Ortho - Lecture 7: Problems in Mixed Dentition Flashcards

1
Q

Irregular and malaligned teeth in the early mixed dentition arise from what two major causes?

A

Interferences w/ eruption
Lack of space

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2
Q

When determining if you need to maintain space or regain space, what should you do?

A

Space analysis

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3
Q

Amount of space available vs. amount of space needed

A

Space analysis

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4
Q

How do you figure out space available?

A

Measure arch length

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5
Q

How do you figure out space needed?

A

Add widths of each tooth

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6
Q

How do you figure out space needed if a tooth is unerupted?

A

Estimate with:

X-Rays
Proportionality tables
Combo of both

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7
Q

The difference between the size of the larger primary molars and the smaller permanent premolars

A

Leeway Space (e space)

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8
Q

What is the Leeway Space in the maxilla (per side)?

A

1.5mm

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9
Q

What is the Leeway Space in the mandible (per side)?

A

2.5mm

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10
Q

___________ is required if there is not enough space or if succedaneous teeth are missing

A

Regaining

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11
Q

Up to _____ mm of space can be re-established in a localized area with relatively simple appliances and a good prognosis

A

3mm

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12
Q

More than ______ mm discrepancy between the amount of space available for the teeth and the amount of space required is a ________ problem

A

3-4mm; severe

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13
Q

Where is space easier to regain, the maxillary or mandibular arch?

A

Maxillary

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14
Q

Why is it easier to regain space in the maxillary arch?

A

Increased anchorage for removable appliances due to palate
Headgear

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15
Q

How can permanent maxillary 1st molars be tipped distally to regain space?

A

Fixed or removable appliance

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16
Q

How can molars be bodily moved to regain space?

A

Fixed appliance only

17
Q

Because molars tend to tip forward and rotate mesio-lingually, distal tipping for ______ mm of space regaining is often satisfactory

18
Q

What are 4 appliances to help regain space in the maxilla?

A

Hawley retainer w/ fingerspring
Pendulum appliance
Distal Jet appliance
Headgear

19
Q

Which appliance to help regain space in maxilla?

Removable retainer worn to regain space by tipping the permanent first molar distally

A

Hawley retainer w/ fingerspring

20
Q

Which appliance to help regain space in maxilla?

After space regaining, the space should be maintained with a band and loop or lingual arch

A

Hawley retainer w/ fingerspring

21
Q

Which appliance to help regain space in maxilla?

Fixed appliance used to distalize molars bilaterally

A

Pendulum appliance

22
Q

Which appliance to help regain space in maxilla?

Gains anchorage from the palate but uses helical springs to supply the distalizing force

A

Pendulum appliance

23
Q

Which appliance to help regain space in maxilla?

Fixed appliance used to distalize molars unilaterally or bilaterally

A

Distal Jet appliance

24
Q

Which appliance to help regain space in maxilla?

Uses palate as anchorage

A

Distal Jet appliance

25
Which appliance to help regain space in maxilla? Most effective and straightforward method to move molars distally
Headgear
26
Which appliance to help regain space in maxilla? Advantage: no reciprocal incisor protrusion
Headgear
27
Which appliance to help regain space in maxilla? Disadvantage: compliance (minimal of 14 to 16 hours per day required)
Headgear
28
Regardless of the method used to regain space, a space maintainer is required after adequate space has been established. What is the preferred space maintainer?
Fixed space maintainer
29
Mandibular space regaining is not as effective as maxillary space regaining because appliances are more ___________ and prone to breakage
fragile
30
Mandibular space regaining appliances do not fit as well and there is not palatal anchorage support.
31
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