1. Dr. Ahmed AL-Mayali B.D.S M.Sc. Orth. ahmed.almayali@uokufa.edu.iq
General principle
Dr. Ahmed AL-Mayali
B.D.S M.Sc. Orth.

2. Types of orthodontic appliance
1-Removable appliance 2-Fixed appliance 3-Myofunctional appliance 4-Combination between Removable and Fixed appliance

3. Removable orthodontic appliance
Active component
Retentive component
Acrylic base plate
Anchorage

4. Material in orthodontic appliance
Pliers
cutter
stainless steel wire
acrylic

5. Types of pliers
Angle plier
Adam plier

6. Properties of plier short blade Large comfortable handle
Taper of blade
Sharp edges of beaks
No roughness
Not rusted

7. stainless steel wire 18-8 s.s wire 1-Classification soft Hard
Extra hard

8. 2-Advantage Does not harm the mouth Does not tarnish
Supplied hard or soft
Annealed
Welded
Soldered
Once adjusted maintain its displacement
Economical

9. 3-Physical properties
Fatique
Deflection
Flexibility
Rigidity

10. 4-Mechanical properties of S.S. wire
F= D *R4/L3
F force
D deflection
R diameter of wire
L length of wire

11. Tooth movement by removable appliance
Tipping
Rotation less than 90

12. Orthodontic force
Light
Intermittent
Pressure g/cm2

13. Types of wire bend
Soft curve
Right angle bend
Acute bend

14. Art principle of wire bend
Sitting position
Cutting the wire
Wire straight
Non traumatic end
Plier gripping
Area of contact × point of contact
Firm wire gripping
Clean left hand
Marker pen
Avoid notching
Avoid repetition
Don’t go back
Imagination
Follow the anatomy
Parallel to the gum, …….