Prevalence and patterning of maxillary premolar accessory ridges (MxPARs) in several human populations

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dc.contributor.authorMihailidis, S.
dc.contributor.authorScriven, G.
dc.contributor.authorKhamis, M.
dc.contributor.authorTownsend, G.
dc.date.issued2013
dc.description.abstractWe present new data on the prevalence and patterning of the maxillary premolar accessory ridge (MxPAR), a common but understudied morphological dental trait that is expressed as a linear elevation extending from the buccal cusp ridge to the medial sulcus of maxillary premolar teeth. A total of 579 sets of dental casts, representing six ethnic groups, were scored using the five-grade system proposed by Burnett et al. (2010). The frequency and distribution of the MxPAR were determined by tooth type, sex, side, locus and ethnicity, and the applicability of the scoring system was assessed. The MxPAR was found in approximately two-thirds of premolar teeth, more often on second than first premolars, and more often on the distal aspect of the occlusal surface than the mesial. There was some evidence that more pronounced forms of the feature occurred more often in males than females, and that there may be some directionality in its expression between sides. Variation was also noted in the frequency of occurrence and degree of expression of the MxPAR between ethnic groups. Intra- and inter-observer concordance rates for scoring the MxPAR were low, confirming that it was difficult to score the trait identically on two different occasions. Our findings have clarified the distribution of the MxPAR within the dentition and between ethnic groups, and highlighted the need for researchers to carry out thorough replicability studies and to decide on an appropriate breakpoint for determining presence or absence of this feature before embarking on genetic studies or bio-distance analyses.
dc.description.statementofresponsibilitySuzanna Mihailidis, Graham Scriven, Mohd Khamis and Grant Townsend
dc.identifier.citationAmerican Journal of Physical Anthropology, 2013; 152(1):19-30
dc.identifier.doi10.1002/ajpa.22323
dc.identifier.issn0002-9483
dc.identifier.issn1096-8644
dc.identifier.urihttp://hdl.handle.net/2440/80681
dc.language.isoen
dc.publisherWiley-Liss
dc.relation.grantNHMRC
dc.rightsCopyright © 2013 Wiley Periodicals, Inc.
dc.source.urihttps://doi.org/10.1002/ajpa.22323
dc.subjectdental morphology
dc.subjectscoring system
dc.subjectdental anthropology
dc.subjectnonmetric traits
dc.titlePrevalence and patterning of maxillary premolar accessory ridges (MxPARs) in several human populations
dc.typeJournal article
pubs.publication-statusPublished

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