Ortho Appliances

Question 1

retracting canines ura

Answer 1

AIM
please construct a ura to retract 13+23

A = 3/3 palatal finger springs + guards 0.5mm HSSW
R = 6/6 Adams 0.7mm
1/1 Southend 0.7mm
A =
B = self-cure PMMA

Question 2

retract buccally placed canines

Answer 2

AIM
please construct ura to retract buccally placed canines

A = 3/3 buccal canine retractors 0.5mm HSSW + 0.5mm ID tubing
R = 6/6 Adams 0.7mm
1/1 Southend 0.7mm
A =
B = self-cure PMMA

Question 3

anterior crossbite 12

Answer 3

AIM
please construct ura to correct anterior crossbite on 12

A = 12 z spring 0.5mm HSSW
R = 6/6 Adams 0.7
4/4 Adams 0.7
A =
B = self-cure PMMA, PBP

Question 4

expand upper arch

Answer 4

AIM
please construct ura to expand upper arch

A = midline palatal scre
R = 6/6 Adams 0.7
4/4 Adams 0.7
A =
B = self-cure PMMA, PBP

Question 5

reduce overjet and overbite

Answer 5

AIM
please construct a ura to reduce overjet on 22, 21, 11, 12 and reduce overbite

A = 22, 21, 11, 12 Roberts retractor 0.5mm HSSW + 0.5mm ID tubing
3/3 mesial stops 0.7mm HSSW [flattened]
R = 6/6 Adams
A =
B = self-cure PMMA, FABP +3mm

Question 6

fitting URA 10 steps

Answer 6

1. right appliance right patient
2. check appliance matches design sheet
3. inspect and run finger over all surfaces to check for traumatic/sharp areas
4. check integrity of wirework
5. insert into pt mouth, look for areas of blanching or soft tissue trauma
6. check posterior retention [flyover, arrowhead]
7. check anterior retention
8. activate appliance
9. demonstrate correct removal/insertion and they can do it to
10. book appt in 4-6 weeks

Question 7

pt information and instruction 10 steps

Answer 7

1. will feel big and bulky
2. initial excessive salivation that will pas in 24hrs
3. may impinge on speech, read out loud to subside
4. initial discomfort and ache, indicate its working
5. worn 24/7 including meal times and sleep
6. remove after every meals and clean with soft brush
7. remove and store in protective container when contact/active sports
8. avoid hard/sticky foods which may damage, caution with hot food/drinks
9. missing appt and non compliance will lengthen tx time
10. provide emergency contact details in case of any problems

Question 8

adv of removable

Answer 8

tipping of teeth
excellent anchorage
cheaper than fixed
shorter chairside time
OH easier
non destructive to tooth surface
less specialised training
adapted easily for overbite reduction
block movements

Question 9

disadv of removable

Answer 9

less precise control of tooth movement
easily removed by pt
only 1-2 teeth moved at a time
specialist staff construct it
rotations difficult to correct

Question 10

components of stainless steel

Answer 10

iron 72
chromium 18
nickel 8
titanium 1.7
carbon 0.3

Question 11

active component

Answer 11

name of component(s) which will be moving teeth with application of force

Question 12

retention

Answer 12

resistant to displacement forces

Question 13

anchorage

Answer 13

resistance to unwanted tooth movement

Question 14

baseplate

Answer 14

connects all components as a unit, provides anchorage and assists with retention