Learn Orthodontics

Quad Helix :band selection and fit

Firstly separate upper molar teeth (as per band fit). Usually the week before band placement,separators are placed in order to move the adjacent teeth slightly apart.

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Leave seperators in place for 7-10days. This creates slight spacing between the teeth making it easier for the operator, and reduces the discomfort to the patient, when fitting bands. Band selection is usually made on a trial-and-error basis. You can get an indication of the correct size by comparing bands of different sizes with the patient's study models.

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Bands are placed over the tooth so that they are a tight fit, band pushers are carefully used to press the band into place. Care is required as it is easy to slip and damage the soft tissues.

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Once bands are selected, take an impression over the bands. Remove impression, remove the bands (replace seperators to maintain the space) and place the bands carefully and securly in the impression. Write up lab sheet prescription and send to lab. Quad Helix construction usually takes between 2-3 weeks.

Once quad helix is back - check it is manufactured for the right patient to your prescription

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Check fit in mouth

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If OK, activate by expanding the Quad Helix by about 1 molar width

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The nurse mixes Glass Ionomer cement and places in the bands. The Glass Ionomer cement is mixed to 'whipped cream' consistency, then loaded from the gingival edge of the band, any excess cement will be pushed incisally so ensuring no voids on fitting.

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Cement Quad Helix in place - place one side first, then compress the Quad Helix and place the other side. Remove any excess Glass Ionomer.

DO NOT allow a rinse or eating for 5-10 minutes as it takes that time for Glass Ionomer to set. Give care instructions

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