COFFIN SPRING

COFFIN SPRING INDICATIONS
1. upper arch expansion where lateral expansion is indicated. it can be used in cases of unilateral as well as bi lateral crossbites.
2. Antero-posterior expansion required
3. Differential expansion in anterior or posterior region is desired .controlled movement can be obtained.
4. When space requirement is less than 3 mm.
Design Constructed from 1.25mm wire.
Two types can be prepared
i.e. Tear shaped Diamond
• With the help of universal pliers a generous loop in the shape of tear or a diamond shape is prepared. It is kept 1 mm away from the palate.
Tags are prepared at the end of the wire to be embedded in the acrylic.
Four Adams clasps are prepared on the first molars and first molars for retention.
Acrylization can be done with direct method. Originally the base plate was made in one piece and cut with fine saw after vulcanization.
Present day practice is to make the base plate in two small segments, large enough to make contact all the teeth to be moved and contain the tags of the of the clasp and the wire
It should be seated high up on the palatal vault to increase acceptance in patients. Anterior bends may not be incorporated in acrylic to permit full range of action . As an alternate to screws plates it is cheaper and less bulky but unless precise construction and adjustment these may be rather unstable.
Activation Pits are drilled into the base plates allow the initial width of the appliance to be checked with calipers .the spring is expanded anteriorly first, then posteriorly by pulling it apart, care being taken not to twist the appliance. This easier and quicker than adjustment with pliers. An expansion of 2-3 mm will generally be appropriate
APPLIANCES
Open activators of Klammt it is combination of the original activator and bite former. it is particularly important in cases of a narrow maxilla with a distal bite.
Schmuth incorporated a coffin spring in original Balters bionator and was known as functional kybernator it was small and could be worn full time thus all the more effective.

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Where do you got the mould to pour the cast