Ortho - Lecture 7: Problems in Mixed Dentition

Question 1

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

Answer 1

Interferences w/ eruption
Lack of space

Question 2

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

Answer 2

Space analysis

Question 3

Amount of space available vs. amount of space needed

Answer 3

Space analysis

Question 4

How do you figure out space available?

Answer 4

Measure arch length

Question 5

How do you figure out space needed?

Answer 5

Add widths of each tooth

Question 6

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

Answer 6

Estimate with:

X-Rays
Proportionality tables
Combo of both

Question 7

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

Answer 7

Leeway Space (e space)

Question 8

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

Answer 8

1.5mm

Question 9

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

Answer 9

2.5mm

Question 10

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

Answer 10

Regaining

Question 11

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

Answer 11

3mm

Question 12

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

Answer 12

3-4mm; severe

Question 13

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

Answer 13

Maxillary

Question 14

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

Answer 14

Increased anchorage for removable appliances due to palate
Headgear

Question 15

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

Answer 15

Fixed or removable appliance

Question 16

How can molars be bodily moved to regain space?

Answer 16

Fixed appliance only

Question 17

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

Answer 17

2-3mm

Question 18

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

Answer 18

Hawley retainer w/ fingerspring
Pendulum appliance
Distal Jet appliance
Headgear

Question 19

Which appliance to help regain space in maxilla?

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

Answer 19

Hawley retainer w/ fingerspring

Question 20

Which appliance to help regain space in maxilla?

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

Answer 20

Hawley retainer w/ fingerspring

Question 21

Which appliance to help regain space in maxilla?

Fixed appliance used to distalize molars bilaterally

Answer 21

Pendulum appliance

Question 22

Which appliance to help regain space in maxilla?

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

Answer 22

Pendulum appliance

Question 23

Which appliance to help regain space in maxilla?

Fixed appliance used to distalize molars unilaterally or bilaterally

Answer 23

Distal Jet appliance

Question 24

Which appliance to help regain space in maxilla?

Uses palate as anchorage

Answer 24

Distal Jet appliance

Question 25

Which appliance to help regain space in maxilla?

Most effective and straightforward method to move molars distally

Answer 25

Headgear

Question 26

Which appliance to help regain space in maxilla?

Advantage: no reciprocal incisor protrusion

Answer 26

Headgear

Question 27

Which appliance to help regain space in maxilla?

Disadvantage: compliance (minimal of 14 to 16 hours per day required)

Answer 27

Headgear

Question 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?

Answer 28

Fixed space maintainer

Question 29

Mandibular space regaining is not as effective as maxillary space regaining because appliances are more ___________ and prone to breakage

Answer 29

fragile

Question 30

Mandibular space regaining appliances do not fit as well and there is not palatal anchorage support.

Question 31

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