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Ortho Lab > Cephalometrics > Flashcards

Cephalometrics Flashcards

1
Q

What are the uses of cephalometric technique?

A
  • Study of Craniofacial Growth.
  • Diagnosis of Craniofacial Deformity.
  • Planning Orthodontic Treatment.
  • Evaluation of Treated Cases.
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2
Q

What is a cephalostat?

A

holds the subject’s head in a fixed relationship to the central x-ray source

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3
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8
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9
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10
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11
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12
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13
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14
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15
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16
Q
A

Soft tissue profile

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17
Q
A

Crista galli

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18
Q
A

Greater wing of sphenoid bone

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19
Q
A

Outer table

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20
Q
A

Inner table

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21
Q
A

Frontal sinus

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22
Q
A

Floor of anterior cranial fossa (midline)

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23
Q
A

Floor of anterior cranial fossa (laterally)

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24
Q
A

Ethmoid sinus

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25
Q
A

Nasal bone

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26
Q
A

Zygoma

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27
Q
A

Pterygomaxillary fissure

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28
Q
A

Mandibular canal

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29
Q
A

Hyoid bone

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30
Q
A

Mandible

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31
Q
A

Soft palate

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32
Q
A

Maxilla

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33
Q
A

Maxillary sinus

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34
Q

What is an anatomic landmark?

A

Those that represent actual anatomic structures of the skull.

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35
Q
A

nasion

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36
Q
A

orbitale

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37
Q
A

anterior nasal spine

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38
Q
A

superior prosthion

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39
Q
A

subspinale

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40
Q
A

infradentale

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41
Q
A

pogonion

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42
Q
A

supramentale

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43
Q
A

menton

44
Q
A

gnathion

45
Q
A

gonion

46
Q
A

condylion

47
Q
A

basion

48
Q
A

posterior nasal spine

49
Q

What are derived landmarks?

A

Those that have been constructed or obtained secondarily from anatomic structures

50
Q
A

sella

51
Q
A

articulare

52
Q
A

pterygomaxillary fissure

53
Q
A

porion

54
Q
A

key ridge

55
Q

What are the different soft tissue points on a cephalometric?

A

a)Soft tissue glabella.
b)Pronasale.
c)Subnasale.
d)Labrale superius.
e)Labrale inferius.
f) Soft tissue pogonion

56
Q
A

soft tissue glabella

57
Q
A

pronasale

58
Q
A

subnasale

59
Q
A

labrale superius

60
Q
A

labrale inferius

61
Q
A

soft tissue pogonion

62
Q

A plane requires three points for definition; however, the cephalometric planes are only just lines connecting ______ points

A

two

63
Q
A

sella-nasion

64
Q
A

Frankfort horizontal (porion-orbitale)

65
Q
A

palatal plane (anterior nasal spine-posterior nasal spine)

66
Q
A

occlusal plane

67
Q
A

mandibular plane (gonion-menton)

68
Q

What are the horizontal planes on a cephalometric?

A

*sella-nasion
*frankfort horizontal
*palatal plane
*occlusal plane
*mandibular plane

69
Q

What two points are connected in the sella-nasion plane?

A

sella
nasion

70
Q

What two points are connected in the frankfort horizontal plane?

A

porion
orbitale

71
Q

What two points are connected in the palatal plane?

A

anterior nasal spine
posterior nasal spine

72
Q

What two points are connected in the mandibular plane?

A

gonion
menton

73
Q

What are the vertical planes on a cephalometric?

A

*Nasion-Subspinale (N-A)
*Nasion-Supramentale (N-B)
*Facial plane (N-Pog)
*Subspinale-Supramentale (A-B)
*Subspinale-Pogonion (A-Pog)

74
Q

What two points are connected in the facial plane?

A

nasion
pogonion

75
Q
A
76
Q
A
77
Q
A
78
Q
A
79
Q
A
80
Q

What is an SNA measurement?

A

Determines the anteroposterior relation of the maxilla to the cranial base. The inferior inside angle in which the SN plane intersects the NA plane.

Mean = 82

81
Q
A

SNA

82
Q

What is an SNB measurement?

A

Determines the anteroposterior relation of the mandible to the cranial base. The inferior inside angle in which the SN plane intersects the NB plane.

Mean = 80

83
Q
A

SNB

84
Q

What is an ANB measurement?

A

Determines the anteroposterior discrepancy of the maxillary to mandibular apical bases. The difference between SNA and SNB.

Mean = 2

85
Q
A

ANB

86
Q

What is an occlusal plane measurement?

A

Appraisal of the location of the teeth in occlusion to the face and the skull. Measure the angle of the occlusal plane to the SN plane.

Mean = 14

87
Q
A

occlusal plane

88
Q

What is a mandibular plane measurement?

A

Appraisal of the growth pattern. Measure the angle of the mandibular plane to the SN plane.

Mean = 32

89
Q
A

mandibular plane

90
Q

What is used to measure maxillary incisor position?

A

Mx. 1 – NA (nasion-subspinale)

91
Q

What is the mean for maxillary incisor position?

A

22 degrees 4mm

92
Q

What is this measuring?

A

maxillary incisor position

93
Q

What is used to measure mandibular incisor position?

A

Md. 1 – NB (nasion-supramentale)

94
Q

What is the mean for mandibular incisor position?

A

25 degrees 4mm

95
Q

What is this measuring?

A

mandibular incisor position

96
Q

What is the interincisal angle?

A

Relates the relative position of the maxillary incisor to that of the mandibular incisor.

97
Q

What is the mean for the interincisal angle?

A

131

98
Q

What is this measuring?

A

interincisal angle

99
Q

How do you use the S line to analize the soft tissue?

A
100
Q

What is the mean for the frankfort mandibular plane angle (FMA)?

A

25

101
Q

What is the mean for the mandibular incisor plane angle (IMPA)?

A

90

102
Q

What is the mean for the frankfort mandibular incisor plane angle (FMIA)?

A

65

103
Q

What are the angles of the diagnostic facial triangle?

A

*Frankfort mandibular plane angle – FMA
*Mandibular incisor plane angle – IMPA
*Frankfort mandibular incisor angle – FMIA

104
Q

What is Wits appraisal of jaw disharmony?

A
  • Measures the extent to which the jaws are related to each other anteroposteriorly.
  • Perpendiculars from points A and B onto the occlusal plane
105
Q

What is the mean and range of wits appraisal?

A

Mean = -1
Range = -2 to 4

106
Q

Hyper or Hypo divergent

A

Hyperdivergent

107
Q

Hyper or Hypo divergent

A

Hypodivergent

Ortho Lab (2 decks)

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