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Flashcards in Spacing Solutions Deck (69)
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1

What is the ideal amount of force for orthopedic changes with headgear?

250-450 g per side

2

What is the ideal amount of force for tooth movement with head gear?

100-200 gm per side

3

What are the 3 types of pull with headgear on the maxilla?

1-Occipital pull (restricts interior and anterior growth)
2-Cervical pull (restricts superior and anterior growth)
3-Combination pull (restricts anterior maxillary growth)

4

The mid palatal suture becomes increasingly ______ and _____ with age

tortuous and interdigitated

5

What are the three categories of crossbites?

1-Dental (teeth erupted into crossbite)
2-Functional (cusps cause shift to achieve max intercuspation)
3-Skeletal (normal dentition)

6

What are 6 methods of correcting crossbite?

1-Hyrax appliance
2-Haas appliance
3-Hawley removable expander
4-quad-helix
5-w arch
6-Transplantal arch

7

Midpalatal expanders separate more in the ______ than in the _____ and usually result in ____ to ___ amount of space

Anterior

Posterior

5 to 15 mm

8

Which type of expansion devices produce higher stress in both cortical and spongy bone from forces against the hard palate and alveolar bone?

Removable expander

*can also cause crown tipping and higher apical and crystal stresses

9

The outcome of rapid versus slow expansion looks very different at ___ weeks but similar at __ weeks

2

10

*Rapid has more skeletal expansion initially

10

The mandibular plane angle tends to ____ with growth

Decrease

*Due to up rotation anteriorly and down posteriorly. can be around condyle or centered within the body

11

Moving mandibular incisors forward more than what may cause stability issues?

2mm

12

canines are _____ stable if expanded however expansion across premolars and molars ____ be stable if not overdone

not

can

*2mm 1st premolar, 2-3 mm 2nd premolar, 3 mm molars

13

Though children won't do it because of the full time wear demands, what method remodels the TMJ joint and restrains mandibular growth?

Chin cup appliance

14

A delaire-type facemark does what?

pulls maxilla forward in class III patients like a reverse pull headgear

15

True growth stimulation results in what?

A larger mandible at the end rather that growth acceleration which results in the same size eventually but bigger initially

16

The frankel, bionator and activator, clark twin block and herbst appliances are all examples of what?

Functional orthodontic appliances that changes soft tissues or occlusion

17

What is the threshold for duration to move a tooth?

6 hours

18

Phase 1 treatment is performed before all primary teeth are lost and last how long?

6-12 months

19

The American Association of Orthodontists recommends every child be evaluated for orthodontics by what age?

8

20

Which permanent teeth tend to have the most crowding as the mandibular arch forms?

Mandibular incisors for about 2 years from when they come in

21

What three sources contribute to additional space to align mandibular incisors?

1-Slight increase in arch width between canines
2-Slight labial position of incisors
3-Distal shift of canines

22

What is the space called that results from the difference in larger primary molars and permanent premolars?

Leeway space or E space

*mand 2.5 mm each side. Max 1.5 mm each side

23

What is the mesial distal diameter of the maxillary and mandibular permanent teeth respectively?

Max-128 mm
Mand-126 mm

24

What age is the "ugly duckling" stage?

Around age 9

*flared max incisors may result in impacted canines

25

A maxillary central diastema of what size or less usually closes on its own?

2 mm

26

Premature loss of primary canines reflects what?

Insufficient arch size in the anterior region

*laterals cause canine to resorb

27

Palatal expansion should be done before what?

Adolescent growth Spurt

28

The most rapid loss of A-P distance in the arch is usually due to what?

Loss of the primary second molar

*a space maintainer should be placed

29

You do not need a space maintainer if a permanent successor will erupt within what time frame?

Within 6 months

30

Which type of space maintainer has a blade portion that extends 1 mm below the mesial marginal ridge of the erupting permanent tooth to guide its eruption?

Distal shoe