The rectangular wire used in edgewise appliance | Crack AIPGDEE

The rectangular wire used in edgewise appliance in primarily meant for:

A. Correction of crown root position

B. Increasing the strength of wire

C. Correction of Arch-length Deficiency

D. Used for correction of anterior crowding

Ans. (A) Correction of crown root position: 

Edgewise : “To overcome the deficiencies of the ribbon arch, Angle reoriented the slot from vertical to horizontal and inserted a rectangular wire rotated 90 degrees to the orientation it had withthe ribbon arch-thus the name “edgewise”. The dimensions of the slot were altered to 22 X 28 mils, and a 22 X 28 precious metal wire was used. These dimensions were arrived at after extensive experimentation and allowed excellent control of crown and root position in all three planes of space.