Quad helix is used in correction of dental cross bites and its in transverse dimension.
If it's dental crossbite yes quad helix works.
If its skeletal crossbite it will worsen the end result stability and periodontal health etc.
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it will help in facial profile improvement but in indirect way as its just corrects the dental crossbite. So it will have minimal effect on profile.
Answered2017-11-17 06:17:50
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