Z-SpringActive Components

محمد . غانم بان د

Palato – labial Movement

Z - Spring

Components

Active Arm

Coil 2-3 mm

Retentive Arm (tag)

Properties

• Constructed 0.5 mm S.S wire

• Width of spring = mesio-distal width of the tooth

• Active arm located on the cingulum

• Spring covered by thin layer acrylic

Uses1. Correction of anterior

cross bite of single tooth.

2. Correction of rotation of one incisor less than 90° together with a hawley arch (couple force system)

Couple Force SystemRotation < 90 degree

Activation

25 – 30 gm

2 - 3 WeeksOpening the coil using Angle pliers

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