Patterns of Asymmetry in Primary Tooth Emergence of Australian Twins

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dc.contributor.authorMihailidis, S.
dc.contributor.authorWoodroffe, S.
dc.contributor.authorHughes, T.
dc.contributor.authorBockmann, M.
dc.contributor.authorTownsend, G.
dc.contributor.conferenceInternational Symposium on Dental Morphology (27 Aug 2008 - 30 Aug 2008 : Perth)
dc.contributor.editorKoppe, T.
dc.date.issued2009
dc.description© 2009 S. Karger AG, Basel
dc.description.abstractAims: This study is part of a larger investigation of genetic and environmental influences on primary tooth emergence in Australian twins. Our aims were to describe patterns of emergence asymmetry, including directional and fluctuating components (DA, FA), and to test for a genetic basis to observed asymmetry. Methods: The study sample consisted of 131 twin pairs. Using one randomly-selected twin from each pair, dental asymmetry was examined by analysing the number of days between emergence of an-timeres (Δ), with dates of emergence provided through parental recording. Scatterplots were used for assessment of DA and FA, followed by paired t-tests to detect significant differences in mean Δ from zero (evidence of DA). FA was assessed by calculating means and variances of the absolute value of Δ. A range of intervals (0, 7, 14, 21, 28 days) was used to define symmetrical emergence of antimeres. Results: Although a trend in left-side advancement for tooth emergence was detected, this was not statistically significant. Relatively low levels of FA were noted through -out the primary dentition, with maxillary and mandibular lateral inisors displaying the highest values, but no evidence of a genetic influence on FA was noted. Around 50% of all antimeric pairs of primary teeth were found to emerge within 14 days of each other, although time differences of more than 50 days were noted in some cases. Conclusion: Studies of dental asymmetry provide insights into the biolo gical basis of lateralisation in humans and the results can also assist clinicians to discriminate between normal and abnormal developmental patterns.
dc.description.statementofresponsibilityMihailidis S, Woodroffe SN, Hughes TE, Bockmann MR and Townsend GC
dc.identifier.citationFrontiers of Oral Biology, 2009 / Koppe, T. (ed./s), vol.13, pp.110-115
dc.identifier.doi10.1159/000242401
dc.identifier.isbn978-3-8055-9229-1
dc.identifier.issn1420-2433
dc.identifier.issn1662-3770
dc.identifier.orcidHughes, T. [0000-0001-8668-7744]
dc.identifier.orcidBockmann, M. [0000-0001-8050-0993]
dc.identifier.urihttp://hdl.handle.net/2440/57618
dc.language.isoen
dc.publisherKarger
dc.publisher.placePostfach Basel Switzerland CH-4009
dc.relation.ispartofseriesFrontiers of Oral Biology
dc.source.urihttps://doi.org/10.1159/000242401
dc.subjectTooth, Deciduous
dc.subjectHumans
dc.subjectStatistics, Nonparametric
dc.subjectEnvironment
dc.subjectSex Factors
dc.subjectOdontogenesis
dc.subjectTwins, Dizygotic
dc.subjectTwins, Monozygotic
dc.subjectTooth Eruption
dc.subjectTime Factors
dc.subjectInfant
dc.subjectFemale
dc.subjectMale
dc.subjectFunctional Laterality
dc.titlePatterns of Asymmetry in Primary Tooth Emergence of Australian Twins
dc.typeConference paper
pubs.publication-statusPublished

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