Thumb sucking habit and associated dental differences in one of monozygous twins.
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.
D000293:Adolescent; D002508:Cephalometry; D004200:Diseases in Twins; D005260:Female; D005386:Fingersucking / Q000150:complications / Q000235:genetics*; D006801:Humans; D007568:Jaw / Q000473:pathology; D008310:Malocclusion / Q000209:etiology / Q000235:genetics* / Q000473:pathology; D011247:Pregnancy; D014427:Twins; D014430:Twins, Monozygotic