University of Oulu

Ribeiro, D. C., Dreyer, C. W., Lähdesmäki, R., & Townsend, G. C. (2021). Sexual dimorphism related to occlusal traits in Australian children. In Australasian Orthodontic Journal, 34(1), 36–44.

Sexual dimorphism related to occlusal traits in Australian children

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Author: Ribeiro, Daniela C.1; Dreyer, Craig W.1; Lähdesmäki, Raija2;
Organizations: 1Adelaide Dental School, University of Adelaide, Adelaide, Australia
2Oral Development and Orthodontics, Research Unit of Oral Health Sciences, Medical Faculty, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.1 MB)
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Language: English
Published: Exeley, 2018
Publish Date: 2021-12-08


Background: The aim of the present study was to assess sexual dimorphism related to occlusal variables recorded from dental casts of Australian twins and to compare trends across primary (T1), mixed (T2) and permanent (T3) dentitions in the same individuals.

Methods: The sample comprised 22 males and 25 females selected at random from monozygotic pairs and 19 males and 19 females from dizygotic pairs. Overjet, overbite, midline deviation, midline diastema, primary and permanent molar relationship, and primary and permanent canine relationships were measured in millimetres using a digital calliper.

Results: The mean values for overjet in males in the permanent dentition and for overbite in the mixed and permanent dentitions were significantly greater than those for females. The other occlusal traits showed no sexual dimorphism. Midline diastemata were most prevalent in the primary dentition while coincident midlines were most prevalent at all stages for both genders. In addition, a mesial step deciduous molar relationship was more prevalent on the right side and a flush terminal plane present on the left. Furthermore, a Class II permanent molar relationship was predominant in T1/T2, while a Class I relationship was most prevalent in the permanent dentition. Class II primary and permanent canine relationships were most common at all stages.

Conclusions: Significant sexual dimorphism was found for overjet and overbite at several occlusal developmental stages but sexual dimorphism was not found for the other occlusal traits studied.

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Series: Australasian orthodontic journal
ISSN: 2207-7472
ISSN-E: 2207-7480
ISSN-L: 2207-7472
Volume: 34
Issue: 1
Pages: 36 - 44
DOI: 10.21307/aoj-2020-057
Type of Publication: A1 Journal article – refereed
Field of Science: 313 Dentistry
Funding: This study was supported by the Australian NHMRC Twin Registry, the Australian Multiple Birth Association, Twins Research Australian, Australian Dental Research Foundation, The University of Adelaide – including the Centre for Oro-facial Research and Learning (CORAL), The Australian Society of Orthodontists Foundation for Research and Education, National Health and Medical Research Council (NHMRC) of Australia, the Foundation for Children, Colgate Oral Care Australia, the Financial Markets Foundation for Children, and The European Orthodontic Society.
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