Orthodontic Assessment

Question 1

What are the aims of orthodontic tx?

Answer 1

Functional
Stable
Aesthetic occlusion

Question 2

What are the risks of orthodontic tx?

Answer 2

Relapse
Root resorption
Decalcification

Question 3

What are the main headings we assess in ortho assessment?

Answer 3

CO

HPC

MH

SH, FH, DH

Extra Oral:
A/P
FMPA
Transverse - Asymmetry?
LAFH
Lips - competent, incompetent, lip trap
Naso-labial angle
Smile line

Intra-oral:
Teeth present
Teeth absent
Quality/prognosis of teeth
Incisor relationship
Molar relationship
OJ
OB
BPE
OH status
Centre lines
Crossbite
Canine relationship
Lower arch - crowding
Upper arch - crowding
Inclination of incisors

Question 4

What is the A/P relationship?

Answer 4

This s where we palpate the skeletal bases or assess visually - soft tissue point A and soft tissue point B

Question 5

What is A/P Class I skeletal base relatiobship?

Answer 5

Soft tissue A 2-3mm infront of soft tissue B

Question 6

What is A/P Class II skeletal base relatiobship?

Answer 6

Soft tissue A >2-3mm infront of soft tissue B

Question 7

What is A/P Class III skeletal base relatiobship?

Answer 7

Soft tissue A <2-3mm infront of B (B sometimes infront of A)

Question 8

How do we work out the FMPA??

Answer 8

Frankfort plane and mandibular plane and draw both lines and see where the join in relation to the occipit

Question 9

What is the frakfrot plane?

Answer 9

Lower border of orbital rim –> external auditory meatus

Question 10

What is the mandibular plane?

Answer 10

Lower border of mandible

Question 11

What is an average FMPA?

Answer 11

This Is when Frankfort plane and mandibular plane meet AT the occipit

Question 12

What is increased FMPA?

Answer 12

This is when Frankfort plane and mandibular plane meet ANTERIOR to the occipit

Question 13

What is reduced FMMPA?

Answer 13

This is where Frankfort plane and mandibular plane meet POSTERIOR to the occipit

Question 14

What is LAFH?

Answer 14

This is from the sub nasale to mention

Question 15

How do we assess face height?

Answer 15

LAFH : TAFH

should be 50::50 when assessing clinically

GLABELLA –> SUB NASALE –> MENTON

Question 16

How do we assess pts symmetry?

Answer 16

Look face on
look from above down to chin

Question 17

What do we assess in terms of the lip?

Answer 17

Competent or not

Question 18

What is competent lips?

Answer 18

This is when mentalis muscle is relaxed the lips join

Question 19

What is incompetent lips?

Answer 19

This is when mentalis is relaxed the lips dont touch - trauma risk as teeth exposed

Question 20

What is a lip trap?

Answer 20

This is when the lower lip gets behind the upper teeth and upper incisors rest on or are infrotn of the lip - this has high relapse risk unless we get lower lip sitting infrotn of teeth

Question 21

What is the Naso-labial angle?

Answer 21

Average
Inc
Red

Question 22

What is the smile line assessment?

Answer 22

High
Normal
Low

Question 23

What do we assess intra-orally?

Answer 23

Teeth present
Missing teeth
OH assessment
BPE
Poor prognosis teeth
Tooth quality

Question 24

What do we assess in each arch?

Answer 24

Crowding - mild moderate, severe
crowding/aligned/spaced

Question 25

What is classes as MILD, MOD and SEVERE CROWDING?

Answer 25

Mild <4mm Moder 4-8mm Severe >8mm

Question 26

What is the inclinations of the incisors?

Answer 26

Proclined average retroclined

Question 27

What are the incisor relationships?

Answer 27

Class I Class II Div I Class II Div II

Question 28

What is class I incisor relationship?

Answer 28

This is where the lower incisor edge occludes with or lies directly on cingulum plateau of the upper incisors

Question 29

What is class II Div I incisor relationship?

Answer 29

This is where the lower incisor edge occludes POSTERIOR to the cingulum plateau of the upper incisors The incisors can be proclined or of normal inclination and there can be an increased OJ

Question 30

What is Class II Div I relationship?

Answer 30

This is where the lower incisor edge occludes POSTERIOR cingulum plateau of the upper incisors This is where upper incisors are retroclined

Question 31

What is class III incisor relationship?

Answer 31

This is where lower incisor edge occludes ANTERIOR to cingulum plateau of upper incisors OJ CAN BE REDUCED OR REVERSED

Question 32

What is OJ?

Answer 32

This is the horizontal relationship of maxillary incisor to mandibular incisors Measure it in mm

Question 33

What is OB?

Answer 33

Vertical relationshio can be reduced average increased can be incomplete, complete (with tooth contact or palate contact) or traumatic

Question 34

What is a class I molar relationship?

Answer 34

Upper 6 MB cusp occludes with buccal groove of lower 6

Question 35

What is class II 50% molars?

Answer 35

This is where upper 6 MB cusp moves a Half unit mesially so upper 6 and lower 6 lie on top of each other

Question 36

What is class II 100% full unit molars?

Answer 36

This is where upper 6 MB cusp occludes anterior to the buccal groove of lower 6 - occludes onto the 5

Question 37

What is a class III molar relationship?

Answer 37

This is where upper 6 MB cause occludes posterior to the buccal groove of lower 6

Question 38

What is a class I canine relationship?

Answer 38

This is where upper canine occludes distal to lower canine

Question 39

What is class II canine relationship?

Answer 39

This is where upper canine occludes mesial to lower canine

Question 40

What is class III canine relationship?

Answer 40

This is where upper canine occludes very distal to the lower canine