Fixed Appliances in Orthodontics II: Clinical Management

Question 1

Key 1 of ideal occlusion

Answer 1

Molar relations - class I - MB cusp of upper molar sits in buccal groove of lower molar

Question 2

Key 2 of ideal occlusion
For upper right canine
For upper right central incisor

Answer 2

Crown angulation/tipping
11 degrees distally
5 degrees distally

Question 3

Key 3 of ideal occlusion

Answer 3

Crown inclination/torque

Question 4

Key 4 of ideal occlusion

Answer 4

No rotations
Rotated molars take more space
Rotated incisors can take more space

Question 5

Key 5 of ideal occlusion

Answer 5

Tight contacts - no crowding or spacing

Question 6

Key 6 of ideal occlusion

Answer 6

Flat curve of spee

Question 7

Straight wire appliance

Answer 7

Custom for each tooth

Question 8

Main stages of tx and wires used

Answer 8

Levelling and alignment - NiTi
Space closure - SS, powerchain and traction ligatures, NiTi springs
Overjet reduction
Centre line correction

OVERBITE correction
XBITE correction
Finishing and detailing

Question 9

Planes of levelling and alignment

Answer 9

Vertical
BL
MD
Rotational

Question 10

Purpose of canine lace backs

Answer 10

Prevents canine crown moving mesially

Allows posterior teeth to move fwd

Question 11

Unstable result

Answer 11

Perio involved teeth
Diastema
Severe rotations - pericision to reduce chance of relapse

Question 12

Types of retainers

Answer 12

Removable

• acrylic - hawley
• vacuum formed - Essix

Bonded

Question 13

Retention schedule

Answer 13

12hrs/day for first year
Alternate nights for 2nd year
Gradual withdrawal 1 night/week indefinite