Primary tooth size asymmetry in twins and singletons

Orthodontics & Craniofacial Research
T HeikkinenL Alvesalo

Abstract

To explore asymmetry values of antimeric deciduous tooth crown dimensions in three types of twins: monozygotic (MZ), dizygotic same-sex (DZ) and opposite-sex (OS) vs. single-born controls. Mesiodistal and labio-lingual crown dimensions of second deciduous molars and mesiodistal canine and first molar crown dimensions of 2159 children at 6-12 years of age were evaluated, originating from the US cross-sectional Collaborative Perinatal Study from the 1970s, including altogether MZ (n = 28), DZ same-sex (n = 33) and OS (n = 39) pairs. Single born (n = 1959) were used as controls. Dental casts were measured for comparison of variance relationships calculated from antimeric teeth, exhibiting fluctuating (FA), and directional (DA) asymmetry using anova. Significant differences appeared in MZ and OS girls in DA of deciduous canines, which gain size in the first and second trimester, and deciduous second molars, which finally stop crown growth during the early post-natal period. Significantly, increased FA values appeared for lower deciduous canines and second molars, indicating greatest environmental stress in OS girls, MZ girls and DZ boys. Twin girls had more fluctuating and directional crown asymmetry than twin boys, but in some dim...Continue Reading

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Citations

Apr 12, 2017·American Journal of Human Biology : the Official Journal of the Human Biology Council·Philippe P HujoelA-M Bollen
Jul 10, 2018·European Journal of Orthodontics·Kirsi PihlajaTuomo Heikkinen
Jun 12, 2019·Orthodontics & Craniofacial Research·Roberto RongoRoberto Martina
Feb 20, 2020·American Journal of Physical Anthropology·Kathleen S PaulGrant C Townsend
Oct 8, 2021·Acta Odontologica Scandinavica·Elina V HeikkinenTuomo Heikkinen

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