SlideShare a Scribd company logo
3.5mm
7.5mm
Closing loop
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
M/F
• Lower Moment/force inadequate root control
M/F
M/F
M/F
M/F
• To prevent side-effect of deep bite
1. Gable bending 20-30 degree
2. Or mini screw to prevent deep bite
3. Or High pull headgear J-hook to make bodily movement
• To prevent side-effect of deep bite
1. Gable bending 20-30 degree
2. Or mini screw to prevent deep bite
3. Or High pull headgear J-hook to make bodily movement
M/F
M/F
• Horizontal force (HF) and load/deflection ratio (L/D)
produce strongly influenced by the metal alloy stainless
steel than beta titanium.
• Optimal force and an M/F ratio for the retraction of anterior
teeth, and is applicable in a 0.022-in slot system.
• M/F ratio of 9.3
• Inadequate root control
• Vertical force could lead to deep overbite relationship
• If closing loop is placed off-center between center and
posterior, short section create moment, encouraging
root tipping. Longer section smaller moment encourage
translation.
• The beta-titanium loops produced lower amounts of
horizontal force and load/deflection ratio than the stainless
steel loops.
• The stainless steel loops generated high load/deflection
proportions, and consequently provided higher levels of
horizontal force during their deactivation.
• We should consider for alternative treatment
M/F
M/F

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Closing loop

  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 15.
  • 16.
  • 17.
  • 18.
  • 22. • Lower Moment/force inadequate root control M/F M/F
  • 23. M/F M/F • To prevent side-effect of deep bite 1. Gable bending 20-30 degree 2. Or mini screw to prevent deep bite 3. Or High pull headgear J-hook to make bodily movement
  • 24. • To prevent side-effect of deep bite 1. Gable bending 20-30 degree 2. Or mini screw to prevent deep bite 3. Or High pull headgear J-hook to make bodily movement M/F M/F
  • 25. • Horizontal force (HF) and load/deflection ratio (L/D) produce strongly influenced by the metal alloy stainless steel than beta titanium. • Optimal force and an M/F ratio for the retraction of anterior teeth, and is applicable in a 0.022-in slot system. • M/F ratio of 9.3 • Inadequate root control • Vertical force could lead to deep overbite relationship • If closing loop is placed off-center between center and posterior, short section create moment, encouraging root tipping. Longer section smaller moment encourage translation. • The beta-titanium loops produced lower amounts of horizontal force and load/deflection ratio than the stainless steel loops. • The stainless steel loops generated high load/deflection proportions, and consequently provided higher levels of horizontal force during their deactivation. • We should consider for alternative treatment M/F M/F