Space Analysis And Extraction Need Flashcards
1
Q
How can you work space out?
A
- Visualisation
- Brass wire technique
- Relfex microscope
- Scanning program
2
Q
Visualisation
A
- Count up overlap of each tooth (minus any area of spacing e.g. between lower 1s.
- Very unreliable and most common method used.
- It’s overestimate crowding
3
Q
Brass wire technique
A
- Cut piece of brass wire to best fit arch form from distal of 6’s.
- Add up mediocre- distal widths of each tooth from 6-6 with caliper.
- Take the sum widths away from length of a brass wire to give you how many mm crowding there is.
- Best to carried out on study model
- Time consuming
- Underestimate crowding
4
Q
Relfex microscop
A
- A computer program linked to microscope accurately estimates crowding
- Very accurate
- Expensive equipment
- Time consuming
- Not practical in real world
5
Q
Scanning programmes
A
- Rapidly growing area of dentistry
- Improving in accuracy speed and cost.
- Linked with computer programmes which can estimate amount of crowding
6
Q
Which one is best technique to measure crowding?
A
- Brass wire
7
Q
Scale of crowding
A
- Mild - 0-4
- Mod 4-8
- Sever more than 8
8
Q
Royal London space planning ?
Space requirements implication
A
- Crowding / spacing
- Levelling curve of spee
- Arch expansion
- Incisor A-P position
- Angulation of teeth
- Inclination of teeth
Once you add up space requirement and space creation the total should be zero
9
Q
Royal London space analysis conclusion
A
- Very rigid and formal way
- time consuming
- most orthodontist learn to this in their head with experiences
10
Q
When do we extract 4s not 5s ?
A
- More crowding 4s
- Less crowding 5s
11
Q
When do we extract 5s ?
A
- Lower in Proclined after tb phase because they don’t want to Retroclined incisor again
- less crowding case
12
Q
Methods of orthodontic space creation
A
- Tooth extraction
- Expansion
- Distal movement e.g using HD or TAD’s
- IPR (interproximal enamel reduction)
13
Q
Angles 1910,
A
- Believed 32 teeth would provide functional and best aesthetic that’s why believed in expansion
- Strongly criticised angles’s non xtn because Aesthetic effect - excess facial protrusion following extreme expansion
14
Q
1940’s Tweed and begg
A
Tweed - Disappointed with relapse - Hence retreated 100 pt with Xtn upper 4s
- Observed occlusion was more settle
Begg- also abandoned a non Xtn policy due to of relapse
15
Q
Why we need extraction teeth?
A
- Relief crowding
- OJ and OB Reduction
- Anchorage considerations
- buccal segment relationship correction
- To correct incisor relationship in CLASS III - lower incisor retroclination to correct CL III relationship
