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Z-Spring Active Components ‫ بان غانم محمد‬. ‫د‬


Z - Spring

Palato – labial Movement


Components Active Arm

Coil 2-3 mm Retentive Arm (tag)


Properties • Constructed 0.5 mm S.S wire • Width of spring = mesiodistal width of the tooth • Active arm located on the cingulum • Spring covered by thin layer acrylic


Uses 1. Correction of anterior cross bite of single tooth. 2. Correction of rotation of one incisor less than 90째 together with a hawley arch (couple force system)


Couple Force System Rotation < 90 degree


Activation Opening the coil using Angle pliers

25 â&#x20AC;&#x201C; 30 gm 2 - 3 Weeks


PROBLEM 1: UPPER INCISOR INSIDE BITE


RETENTION: Adams cribs 6/6 and 4/4


Active component: Z-spring to 1/


BITE OPENING: Posterior bite capping to 654 / 456 (more comfortable for patient)


BASEPLATE: to connect everything together, also some anchorage


ACTIVATE THE Z-SPRING....


...VOILA!


Alternatives T - Spring


Screw


Modification


Design of Removable Appliance


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