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ortho 2 > Midterm > Flashcards

Midterm Flashcards

1
Q

What are the most commonly impacted teeth?

A

Maxillary Canines, which are second only to 3rd molars

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2
Q

Canine impaction due to genetic factors

A

Palatal Impaction

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3
Q

What % of people with canine impactions have bilateral canine impactions?

A

8%

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4
Q

What % of people have canine impactions? And how is it most common in?

A

2%

Is twice as common in females than it is im males

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5
Q

In what % of cases in the canine corwn distale to the midline of the lateral incisor?

A

91%

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6
Q

In what % of cases in the canine crown mesial to the midline of the lateral incisor?

A

64%

If the canine crown is mesial to the midline of the lateral incisor,
64% chance of proper eruption

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7
Q

What is Leeway space?

A

The space occupied by the primary canines and molars is greater than that required for the corresponding permanent teeth, the canine, and the two premolars. The size difference of the primary and the permanent teeth is referred to as the LEEWAY SPACE.

3mm in the Maxilla
5mm in the Mandible

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8
Q

What do you do if the patient has mesiodens?

A

Tx generally consists of extraction of the teeth when possible,
especially if it is resorbing the adjacent teeth

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9
Q

What do you do if a patient loses their primary incisors and one canine?

A

Extract the other canine

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10
Q

What % of the population are supernumary teeth are present in primary dentition?

A

0.8%

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11
Q

What % of the population are supernumary teeth are present in permanent dentition?

A

2.1%

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12
Q

What is required for serial extraction?

A

Multiple appointments

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13
Q

What are the necessary components to perform serial extraction?

A

1.) Class 1 Occlusion (posteriorly)
2.) Severe Crowding (>10mm)
3.) Normal bite or minimal overbite relationship
4.) No missing teeth

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14
Q

What is serial extraction?

A

Serial extraction is a clinical procedure that involves the timed sequence of extractions of certain primary and permanent teeth in mixed dentition to provide ideal occlusion and arch cohesiveness.

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15
Q

What is the order for serial extraction?

A

Primary canines -then-> primary first molars when 1/2 to 2/3 of the first premolar root is formed -then->first premolars so the permanent canines erupt in the remaining extraction space

1.) Primary canines are extracted first to provide space for the alignment of the incisors

2.) The primary first molars are extracted when 1/2 to 2/3 of the first premolar root is formed, to speed the eruption of the first premolars

3.)When the first premolars have erupted they are extracted and the canines erupt into the remaining extraction space

4.)The residual space is closed by drifting and tipping of the posterior teeth unless full appliance therapy is implemented.
Majority of space is taken out by permanent canines
Posterior segments move forward
Ideal Occlusion is still not confirmed, but crowding is no longer present. May still need
aligning devices (aka braces)

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16
Q

8 year old patient presents with no spacing - a diastema? What do you do?

A

Just watch it

because if pt is <11 years old, watch to see if canine eruption closes the diastema

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17
Q

T of F : Not all over-retained primary teeth are ankylosed

A

True

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18
Q

What kind of noise do ankylosed teeth give out?

A

A sharp solid sound on a percussion test in comparison to a cushion sound heard inthe normal teeth

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19
Q

What is distal shoe?

A

a fixed space retainer

which is a Band or Crown cemented on the first primary molar and has a distal extension up to the mesial of the first permanent molar.

The DISTAL SHOE extends to the molar and rests inside gum tissue to prevent mesial movement

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20
Q

An overall ratio greater than 77.2% for Bolton analysis indicates?

A

Indicates mandibular tooth excess because it’s Mand/Max

so over 77.2% means your numerator is bigger so Incr. in Mand measurement

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21
Q

Are labial or palatal impactions more common?

A

Palatal Impactions

22
Q

If the impacted canine is located past the midpoint of the lateral, what is the success rate?

A

64%

23
Q

What % of canine impactions are bilateral?

A

8%
Rv

24
Q

What is the definition of Leeway space?

A

Leeway Space =

Primary teeth (canines and molars) are bigger than the corresponding permanent teeth (canine and premolars)

25
Q

Patient has mesiodens - what should you do?

Radiograph also showed issues with the lower mandibular crowding as well as mandibular premolars that were developed enough to extract the primary molars. What should you do first?

A

Extract the Mesiodens?

RV

26
Q

Patient has lost mandibular primary incisors and one canine? What do you do?

A

Extract the opposite canine

RV

27
Q

What is true about serial extracts?

A

Multiple appointments are required

28
Q

What is a serial extraction?

A

Serial Extraction =

Timed sequence of extractions to alleviate future crowding issues in permanent teeth

29
Q

8 year old pt. with no spacing (normal spacing) - diastema? What is the best immediate treatment?

A

Just watch and monitor?

RV

30
Q

What is the least likely consequence of ankylosed primary tooth?

A

Would have ectopic eruption of the succedaneous tooth?

RV

31
Q

Pt has 2nd primary molar extracted and it is clear that permanent 1st molar is not fully erupted, what would you do?

A

Distal shoe to preserve that space and guide perm 1st molar as it erupts

RV

32
Q

Radiograph of Ectopic eruption of the 1st perm molar

A

Extract for extopic eruption and distalize it

RV?

33
Q

30 yo pt had previous ortho and got in a bar fight, #9 shows resorption and malocclusion.
What do you think may have happened?

A

Bar fight - ankylosis from trauma

34
Q

Pt w/ wack incisors, what do you do?

A

Refer or extract?

RV

35
Q

Pt has class 1 molar relationship after ortho but anteriors are still end to end. Why?

A

Mandibular excess for Bolton analysis

36
Q

What do you do for impacted molars?

A

Perio to expose, ortho to move and oral surgery for extraction

37
Q

Why do you extract mesiodens or impacted canines?

A

Because it will resorb the permanent lateral incisor

38
Q

Pano of pt that is missing about 8 teeth, how would you classify this?

A

Oligodontia b/c more than 6 teeth are missing

39
Q

T or F, serial extraction needs all permanent teeth?

A

False

40
Q

24 yo with over retained primary 2nd molars (AJKT) what would you do as a 16 year old extract?

A

Extract A, J, K and T

Extract H

Refer to Ortho?

not sure????? RV

41
Q

24 yo with over retained primary 2nd molars (AJKT) what would you do as a 16 year old extract? (same info) but quesiton is asking what would you do if you saw them at age 10?

A

Extract H and I (primary canine and 1st molar, so serial extraction)

42
Q

Tanaka and Johnston question

A

Add 11 for max and 10.5 for mand

Know how to calculate

43
Q

What is not good for assessing facial asymmetry?

A

Bite Registration

Posterior-anterior radiograph

RV?????

44
Q

What is the best x-ray to determine location of impacted canine?

A

CBCT

45
Q

Primary tooth A is lost, so..

A

You will lose Leeway space and get crowding

46
Q

What do you do if maxillary bilateral 1st and second primary molars are gone?

A

Nance

47
Q

What is wrong about thie pano?

A

Over retained Canine

Something like you would have the same on opposite side with another tooth

RV??

48
Q

When should you not extract a supernumary tooth?

A

If it is above the apex????

If it erupts in occlusion

RV??????????

49
Q

When should you do a serial extraction?

A

Severe crowding and class 1 malocclusion

50
Q

How do you determine crowding?

A

??

51
Q

Which does not cause spacing?

A

Macrodontia

ortho 2 (3 decks)

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