Anomalies are removed from the palatal / lingual surfaces of the teeth using an Ash 5 / 9 or similar.
A mid-line screw is also to be used on this upper removable orthodontic appliance and its outline is marked on the model prior to fabricating the palatal finger spring. This enables the technician to position the spring correctly without interfering with the mid-line screw.
The position of the coil and guide arm may also be marked on the model.
Guide arm fabricated in 0.5.mm S.S wire and waxed into position. Remember to leave the tag arms free that are going to be retained in the acrylic.
'Flat Round' pliers are used to fabricate the palatal finger spring in 0.5mm S.S wire.
A coil is fabricated with an approximate 3mm internal diameter.
The coil should unwind in the direction of the tooth and be tightly wound.
N.B. There are many discussions regarding the requirement of the 'active arm' arising from the underside or the upper-side of the coil. Fabricate to the clinicians preference.
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A tag arm is then fabricated as shown, remembering to leave 1mm space between the model / soft tissues and the wire and so it isn't interfering with the mid-line screw. The active arm is also bent over the interstitial area and towards the canine.
Also, the coil should be positioned so it isn't hindered by the guide wire during the later stages of canine retraction. Eg. Don't position the coil too close to the guide arm.
The active arm should follow the contour of the canine and may be 'finished' by smoothing the end of the wire with a rubber bur and turning the wire back on itself.
The palatal finger spring is now waxed / boxed out as shown and smoothed with a flame gun or similar.
The Adams clasps are now fabricated as shown in 0.7mm S.S wire. Note position of Adams clasps tag arms won't interfere with the mid-line screw to be positioned later.
A Buccal guide arm is now fabricated in 0.8mm S.S wire as shown. Ensure the 'U' loop is clear of the Adams clasp arrow head and there is sufficient space for adjustment / retraction.
A pencil line may be marked on the model as a guide to the height of the flat anterior bite plane as prescribed by the clinician.
The Mid-line screw is now positioned as shown and the model 'waxed out' prior to soaking for 10 minutes, spraying with cold cure acrylic and cured to the manufacturers instructions.
The finished orthodontic appliance.
Components shown: -
Double Adams clasp 65 / -. Single Adams clasps - / 46. All Adams clasps fabricated in 0.7mm S.S wire.
Mid-line screw.
Guide wire in o.5mm S.S wire.
Palatal finger spring in 0.5mm S.S wire.
Buccal Guide Arm in 0.8mm S.S wire.
