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Type: Conference paper
Title: Patterns of Asymmetry in Primary Tooth Emergence of Australian Twins
Author: Mihailidis, S.
Woodroffe, S.
Hughes, T.
Bockmann, M.
Townsend, G.
Citation: Frontiers of Oral Biology, 2009 / Koppe, T. (ed./s), vol.13, pp.110-115
Publisher: Karger
Publisher Place: Postfach Basel Switzerland CH-4009
Issue Date: 2009
Series/Report no.: Frontiers of Oral Biology
ISBN: 9783805592291
ISSN: 1420-2433
Conference Name: International Symposium on Dental Morphology (27 Aug 2008 - 30 Aug 2008 : Perth)
Editor: Koppe, T.
Statement of
Mihailidis S, Woodroffe SN, Hughes TE, Bockmann MR and Townsend GC
Abstract: Aims: 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.
Keywords: Tooth, Deciduous
Statistics, Nonparametric
Sex Factors
Twins, Dizygotic
Twins, Monozygotic
Tooth Eruption
Time Factors
Functional Laterality
Description: © 2009 S. Karger AG, Basel
DOI: 10.1159/000242401
Appears in Collections:Aurora harvest
Dentistry publications

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