Orthodontic Diagnosis / Case Analysis / Tx Planning 14% 9Q

Question 1

Crowding of < ___mm can be resolved by non-extraction

Answer 1

4mm

Question 2

With crowding of ___ - ___mm, the best Tx would be non extraction, but Tx often requires extraction of teeth other than 8s

Answer 2

5 - 9mm

Question 3

To upright incisors by 2.5°, you would need ___mm space per side

Answer 3

1mm

Question 4

For a change of L1-GoGn (IMPA) from 105-95, ___mm space would be needed

Answer 4

8mm

Question 5

For each 1° of proclination, we gain ___mm of arch circumference

Answer 5

2mm

Question 6

The primate space is located:

Answer 6

MUCs

DLCs

Question 7

Leeway space is ___mm per side in the maxilla and ___mm per side in the mandible

Answer 7

1. 5
2. 5

Question 8

Leeway space is ___mm total in the maxilla and ___mm total in the mandible

Answer 8

3mm

5mm

Question 9

Leeway space produces a decrease in arch circumference from ___° to ___°

Answer 9

1° to 2°

Question 10

Maxillary leeway space is from which teeth?

Answer 10

Es

Question 11

Mandibular leeway space is from which teeth?

Answer 11

2. 0mm per side from Es
3. 5mm per side from Ds

Question 12

represents the additional space required to accommodate the permanent incisors when compared with the primary incisors

Answer 12

Incisor Liability

Question 13

Incisor liability in the maxilla is ___mm

Answer 13

7.6mm

Question 14

Incisor liability in the mandible is ___mm

Answer 14

6.0mm

Question 15

Incisor liability space is recaptured by:

1. Slight increase in ________________ width
2. Slight ________ positioning of permanent incisors
3. Distal shift of L3s into _________________ when primary molars exfoliate

Answer 15

1. intercanine
2. labial
3. primate space

Question 16

In serial extraction Tx cases, when are Cs are extracted ?

Answer 16

as soon as lower incisors erupt

Question 17

In serial extraction Tx cases, when are Ds are extracted ?

Answer 17

then ⅔ of the root of 4s is formed

Question 18

In serial extraction Tx cases, when are 4s are extracted ?

Answer 18

as soon as they enter the mouth

Question 19

A case representing indication for serial extraction would present with protruded teeth, Class ___ molars with ___+mm crowding

Answer 19

Class I

10mm+

Question 20

The key to serial extraction is to extract ___s before ___s erupt to shift crowding distally

Answer 20

4s before 3s erupt

Question 21

The average inter molar width for adolescents is

Answer 21

33-35mm

Question 22

The average inter molar width for adults is

Answer 22

35-39mm

Question 23

Incisor irregularity in untreated subjects:

1. ___% have no crowding
2. ___% have moderate crowding
3. ___% have severe crowding

Answer 23

50% none

23% mod

17% severe

Question 24

Incisor irregularity in untreated subjects is greater in

1. Males ___ Females
2. Whites ___ Blacks

Answer 24

Males > Females

Whites > Blacks

Question 25

Incisor irregularity in untreated subjects increases during ___________ but then levels off

Answer 25

early adulthood

Question 26

For every 1mm expansion, arch perimeter increases:

1. ___mm in inter molar width
2. ___mm in inter premolar width
3. ___mm in intercanine width

Answer 26

1. 0.25mm
2. 0.7mm
3. 1.0mm

Question 27

The greatest increase in arch perimeter is achieved by:

Answer 27

incisor advancement/proclination

Question 28

The correlation between tooth size and arch form is ( good / poor )

Answer 28

very poor

Question 29

name 3 factors to consider for canine substitution

Answer 29

Class II molar

Anterior tooth size relationship

Length, shape and color of canine

Question 30

An eruption ___________ is absolutely necessary for tooth eruption; if you drag a tooth’s crown against bone you see pathologic resorption which is also termed ____________ ____________

Answer 30

follicle

pressure necrosis

Question 31

A hyper divergent growth pattern ( can / cannot ) be identified early, (should / should not ) be treated early, and (does / does not ) self correct

Answer 31

can

should

does not

Question 32

Open bite can be diagnosed when the incisors are ___mm below the lip

Answer 32

3mm

Question 33

In skeletal open bites, _____________ _____________ is typically seen in the mandible in the ceph with a ( high / low ) MPA

Answer 33

antegonial notching

high MPA

Question 34

In skeletal open bites, it is typical to see an increased height in ( maxlilary / mandibular ) molars

Answer 34

maxillary

Question 35

What is the most common cause of developing open bites?

Answer 35

Degenerative arthritis

Question 36

___% of pre-pubescent open bites close spontaneously

Answer 36

80%

Question 37

• Cases: For a child with tongue thrust, (treat / don’t treat )*
• Proffit: “As long as the habit stops before the eruption of the _____________ ______________, most of the changes resolve spontaneously”*

Answer 37

• all tongue thrust questions say don’t treat*
• permanent incisor*

Question 38

For Tx of open bites, Little says ___ / ___ show incisor relapse and that Tx is unpredictable

Answer 38

⅔

Question 39

Is leveling the COS stable or unstable to relapse?

Answer 39

stable

Question 40

Which classification of class II patients is most prone to relapse?

Answer 40

Class II div 2 due to deep bite

Question 41

For the bolton index, the mandibular 6-6 is ___% of the maxillary 6-6 dentition

Answer 41

91%

Question 42

For the bolton index, the mandibular 3-3 is ___% of the maxillary 3-3 dentition.

Answer 42

77%