Finger spring Dr. Ahmed AL-Mayali B.D.S M.Sc. Ortho. iq

Finger spring Active component of R.O.A Palatally situated

  For mesio-distal movement of any tooth  Line of occlusion uses

T YPES Simple finger spring Guarded finger spring

COMPONENT 1-Coil 2-Active arm 3-Tag

Coil  Internal diameter …….3-4 m.m.  Direction………………………………*  Location  Between active arm and tag

Active arm  Coil…………….labial aspect  Non traumatic coil,C-shape  Coil and active arm either open or protected by acrylic  Crank for canine

Tag 1-Simple finger spring ……………zigzag,5-6 m.m., 2 m.m from midline, 1 m.m. from palate 2-Guarded finger spring ………..2 m.m. from coil, with small U loop ( 2mm width & long ), 2m.m. from teeth, end with L-shape, U & L ……….1 m.m. from palate

  Simple  Opening coil 1/3 of tooth ………..2-3 weeks  Guarded  Opening coil ½ of tooth …………..3-4 weeks Activation

Force 0 Parallel to the line of occlusion 0 Put the coil anteriorly 0 Or 0 Put crank

Advantages of Guarded Finger spring  1-Active arm more flexible  2-stable in vertical

Thank you