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Flashcards in Dental Relapse and Adults Deck (31)
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1

What are two major causes of orthodontic relapse?

1-Continued Growth
2-Tissue rebound

2

Active retention takes what two forms?

1-extra oral force in conjunction with retainers (head gear)
2-Funcitonal appliance

3

Which fibers keep teeth in contact and do not have an osseous attachment?

Periodontal Trans-septal fibers

4

What are two ways to deal with tissue rebound?

1-Over treatment
2-Adjunctive periodontal surgery

5

How much should you over treat class II, II or crossbite in order to overcome tissue rebound relapse?

1-2 mm

6

What are the 3 most popular types of retainers?

1-Hawley retainer
2-Clear essix
3-Bonded permanent retainer

7

What two types of bone can be identified according to pattern of collagen forming in osteoid?

1-Woven (haphazard organization)
2-Lamellar (parallel alignment)

*12 weeks for woven to mature to lamellar

8

How long does reorganization of the PDL take?

3-4 months

*Full time retainers during this time.

9

Which procedure involves cutting down to the crest of the alveolar bone around the labial and lingual gingival margins to sever periodontal fibers?

Circumferential supracrestal fibrotomy (CSF)

*alternatively, incisions through the papilla can be made

10

Severing periodontal fibers is most effective in reducing relapse of what?

Rotated teeth

11

A frena that is attached too closely to the gingival margin can cause what?

Gingival recession

*Also midline diastema

12

What are 6 benefits for adult orthodontics?

1-Cleansability
2-Correct osseous defects
3-Esthetics
4-Force eruption
5-Gingival embrasure correction
6-Improve spacing for implants

13

What hard to cleanse feature forms as the second molar drifts into the edentulous space where the first molar once was?

A pseudopocket

*ortho can correct this to make it more cleanable and restorable

14

_____ crown movement leads to increase space for implants and bridge while _____ root movement reduces space

Distal

Mesial

15

What is the likely cause of slow progress in the movement of molar uprighting?

Occlusal interference

16

What scenario of uprighting adult teeth will require a different approach and more time?

If both second and third molars need to be uprighted

17

What might need to be done if the patient needs a crown uprighted but has a steep mandibular angle?

Crown reduction to align with occlusal plane

18

Which type of periodontal defects can be improved with orthodontics?

1 wall and sometimes Two wall

*not used for 3 wall defects

19

How long after a bone graft can ortho be started?

6 months if the area is stable

20

Rather than using anatomy, what is used to determine bracket placement in adult patients?

Inter proximal Bone level

21

What bone level related lesion is the most difficult to maintain and can worsen during ortho?

Furcation lesions

*2-3 month recall schedules

22

Crown lengthening surgery should be done prior to orthodontic intrusion to achieve how much ferrule?

at least 1.5 mm

23

What is the typically freeway space?

2-4 mm

24

How does the bone and gingiva typically react to slow extrusion?

it follows the eruption of the tooth

*less likely with rapid extrusion but ankylosis becomes more likely

25

What is the ideal crown to root ratio

At least 1:1

26

If a tooth fractures to the level of the bone, how far must the tooth be erupted?

4 mm

*2.5 mm for biologic width and 1.5 for ferrule

27

The height between the deepest point of the gingival sulcus and the alveolar bone crest is called what?

Biologic width

*violating this causes iatrogenic periodontal disease

28

As a general rule the width of the root canal space should not be more than one third of what?

The overall width of the root

29

What are 6 criteria that determine if a tooth should be forcibly erupted?

1-Root length
2-Root form
3-Level of fracture
4-Importance of tooth
5-Esthetics
6-Endo/perio prognosis

30

If the entire crown is fractured 2 to 3 mm apical to the level of the alveolar bone how likely is it that you can erupt it for a restoration?

Very difficult if not impossible