Edgewise appliance

1. Edgewise appliance

2. I t refers to the method by which a rectangular archwire is inserted into the bracket on the edge. It was discovered in 1925 by Dr.Edward H. Angle . The wire is inserted into the bracket with the narrow diamention placed occluso-gingivally . This mode of insertion of the wire is callled edgewise and therefore the techniqe was called edgewise technique. Uses : Control of tooth movement Gaining space I ntroduction

3. Bracket slot-0.022 ″×0.028″ with single or double tie-wings. Slot projects horizontally from the base of the bracket. Bonded and welded brackets are available. Bracket specification

4. Maxillary central incisor:3.5mm from the incisal edge to the bracket base Maxillary lateral incisor:3mm from the incisal edge to the bracket base Maxillary cuspids:4.5mm from the incisal edge to the bracket base Maxillary bicuspids:3.5mm from the buccal cusp tip to the bracket base Maxillary molars:middle third of the crown Position

5. Mandibular incisors:2.5mm from the incisal edge to the bracket base Mandibular cuspids:3.5mm from the incisal edge to the bracket base Mandibular bicuspids:3mm from the buccal cusp tip to the bracket base Mandibular molars:middle third of the crown All brackets were centered mesiodistally on buccal surfaces of the teeth.

6. 1 st step :its made in the horizontal plane of labial and buccal contour of teeth. 2 nd step :made in vertical plane Uses : mesial distal inclination uprightening of teeth elevation and depressing of teeth Anchorage preparation paralleing of roots of certain teeth Archwire fabrication

7. 3 rd step :bends used to the tip of the crowns or roots labially or lingually or buccally placed by twisting the archwire

8. Diameter of the wire:0.012″×0.020″or 0.016″×0.016″to 0.018″×0.018″ square wings Levelling of maxillary and mandibular arches

9. maxillary and mandibular cuspid retraction using open coil springs loops headgears to augment anchorage For mandibular incisors:0.019″×0.026″ archwire with closing loop Space closure

10. Using tip back bands in the buccal segment on a 0.019″×0.026″ archwire Mandibular anchorage

11. bodily rectraction with special helical closing loops in 0.0215″×0.0285″ archwire Maxillary anterior rectraction :

12. Move teeth in all 3 planes Good control over tooth movement Precise finishing is possible Bodily tooth movement is possible Advantages

13. Forces were used heavy so the incidence of patient discomfort and root resorption Complex wire bending Difficulty to open deep bite Increase friction between archwire and the bracket Drawbacks