Bracket positioning and Progress

Question 1

Palatally displaced U2s

Answer 1

Invert bracket to increase labial root tq

- usu. insufficient cause of more crown than root mvm

Question 2

Missing U2s (canine to substitute)

Answer 2

1) U2 bracket on canine
2) Invert U3 bracket
3) Flipped L5 bracket

Question 3

Missing U2s:

Pros and cons of U2 bracket on canine

Answer 3

PRO: correct Prtq

CONS:

• contour of bracket not compatible
• thickness of U2 bracket -> palatal displacement
• insufficient Prtq due to increased crown-root angle

Question 4

Missing U2s:
Invert U3 bracket on canine
PROS CONS

Answer 4

PRO:

• distal tip remains
• base fit
• similar tip
• +ve torque

Question 5

Missing U2s:
Flipped L5 bracket on canine
PRO CONS

Answer 5

PROS:

• increase Prtq (+17)
• curved base
• adjust bracket position for extra 6 deg drt

CONS
+2 in opposite direction

Question 6

Cl. III camou canines

Answer 6

contra-lateral L3 brackets to encourage distal tipping

- reduce anchorage demand

Question 7

P displaced canine

Answer 7

Invert contralateral L3 bracket to U3
- increase Lartq

NB only for Roth (9 deg diff) not MBT (1 deg diff)

Question 8

Missing U1 (mesialising U2)

Answer 8

contralateral U1 bracket to increase mrt

• mesial surface of crown will be vertical
• allow built up on distal surface for optimal emergence profile