J. Orthod.
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British Journal of Orthodontics, Vol 11, 195-199, Copyright © 1984 by British Orthodontic Society

ARTICLES

Thumb sucking habit and associated dental differences in one of monozygous twins

DR Willmot

A case report is presented of a set of monozygotic twins aged 14 years, one of whom sucked her thumb and one who did not indulge in the habit. The thumb sucker had a wider lower arch and a narrower upper arch than the non-thumb sucker. The thumb sucker also appeared to have a more forward position of her premaxilla on cephalometric analysis together with an increased overjet. Superimposed outlines of the tongue showed that the thumb sucker was adopting a lower position of the dorsum of the tongue at the time of initial examination.




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Copyright © 1984 British Orthodontic Society.