Ceph Skeletal AP Measurements Flashcards

1
Q

SNA Angle

A

Lines: Sella-Nasion, Nasion-A Point

Measure: inner angle between lines

Indicates: Anteroposterior position of Maxilla

Norm: 82 +/- 4

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2
Q

SNB Angle

A

Lines: Sella-Nasion, Nasion-B Point

Measure: Inner angle between lines

Indicates: Anteroposterior position of mandible

Norm: 80 +/- 4

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3
Q

WITS Analysis

A

Lines: Occlusal plane, Perpendicular point between A point and B point

Measure: between lines

Indicates: AP Maxillary/mandibular relation

Norm: Male = -1mm, Female = 0mm

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4
Q

A Point to Nasion Perpendicular

A

Lines: Frankfort Horizontal, N Perpendicular

Measure (mm): to A point, at right angle to N perpendicular

Indicates: anteroposterior position of maxilla

Norm: +1mm +/- 2.5

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5
Q

Pogonion to Nasion Perpendicular

A

Lines: Frankfort horizontal, N Perpendicular

Measure: right angle to N Perp, to pogonion

Indicates: anteroposterior position of mandible

Norm:

Males = 0mm +/- 2mm

Females = -2mm +/- 2mm

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6
Q

Maxillary AP Excess

(PROTRUSION)

A

Norm = 82 +/- 4

Between 1st and 2nd SD

Mild AP excess (this photo = SNA = 89)

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7
Q

Maxillary AP excess #2

(PROTRUSION #2)

A

A point to Nasion Perpendicular

Norm = +1mm +/- 2.5

This picture: A-N Perp = 5.5 mm

Between 1st and 2nd SD

Mild maxillary AP excess

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8
Q

Mandibular AP Deficiency

(RETRUSION)

A

SNB Angle Norm = 80 +/- 4mm

In this = SNB = 75 degrees

Between 1st and 2nd SD

Mild Mandibular AP Deficiency (retrusion/retrognathia)

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9
Q

Mandibular AP Deficiency #2

(RETRUSION #2)

A

Pogonion to Nasion Perpendicular

Norm = -2mm +/- 2 (female)

This picture: Po-N Perp = -8mm

between 2nd and 3rd SD

Moderate mandibular AP deficiency

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10
Q

Maxillary AP Deficiency

(RETRUSION)

A

SNA Norm = 82 +/- 4

This pic = 75

Between 1st and 2nd SD

Mild AP deficiency

Some mandibular excess

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11
Q

Maxillary AP Deficiency #2

(RETRUSION #2)

A

A point to Nasion Perpendicular

Norm = +1 mm +/- 2.5

This pic = AP Perp = -6mm

Between 2nd and 3rd SD

Moderate maxillary AP deficiency

Mandible slight AP excess

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12
Q

Mandibular AP Excess

(PROGNATHIC)

A

SNB Angle Norm = 80 +/- 4

This pic = SNB = 95

3+ SD

Severe Mandibular AP Excess

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13
Q

Mandibular AP Excess #2

(PROGNATHIC #2)

A

Pogonion to Nasion Perpendicular

Male Norm = 0 +/- 2 mm

This pic: Po-N Perp = +21 mm

3+ SD

Severe mandibular AP excess (holy shit)

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14
Q

Condylion to A Point

A

Lines = Co-A

(Measure between Co and A point)

Indicates = AP length of maxilla

Norm = use chart; depends on AP position of maxilla; can be used to find norm for mandibular length and vertical

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15
Q

Condylion to Gnathion

A

Lines = Co-Gn

(Measure between Co to Gn)

Indicates = AP length of mandible

Norm = use chart; found in chart relative to maxilla; can be used to find norm for maxillary length

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16
Q

If you want to quiz yourself on the chart - flip over

A