Prescription

Question 1

U1 torque and tip in Andrews/Roth/MBT

Answer 1

Torque: 7 (Andrews), 12 (Roth), 17 (MBT)
- add 5 degrees each from Andrews

Tip: 5 (A/R), 4 (MBT)

• MBT reduce tip to reduce anchorage demand
• Tip not an issue, large area to apply control
• reduce black triangles between U1s

Question 2

U2 torque and tip in Andrews/Roth/MBT

Answer 2

Torque: 3 (Andrews), 8 (Roth), 10 (MBT)
- Roth add 5 degrees each from Andrews, MBT add 7

Tip: 9 (A/R), 8 (MBT)

Question 3

U3 torque and tip in Andrews/Roth/MBT

Answer 3

Torque: -7 (Andrews), -2 (Roth), -7 or 0 (MBT)

Tip: 11 (A) 13 (R), 11 (MBT)
- Roth 2deg more distal root tip for retraction and canine guidance

Question 4

U premolars torque and tip in Andrews/Roth/MBT

Answer 4

U4=U5
MBT=Roth
Andrew=Roth torque: 7
Tip: 0 (Roth) 2 (Andrews)

Question 5

U molars torque and tip in Andrews/Roth/MBT

Answer 5

U6=U7
MBT=Roth
Torque: -9 (Andrews) - 14 (Roth)
Tip: 0 (Roth) 5 (Andrews)

Question 6

L incisors torque and tip in Andrews/Roth/MBT

Answer 6

Andrews= Roth
Torque -1
Tip +2 (MBT also)

MBT: Torque +2

Question 7

L canine torque and tip in Andrews/Roth/MBT

Answer 7

Torque: -11 (Andrew/Roth), -6 (MBT)
Tip: +2 (Andrew) +3(MBT) +7 (Roth)

MBT:
Need for more uprighting (labial root torque)of the lower incisors (-6 degree) because they tend to procline
forward during leveling of COS and when eliminating lower incisor crowding

Can use 0 or +6 torque to prevent dumping in of teeth during SC

Question 8

L premolars torque and tip in Andrews/Roth/MBT

Answer 8

Torque Andrews=Roth
L4: -17, -12 (MBT)
L5: -22, -17 (MBT)

Tip L4=L5
Andrew=MBT
2(Andrews/MBT) -1 (Roth)

Question 9

L molars torque and tip in Andrews/Roth/MBT

Answer 9

Torque:
L6: -20 (MBT) -30 (Andrews)
L7: 10 (MBT) 33 (Andrews)

Tip: 2 (Andrews) 0 (MBT)

20 degree torque recommended for lower 1st nd 2nd molars to produce an uprighting effect on molars which are tipped lingually