Invisalign Concepts (Lindauer) Flashcards

(34 cards)

1
Q

What uses a series of clear plastic aligners to put forces on teeth to move them?

A

Invisalign

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What was the difference with invisalign versus the positioners and spring aligners orthodontists had previously been using?

A

Digital aspect allowed for a series of trays so teeth could be moved in sequence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are 6 appropriate case types for Invisalign?

A
  1. Mild spacing (1-3mm)
  2. Moderate spacing (4-6mm)
  3. Mild crowding (1-3 mm)
  4. Moderate crowding (4-6mm)
  5. Narrow arches (dental, not skeletal)(4-6mm)
  6. Relapse cases that meet the above criteria
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Of the following, which are considered easier (therefore start with these) and what are harder (therefore treat these cases after experience): Space closure
Reproximation (with Interproximal reduction)
Dental Expansion
Flaring
Distalization
Lower incisor extraction

A

Easy: space closure, expansion, a little flaring

Difficult: distalization, lower incisor extractions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Are cases requiring rotation of premolars and canines appropriate for Invisalign?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Should invisalign be used in mixed dentition cases?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Should invisalign be used in cases to correct one arch when the opposing arch is being treated with fixed appliances?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the drawback with the literature on Invisalign

A

Mostly case reports, only a few scientific studies

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What did the Pearson, Trosien study show that is a huge advantage of invisalign?

A

Maintained or improved oral hygiene. The patient can take them out and clean.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

With the removable aspect of Invisalign, what is the big problem with them?

A

Compliance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does an activation in Invisalign mean?

A

A new tray

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is PAR?

A

Peer assessment rating. Measures occlusal complication. The higher the PAR, the more difficult the case

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The Bollen Study of 51 pts looking at hard and soft aligners in 1 week or 2 week activation cycles, as well as high and low PAR showed what for hard vs soft, and best length of time between activations?

A

2 week intervals better than 1 (37% vs 21%)
Low PAR better than high (38% vs 18%)
Soft vs hard: They use hard now, so it must be hard

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the drawback of the Bollen study?

A

Only 29% completed all aligners

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What was the finding of the Patel study that looked at the reduction of PAR pre-and post invisalign?

A

Average PAR reduction of 50.7%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

When invisalign and braces are compared with respect to reduction of PAR, which shows the better improvement?

A

Orthodontics (77% PAR decrease)

Invisalign (50.7% PAR decrease)

17
Q

What is a big difference when comparing the invisalign study versus the traditional ortho study with respect to PAR?

A

Orthodontics started with higher PAR and ended with lower PAR, where invisalign’s PAR was lower already at pretreatment

18
Q

Djeu study comparing comparable pre treatment PARs of invisalign versus traditional ortho showed what?

A

Ortho had lower PAR at end of treatment

19
Q

Which has better alignment early on, but relapses more: invisalign or traditional braces ?

20
Q

Lindauer’s study set up with 20 invisalign vs 20 braces matched for pre-treatment difficulty showed what overall improvement percentages?

A

91.8% improvement for conventional 68.7% improvement for Invisalign

21
Q

What is Little’s Irregularity Index?

A

Measures contact points between adjacent teeth and adds them together around the arch

22
Q

What did the Kravitz study show when he compared the Clin-Check software of invisalign to the actual final results after invisalign treatment?

A

Clin-check was 41% accurate

23
Q

Kravitz found the least accurate tooth movement for invisalign is what?

24
Q

Which tooth has better success for rotation with Invisalign: maxillary central or mandibualr canine?

A

Maxillary Central 54% success Mandibular canine 29.1% success

25
Krieger studied invisalign’s ability to correct anterior crowding via comparing differences in the Little’s Irregularity Index pre-and post-treatment. What did they find
Found Clin-Check was acceptable 5.39mm Little’s maxillary pretreatment 1.57mm Little’s maxillary posttreatment 5.96 mm Little’s mandibular pretreatment 0.82 mm Littles mandibular posttreatment
26
Krieger study said clin-chek predicted well everything EXCEPT what prediction?
Overbite correction
27
Shalish study comparing patient comfort of Invisalign, conventional bracketing, and lingual bracketing found which was most uncomfortable, had greatest disfunction and longest recovery?
Lingual braces
28
The Shalish study comparing patient comfort found what findings for pain and recovery with respect to Invisalign?
More pain initially but a shorter / faster recovery
29
The Shalish study comparing pt comfort found what with respect to recovery for conventional brackets?
Did not recover in 2 weeks
30
Does invisalign cause more, less or the same amount of root resorption as conventional ortho?
No proof. Only a case study showing there is resorption.
31
What is the invisalign cost to a practitioner to get certified?
1 day course = $1,995
32
Almost all patients require what with invisalign treatment?
Refinement
33
What is increased and what is decreased with invisalign versus conventional ortho?
Invisalign has higher lab cost, but less chair time than conventional
34
Why does Linduar think ortho will more in the direction of invisalign?
Offers improved oral hygiene