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Orthodontic Nursing > Occlusion > Flashcards

Occlusion Flashcards

Buccal Incisor

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1
Q 
What is an ideal occlusion?
Molar 
Skeletal relationship
FMPA
Face height
A

Class 1 - upper 6MB cusp occludes in the buccal groove of the l6
Skeletal relationship Class 1 -Normal profile ( antero posterior) maxilla is 2-3mm anterior of the mandible
FMPA -28 degrees
Normal face height ( Vertical) Between eyes to under nose , under nose to chin ( upper and lower FH =)

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2
Q 
Ideal occlusion
Nasio labial angle
Lips
Centre lines
Facial assymetry
A

Nasio labial angle - 90-110
Competent lips
Centre lines coincident
No facial assymetry - transverse view

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3
Q

Ideal occlusion
Overbite
Over jet
Canine

A

Overbite- 1/3 lower incisor coverage
Overjet - 2-3mm
Class 1 - tip of the upper canine occludes between the lower canine and first pre molar

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4
Q

What are Andrews 6 keys?

A

Flat curve of spee/ occlusal plane
No rotations
No spaces
Class 1 molar relationship
Correct incisor crown angulation - all angled mesially
Correct crown inclination/tip-incisors angled buccal, labial, molars lingually

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5
Q

What are the three planes of space?

A

Antero posterior - Skeletal class
Vertical - facial 3rds
Transverse -horizontal ( u an l superior/inferior)

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6
Q

Why do you assess from 3 planes of space?

A

Cause of malocclusion - Genetic/environmental
To plan a realistic treatment plan
To understand what is important to patient (function/aesthetics)
To assess what is biologically possible - realistic expectations

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7
Q

How does extra oral assessment help in aetiology of malocclusion?

A

Helps assess cause
Genetic/environmental factors ( birth defects-cleft) Jaw shape ( AP)
Environmental factors- nail biting/pen chewing ( AOB increased LFH)
Crowding - ( Transverse facial assymetry)

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8
Q

Class 1 incisor classification

A

The lower incisor occludes, or lies below the cingulum plateau of the upper incisor

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9
Q

Class 2 Div 1 incisor classification

A

The lower incisor occludes posterior to the cingulum plateau of the upper incisor
The upper incisors are proclined

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10
Q

Class 2 Div 2 Incisor classification

A

The lower incisor occludes posterior to the cingulum plateau of the upper incisor
The upper incisors are retroclined

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11
Q

Class 3 Incisor classification

A

The lower incisor occludes anterior to the cingulum plateau of the upper incisor

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12
Q

The overbite is a two element definition

A

Increased /decreased

Complete/ incomplete

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13
Q

What is an increased overbite

A

The upper incisors cover more than a third of the lower incisors

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14
Q

What is a decreased overbite

A

The upper incisors cover less than a third of the lower incisors

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15
Q

What is a complete over bite

A

The lower incisors touch the upper incisors,teeth,roof of mouth, gum

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16
Q

What is an uncomplete over bite

A

The lower incisors don’t touch the upper incisors,teeth,roof of mouth or gum

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17
Q

What plane of space is an over jet measured

A

Antero posterior

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18
Q

What is a class 1 canine relationship

A

The upper canine occludes between the lower canine and first premolar

19
Q

What is a class 2 canine relationship

A

The upper canine occludes between the lower canine and lateral incisor

20
Q

What is a class 3 canine relationship

A

The upper canine occludes with the lower first and second pre molar

21
Q

What is a class 1 molar relationship

A

The upper 6 MB cusp occludes in the mesio buccal groove of the lower 6

22
Q

What is a class 2 molar relationship

A

The upper 6 MB cusp occludes mesially to the mesio buccal cusp of the lower 6

23
Q

What is a class 3 molar relationship

A

The upper 6 MB cusp occludes posterior to the distal buccal cusp of the lower 6

24
Q

What is a molar 1125

A

The upper 6 MB cusp is slightly anterior of the class1

25
Q

What is a molar 1150

A

the upper 6 mb cusp is directly over the lower 6 mb cusp

26
Q

What is a molar 1175

A

The upper 6 mb cusp is slightly posterior to the class 2 position

27
Q

Transverse assessment

Buccal cross bite definition

A

The upper pre molar, molar is palatal to the lower pre molar/molar

28
Q

Transverse assessment

Buccal scissor bite definition

A

The upper pre molar,molar is buccally to the lower pre molar/molar

29
Q

16 reasons why a ceph is used in diagnosis

A 
Diagnosis, aetiology of malocclusion, aid in txt plan.
Assess skeletal profile
Pre txt record
Monitor progress
Monitor growth
Check for TMJ
Check for fractures
Check for UE teeth
Check for impacted teeth
Check for fractures
Assess for roots
Evaluate teeth movement
Assess Jaw dev
Anchorage loss an req
Unexpected tooth movements
Treatment aims being acheived
30
Q

Points for Frankfort plane

A

Porion ( top of ear post) - Orbital (Base of eye socket)

31
Q

Points for maxillary plane

A

ANS - PNS

32
Q

Mandibular plane

A

Gonion - (Inferior point of mandible) - Menton (Chin)

33
Q

What equation is the angle ANB

A 
SNA-SNB Skeletal class
 3  +/-3
34
Q

SNA angle in degrees

A

Sella Nasion A Point 81 +/-3

35
Q

SNB angle in degrees

A

Sella Nasion B Point 78 +/-3

36
Q

FMPA angle in degrees

A

Frankfort mandibular plane angle

28 +/-4

37
Q

MMPA angle in degrees

A

Maxillary mandibular plane

27 +/-4

38
Q

UI max plane angle in degrees

A

109 +/-4

39
Q

LI mand plane angle in degrees

A

93 +/-6

40
Q

Interincisal angle in degrees

A

135 +/-10

41
Q

LI - A pog

A

+1mm +/-2mm

42
Q

What is the rickettes e line

A

The aesthetic line

43
Q

7 limitations of a Ceph

A 
Only suitable for Caucasions
2D image of 3D object
Operator error of plotting points
Pencil sharpness can intro errors in measuring angles
Depd on radiograph quality/print
Diff in locating points and landmarks
Patient position

Orthodontic Nursing (6 decks)

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