SLB

Question 1

Describe

Answer 1

Have built-in ligating mechanism that can be active or passive

Question 2

Difference between active and passive

Answer 2

Passive: Locking mechanics is a sliding door that does not encroach into bracket slot dimensions

Active: Locking mechanics is an active “spring clip” that encroaches into slot space from buccal, esp. with large size archwire
- theorectically providing seating force onto archwire into bracket slot base, increasing torque expression of bracket prescription

Question 3

Effectiveness of active v passive

Answer 3

Active align 10days after but no diff in overall tx time (Maizeray et al., 2021)

No sig. diff in torque expression -> arch wire-bracket more impt than type of ligation (Franco et al., 2015)

Question 4

Benefits

Answer 4

• Reduce friction
• Faster archwire change
• Increase Pt comfort and hygiene
• Reduce exo due to arch expansion
• Faster tx
• Less appt

Question 5

Evidence for saving of chairside time

Answer 5

Chen et al., 2010
Save 20sec/ arch opening

Maizeray, 2021 YES

Question 6

Evidence for pt comfort

Answer 6

More painful to insert 19x25ss - “all or nothing”

McLaughlin & Bennett, 2015

Question 7

Evidence for tx time

Answer 7

NO diff (Maizeray et al, 2021)

Adv. from bracket type dwarf by extraneous factors (Fleming, 2013)

Damon breached UK ad codes for misleading claims (ASA, 2017)

Question 8

Evidence for arch expansion

Answer 8

NO difference in intermolar width (Chen et al., 2010)

• increase molar buccal crown tip due to less buccal root torque (Aik & Ciger, 2014)
• broader arch forms

Question 9

Weakness

Answer 9

Torque expression

Cost

Question 10

Evidence re torque expression

Answer 10

Pandis et al., 2016 - No diff
Chen et al., 2010 - Similar or less

Al-thomali, 2017
- conventional more torque exp/ less loss
due to increase raw material modulus of elasticity
- increase slot wall thickness