Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Ortho 1 Lab > Lab 3 > Flashcards

Lab 3 Flashcards

1
Q

• a line connecting S to Na

A

Sella-Nasion (S-N)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

• a line connecting Po to Or

A

Frankfort Horizontal (FH)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

• a line connecting Go to Me

A

Mandibular Plane (MP)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

• a line connecting Se to Pg

A

Y-axis (Y)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

• a line connecting Na to ANS

A

Upper Anterior Facial Height (UAFH)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

• a line connecting ANS to Me

A

Lower Anterior Facial Height (LAFH)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

• a line connecting Na to A

A

• Nasion-A point (Na-A)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

• a line connecting Na to B

A

• Nasion-B point (Na-B)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

•These 2 angle indicates the A-P
position of the maxilla relative to
the cranial base.

A

Sella- Nasion-A point

NA-FH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q 
SNA angles:
•>\_\_\_ - protrusive or prognathic 
maxilla
•< \_\_\_\_ - deficient or retrognathic
maxilla
A

85°

79°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

NA-FH angles
•>___ - protrusive or prognathic maxilla
•

A

94

86

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

•A true vertical line dropped from N and
horizontal distance parallel to this true
vertical line is measured from A- Point.
•This measurement describes the position
of apical base of Maxilla in relation to
Nasion.

A

N Perpendicular to A-Point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

is the most anterior measure point of the mandibular apical base.
•This angle expresses the A-P position of the mandible relative to the cranial base using B-point as a cephalometric landmark.

A

•Sella - Nasion - B point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

SNB measurements:
•>___° - prognathic mandible
•

A

82

76°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

, measures the degree of protrusion and retrusion of the chin but uses Frankfort Horizontal as a reference plane.
• It also indicates the horizontal position of the mandible relative to the cranial base.

  • Note: Using all three angles and both reference planes, the clinician can make a good evaluation of the position of the mandible and determine whether the mandible is normal, protrusive or retrognathic.
  • In addition, the prominence of the chin may also be determined.
  • It is possible to have a retrognathic mandible but prominent chin.
A

• SN-Pg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

• SN-Pg measurements
• >__ - prognathic mandible
•

A

91°

83°

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q
  • This angle represents the extent of chin prominence relative to the reference plane SN.
  • It also indicates the A-P position of the mandible relative to the cranial base using pogonion as landmark.
A

SN- Pog

18
Q

SN-Pog measurements
•>__ - prognathic mandible
•

A

83°

77°

19
Q 
•It is obtained by measuring the 
horizontal distance between Pog and 
Nasion perpendicular.
•This measurement describes the 
position of the Mandibular Chin in 
relation to Nasion.
A

N Perpendicular to Pog

20
Q

The ___ angle measures the relative
position of the maxilla to mandible.
= SNA - SNB

A

ANB

21
Q

A _____ (+ or -) ANB angle indicates that the
maxilla is positioned anteriorly relatively to
the mandible. • Skeletal Class I or Class II.

A

positive

22
Q

A _____ (+ or -) ANB angle indicates that the
maxilla is positioned posteriorly relative to
the mandible.• Skeletal Class III.

A

negative

23
Q

•Drawing occlusal plane (OP), which is a line
through maximum cuspal Interdigitation of the
molars and premolars.
•Drawing a perpendicular line from Point A on
maxilla and Point B on mandible.
•The point of contact on the occlusal plane from
A and B are labelled AO and BO respectively.

A

Wits Appraisal

24
Q

•In normal occlusion BO is 1 mm ____ to point AO.

A

anterior

25
Q

•In skeletal _____ point BO is located posterior to point AO.

A

class II

26
Q

•In skeletal _____ point BO is anterior of point AO.

A

class III

27
Q

The ______ is represented by a line which bisects the distance between the left and right mandibular lower borders and connects anteriorly with Menton.
-can also be used as a measure of mandibular growth and lower facial growth direction.

A

mandibular plane

28
Q
  • Angle between Sella –Nasion and the line connecting Sella to Gnathion.
  • is an estimate of mandibular growth direction. • A larger angle indicates a more downward and vertical growth direction of the mandible.
  • A smaller angle indicates a more horizontal and anterior growth direction of the mandible.
  • It also indicates the degree of downward and forward position of the chin in relation to the upper face.
A

Y-Axis

29
Q

Nasion to ANS

A

UAFH

30
Q

ANS to menton

A

LAFH

31
Q

UAFH/LAFH ratio <0.8 indicates a greater LAFH, or ____ lower anterior face height.

A

longer

32
Q

UAFH/LAFH ratio >0.8 indicates a smaller LAFH, or ______ lower anterior face height.

A

shorter

33
Q

•This angular measurement determines the
inclination of the central incisor relative to
the anterior cranial base.
•A greater than average angle indicates
proclination (labioversion) of incisors as
often seen in Class II/D1.
•A smaller than average angle indicates
upright or retroclined (lingually inclined)
incisors as often seen in Class II/D2.

A

U1 to SN

34
Q

•The relationship of the maxilary central incisor to
the N-A reference line is used to establish the
position of the maxillary incisors relative to the
maxillary apical base.
•Both the inclination of the long axis of the incisor to
the line and the distance of the labial surface of the
incisor in front of the line are measured.
•The inclination indicates whether the tooth has
been tipped to its position or moved bodily.

A

U1 to NA

35
Q
  • The millimeter distance establishes the prominence of the incisors relative to the supporting bone.
  • Labially inclined (proclined) incisors will have a greater than average angular and linear measurement (Class II / D1).
  • Upright (retroclined) incisors will have a smaller than average angular and linear measurement (Class II /D2).
  • Positive values are recorded if the labial surface of the incisor is anterior to the NA line, negative values if posterior.
A

Nasion- A point

36
Q

•The relationship of the mandibular central incisor
to the N-B reference line is used to establish the
position of the mandibular incisors relative to the
mandibular apical base.
•Both the inclination of the long axis of the incisor
to the line and the distance of the labial surface of
the incisor in front of the line are measured.
•The inclination indicates whether the tooth has
been tipped to its position or moved bodily.

A

L1 to NB

37
Q

• The millimeter distance establishes the prominence of
the incisors relative to the supporting bone.
• Labially inclined (proclined) incisors will have a greater
than average angular and linear measurement (Class II /
D1).
• Upright (retroclined) incisors will have a smaller than
average angular and linear measurement (Class II /D2).
• Positive values are recorded if the labial surface of the
incisor is anterior to the NB line, negative values if
posterior.

A

Nasion - B point

38
Q 
•It defines the axial inclination 
between the mandibular incisor 
and the inferior border of the 
mandible. 
•The more the incisor is labially 
inclined, the greater the angle.
A

L1- MP

•IMPA (Incisor Mandibular Plane Angle).

39
Q 
•Measures the relative position 
along the long axis of the most 
anteriorly positioned maxillary 
and mandibular central incisors. 
•It determines the degree of labial 
inclination of the incisors. 
•The more proclined the incisors are, 
the less the angle.
•The more retroclined the incisors are, 
the more the angle.
A

Inter-incisal Angle

40
Q

runs from the tip of the nose to the soft tissue Pogonion.
•Lips are analyzed depending on the distance of them from it.
•Both lips should be behind this line.
• Upper: 2 -3 mm
• Lower: 1 –2 mm

A

E- line

Ortho 1 Lab (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions