrepancy index, a loss of \_\_\_+ points is a fail. It is desirable to have
30 20
81
What parameter is not used to evaluate Tx according to the ABO DI?
OB
82
According to the ABO discrepancy index, what is the normal angular difference between: FH and SN
7 deg
83
Name the components of the ABO CR index for evaluating treatment outcomes (8)
1. JAMIROCC: Overjet 2. root angulation 3. marginal ridge 4. inclination 5. rotations 6. occlusion 7. contact incisor position 8. contact occlusion
84
If you use Machine Porion instead of anatomic porion, you can expect FMA and Y-axis to ( increase / decrease )
increase
85
Cephalometric analysis was first done by:
Tweed
86
With age, we can expect the facial angle to ( increase / decrease ) and the MP to ( increase / decrease )
increase decrease
87
When considering esthetic lines, the E line is measured from _________ to ___________ and was used in the _________ analysis .
Tip of nose → soft tissue Pg Ricketts
88
When considering esthetic lines, the H line is measured as a tangent from _________ to ___________ and was used in the _________ analysis .
ST Pog → upper lip Holdaway
89
When considering esthetic lines, the B line is measured as a tangent from _________ to ___________ and was used in the _________ analysis .
St subnasale → ST Pog Burstone
90
When considering esthetic lines, the S1 line is measured as a tangent from _________ to ___________ and was used in the _________ analysis .
Center of S shaped nares curvature → ST Pg Steiner

MODULE 2: CLINICAL SCIENCES “A” 54Q (6 decks)

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