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OSCE CRAM > Interceptive Orthodontics > Flashcards

Interceptive Orthodontics Flashcards

(55 cards)

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1
Q

General pattern of eruption for deciduous teeth

A

ABDCE

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2
Q

Ideal spacing of deciduous to allow no crowding in permanent

A

> 6mm

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3
Q

Eruption dates of maxillary permanent dentition

A

Central - 7
Lateral - 8
Canine - 11
1st premolar - 10
2nd premolar - 10
1st molar - 6
2nd molar - 12

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4
Q

Eruption dates of mandibular permanent dentition

A

Central - 6
Lateral - 7
Canine - 9
1st premolar - 10
2nd premolar - 10
1st molar - 6
2nd molar - 12

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5
Q

What mm of crowding may spontaneously improve

A

Up to 3.5mm

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6
Q

Investigation indicated for laterals tilted distally

A

OPT - Developing canines impinging on 2d

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7
Q

When should the contralateral tooth erupt?

A

6mths

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8
Q

List reasons for UE1 (4)

A
  1. Supernumeraries
  2. Trauma
  3. Dilacerations
  4. Cysts/tumours
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9
Q

What is a retained deciduous tooth

A

Does not exfoliate once permanent tooth erupts

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10
Q

Implications of a significant dilaceration (3)

A

Poor prognosis
Straightening = root through bone labial plate
Loss of vitality + XLa

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11
Q

List reasons for median diastema

A
  1. Small teeth
  2. Supernumeraries
  3. Hypodontia
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12
Q

List some early mixed dentition interception issues (6)

A

> Impacted 6s
Crowding
Early loss of deciduous teeth
Carious 6s
Xbites
Habits

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13
Q

Define leeway space

A

Difference between CDE and 345

Maxillary
- 1.5mm wider than permanent

Mandibular
- 2.5mm wider than permanent

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14
Q

What is the minimum space required at 9yrs old, for premolars and canines?

A

18.5mm from 2d to 6m

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15
Q

How and when is a space requirement assessment carried out (3)

A

> Roughly 9yrs
Want 18.5mm to make room for permanent successors

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16
Q

Define balancing deciduous teeth

A

XLa same tooth on other side

XLa 16 - XLa 26

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17
Q

Define compensating deciduous teeth

A

XLa same tooth on opposing arch

If you lose U6 XLa L6

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18
Q

What does the effect of early loss of deciduous teeth depend on?

A

Age
Space available (greater effect if crowded dentition)

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19
Q

Management of early loss of A+B’s

A

NIL

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20
Q

Management of early loss of C’s

A

Balance

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21
Q

Why do we balance C’s?

A

Can cause midline shift

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22
Q

Management of early loss of D’s

A

NIL
Small centreline shift
Perhaps balance under GA not REQUIRED

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23
Q

Management of early loss of E’s

24
Q

Why do we not balance the loss of E’s?

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A

Major space loss but little effect to centreline

Results in significant mesial drift which will cause crowding issues

25
What arch is a mesial drift a bigger issue in?
Upper
26
Why do you want to compensate a 46 with a 16? (1)
Prevent overuption If not it will prevent mesial movement of the 2nd molar
27
When should 6s be XLa? (4)
> Bifurcation of 7s forming > 5s forming > 8s follicle forming > Class I malocclusion > Moderate lower/upper crowing
28
What appliance would be provided for a posterior unilateral Xbite?
Active component: Midline screw Retention: Adams clasps on 4s+6s Baseplate: PBP
29
Instruction for posterior Xbite appliance?
Wear it 24/7 Turn screw 1/4 no more than 2x a week
30
How long can it take to correct a posterior Xbite?
6-9mths Following this pt should wear the appliance inactivated at bed at night to prevent relapse
31
Effects of an anterior Xbite
Wear on incisal edge Gingival recession
32
What appliance would be used for an anterior Xbite on 11?
Active component: Z spring 21 Retention: Double adams on E's+6's Anterior retention: Adams clasps on 11 Baseplate: PBP
33
Why do we need anterior retention?
If no anterior retention the appliance will just drop down when Z is activated
34
Timeframe for successful anterior Xbite tx?
6-8wks Quicker than posterior
35
Why do we need a PBP to tx anterior/posterior XBites?
Pt must disocclude so we can push the tooth over the bite
36
What are the % for relapse for an anterior/posterior Xbite
ANTERIOR > Won't relapse > Once incisors over lower bite remains corrected POSTERIOR > 50% relapse > Why we over-correct
37
What are the features of a thumb sucking habit?
> Proclined upper incisors > Retroclined lower incisors > Posterior Xbite > AOB or reduced OB
38
Digit sucking habit breaker tx
1. Fixed habit breaker 2. Removable habit breaker - Double adams on Es+6s
39
What is the ideal age to get a habit sorted?
Under 10yrs - within 3yrs of eruption
40
What is an infra-occluded tooth?
Submerged tooth below the occlusal surface Ankylosed to bone
41
How do we diagnose an infra-occluded tooth?
> Visual > Percussion - dull cracked sound > Xrays
42
What is the treatment for a submerging molar?
> Take xrays > If permanent successor present observe for 1yr and submerging deciduous should exfoliate > Xla when only 1mm of crown left showing and threatens to go subgingival
43
Assessment checks of unerupted upper canine
1. Visual - tipping of laterals + wiggle C's for mobility 2. Palpate by 9-11 3. Take xray - PA/OPT
44
What does mobility of C show?
Means canine is resorbing the C
45
Which 2 radiographs would you take to demonstrate the position of an ectopic canine?
OPT + anterior maxillary occlusal
46
What 2 factors does the chance of success for XLa of cs to help ectopic canine erupt depend on? (2)
> How high the ectopic canine is > How much the ectopic canine overlaps the adjacent incisor
47
% success if ectopic canine doesn't overlap the adjacent lateral by more than 1/2
90%
48
% success if ectopic canine is more than halfway over the adjacent lateral
60%
49
What values for incisal angulation allow some room to correct a class III relationship?
Upper - <120 Lower - >80
50
Why can't we tip teeth over 120 to maxillary plane?
Gives us an OJ
51
What is camouflage tx?
Changing incisor relationship but accepting the underlying skeletal relationship
52
Example of growth modification functional appliances
Functional regulator Frankel 3
53
What class patient would you consider for maxillary protraction?
Class 3 under 10
54
How does a functional appliance work?
Promotes mandibular growth Restricts maxillary growth This all reduces OJ
55
Types of supernumerary teeth
Conical - close to midline - dont prevent eruption but can displace Tuberculate - main cause of failure to erupt Odontome - rare Supplementary

OSCE CRAM (38 decks)

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