Ortho Lab 3

Question 1

Please construct a URA to reduce OJ 21,22,11,12 and reduce OB

Answer 1

Active component - 22,21,11,12 Roberts retractor - 0.5mm HSSW and 0.5 I.D tubing (move anterior teeth back)

• *Stops - use these to stop the canines relapsing and moving back to original position
  - 13 and 23 mesial stops 0.7mm (flattened) HSSW - passive component

Retentive - 16, 26 Adams Clasp 0.7mm HSSW - no additional anterior retention as using Robert’s Retractor

Anchorage - moving 4 teeth - alright as because they are short rooted teeth so easier to move than other teeth - unlikely to be compromised

Baseplate - self cure PMMA and FABP - OJ + 3mm - needs to be trimmed on monthly basis on palatal aspect of the tooth, follow the contour of tooth and it gives it room to allow the tooth to come back

**Don’t use PBP - as posterior not in contact and pings the upper incisors forward by the lower incisors

Question 2

Adams Clasp - arrowhead?

Answer 2

This is the retentive part that engages into the undercut

Question 3

Adams clasp - bridge?

Answer 3

Helps keep cheek away from the component

Gives patient an area to grip onto when removing

Question 4

Adams Clasp - flyover?

Answer 4

Needs to be flush with interdental area

Question 5

Adams clasp - leg?

Answer 5

Goes into palatal aspect - sit 0.5mm off soft tissue to get acrylic underneath so that it is flush

Question 6

Adams clasp - Tag?

Answer 6

Acts as a hook to hold in position - mechanical retention

Question 7

Finger spring - tag?

Answer 7

Encompassed in acrylic

Question 8

Finger spring - Coil?

Answer 8

where forces are exerted from

Question 9

Finger spring - active arm?

Answer 9

Applies force to tooth

Question 10

Finger spring - guard wire?

Answer 10

Acts as a guide and allows finger spring to move across palate without causing harm or trauma to patient