THE THREE ORDER BENDS in STANDARD EDGEWISE TECHNIQUE.pptx

They are made in horizontal plane�It affect expansion or contraction,�Bucco-lingual / Labio-lingual �and rotation movements ���The arch-wire
shaped with first order bends
shouldn’t rise up from the flat
plane at any point.

1.Between upper central and lateral (the arch-wire must have a slight in-set)
2.Between canine and bicuspids (both upper and lower the arch-wire must have slight off-set )
3. Mesial to molars both upper and lower, the arch-wire must have a little more accentuated off-set (bayonet)

Tip bends , Mesio-distal movements.��These bends are made on the vertical plane .
first order bends the arch-wire must be level.
while in second order bends the arch-wire rises from the plane.

It consists from :���A . Loops
B . Anchorage bends
C . Artistic bends
D . Curve of SPEE

LOOPS are the most important second order bends;
They serve to increase elasticity of the wire

�To avoid having a tooth extruded or intruded as compared with the others , it is necessary that the central points of the bent segments lie all on the same plane .
They serve to MESIALLY move the apices of the molars and bicuspids .�� (Intra or Inter-maxillary Traction applied to DISTALIZE the canine or LINGUALLY move the incisors)

1. THE THREE ORDER BENDS in STANDARD EDGEWISE TECHNIQUE (TWEED MERRIFIELD EDGEWISE APPLIANCE) ACHIEVED BY: Dr.Maen Dawodi

2. INSTRUMENTS/ ARMAMENTARIUM TWEED ARCH FORMING PLIER TURRET AND ARCHWIRE

3. INSTRUMENTS/ ARMAMENTARIUM HARD WIRE CUTTER 0r DISTAL ENDCUTTER Hollow chop plier Bired beak plier

4. THREE ORDER OF BENDS 1.THE FIRST ORDER BENDS They are made in horizontal plane It affect expansion or contraction, Bucco -lingual / Labio -lingual and rotation movements The arch-wire shaped with first order bends shouldn’t rise up from the flat plane at any point.

5. FINISHING OF IDEAL ARCH 1.Between upper central and lateral (the arch-wire must have a slight in-set) 2.Between canine and bicuspids (both upper and lower the arch-wire must have slight off-set ) 3. Mesial to molars both upper and lower, the arch-wire must have a little more accentuated off-set (bayonet) (bayonet)

6. 2)SECOND ORDER BENDS Tip bends , Mesio -distal movements. These bends are made on the vertical plane . first order bends the arch-wire must be level. while in second order bends the arch-wire rises from the plane.

7. It consists from : A . Loops B . Anchorage bends C . Artistic bends D . Curve of SPEE

8. A.) Loops LOOPS are the most important second order bends; They serve to increase elasticity of the wire

9. B.) Anchorage Bends (Tip back) To avoid having a tooth extruded or intruded as compared with the others , it is necessary that the central points of the bent segments lie all on the same plane . They serve to MESIALLY move the apices of the molars and bicuspids . ( Intra or Inter-maxillary Traction applied to DISTALIZE the canine or LINGUALLY move the incisors )

10. C.) Artistic bends They are used to slightly move away the apices of the upper front teeth. For this reason at end of the treatment ,Orthodontists apply bends (which they called “Artistic “to make the result more acceptable.

11. In cases starting with very close apices the cases where at the start the apices were wide apart it might be useful to finish with reversed Artistic Bends

12. D.)Curve of SPEE and Counter SPEE These are used for Intruding or extruding the front teeth to reduce the deepbite caused from anterior teeth CURVE OF SPEE (ACCENTUATED) intrudes the upper incisors , extrudes the lower ones. REVERSE CURVE OF SPEE extrudes upper incisors ,intrudes lower ones

13. DEEP BITE = Upper Arch : Curve of SPEE Lower Arch : Reverse Curve SPEE OPEN BITE= Upper Arch : Reverse Curve SPEE Lower Arch: Curve SPEE

14. 3.)THIRD ORDER BENDS They are obtained by twisting the wire its own axis (torque ). they are use to place on the teeth movements in the buccal-lingual direction (give some degree of lingual crown tourqe in mandibular teeth & maxillary posterior teeth and some degree of lingual root torque in maxillary anterior teeth). . To be considered : an Active Torque & Passive torque Positive Torque = lingual root or buccal crown torque Negative Torque= buccal root or lingual crown torque Active Torque : When buccal-lingual movement has to be impressed on a tooth (or on a group of teeth). Passive torque when no movement in buccal-lingual direction has to be impressed on a tooth .The wire should enter the bracket passively without effort.

15. Positive Torque (buccal crown or lingual root torque) The(active) torque intended to LINGUALLY move the root (and the crown LABIALLY) has conventionally been considered positive . Generally the torque is measured in degrees of inclination as compared With the occlusal plane.

16. Negative torque (= lingual crown or buccal root torque) This is the one intended to labial- ly move the root (and lingually the crown) In the same cases the root buccal movement may produce resorption and retraction of the alveolar cortical bone therefore ,the negative torque is to be used very carefully (especially on the upper incisors !)

17. Third order bends in mandibular arch wire: Incisors : -7 Canine & 1 st premolars : -12 2 nd premolaes & molars : -2 Third order bends in maxillary arch wire : Incisors : 0 Canine &1 st premolars : -7 2 nd premolars & molars : -12

18. REFERENCES ATLAS OF ORTHODONTIC APPLIANCES (FIXED&REMOVABLE) by FEDERICO TENTI V. MD,DMD ORTHODONTICS CURRENT PRINCIPLES AND TECHNIQUE 5 th ed. by THOMAS M.GRABER , ROBERT L.VANARSDALL