Short answer: A quad helix is an appliance made of a flexible wire with four helical coils, attached to bands cemented to the upper molars. It widens the upper dental arch slowly and in a controlled way; it is mostly used in children to correct a crossbite of the back teeth and is adjusted by the orthodontist.
How does it differ from a palatal expansion screw?
- Quad helix: Expands slowly using the force of the flexible wire; parents do not need to turn a screw.
- Screw expander: Turning the screw gives faster, mainly skeletal expansion.
For the screw option, see our article on the palatal expander.
When is it preferred?
- Crossbite of the back teeth on one or both sides
- Upper molars that are rotated inwards
- A narrowed upper arch together with a thumb-sucking habit
For general information on crossbite, take a look at our page on crossbite treatment.
How is it fitted and adjusted?
- Suitable bands are selected for the upper molars.
- The appliance is pre-activated and cemented together with the bands.
- At check-ups the wire is reactivated inside or outside the mouth.
In daily life
- In the first days speech may be affected while the tongue gets used to the wire on the palate.
- Food can collect between the wire and the palate; the mouth should be rinsed with water.
- Chewing gum, toffee and hard foods can loosen the appliance.
Frequently asked questions
How long is a quad helix worn?
After expansion is complete, it is left in place for a while longer to maintain the result; the total time is a few months.
Does a quad helix hurt?
Pressure may be felt for a few days after it is fitted and adjusted.
Can a quad helix be taken out?
No, it is a fixed appliance; it is removed only by the orthodontist.
Which appliance is right for you?
Which appliance is needed is decided after age, growth stage and the condition of the teeth and jaws have been assessed by examination and X-rays. At our clinic in Oran, Çankaya, Ankara, we discuss the options with you during the first orthodontic examination. To see all types of appliance in one place, take a look at our guide to orthodontic appliances.
