Journal article
Functional and Morphological Correlates of Mandibular Symphyseal Form in a Living Human Sample
American journal of physical anthropology, Vol.153(3), pp.387-396
03/01/2014
DOI: 10.1002/ajpa.22437
PMID: 24264260
Abstract
Variation in recent human mandibular form is often thought to reflect differences in masticatory behavior associated with variation in food preparation and subsistence strategies. Nevertheless, while mandibular variation in some human comparisons appear to reflect differences in functional loading, other comparisons indicate that this relationship is not universal. This suggests that morphological variation in the mandible is influenced by other factors that may obscure the effects of loading on mandibular form. It is likely that highly strained mandibular regions, including the corpus, are influenced by well-established patterns of lower facial skeletal integration. As such, it is unclear to what degree mandibular form reflects localized stresses incurred during mastication vs. a larger set of correlated features that may influence bone distribution patterns. In this study, we examine the relationship between mandibular symphyseal bone distribution (i.e., second moments of area, cortical bone area) and masticatory force production (i.e., in vivo maximal bite force magnitude and estimated symphyseal bending forces) along with lower facial shape variation in a sample of n=20 living human male subjects. Our results indicate that while some aspects of symphyseal form (e.g., wishboning resistance) are significantly correlated with estimates of symphyseal bending force magnitude, others (i.e., vertical bending resistance) are more closely tied to variation in lower facial shape. This suggests that while the symphysis reflects variation in some variables related to functional loading, the complex and multifactorial influences on symphyseal form underscores the importance of exercising caution when inferring function from the mandible especially in narrow taxonomic comparisons. Am J Phys Anthropol 153:387-396, 2014. (c) 2013 Wiley Periodicals, Inc.
Details
- Title: Subtitle
- Functional and Morphological Correlates of Mandibular Symphyseal Form in a Living Human Sample
- Creators
- Nathan E. Holton - University of IowaRobert G. Franciscus - University of IowaMatthew J. Ravosa - University of Notre DameThomas E. Southard - University of Iowa
- Resource Type
- Journal article
- Publication Details
- American journal of physical anthropology, Vol.153(3), pp.387-396
- DOI
- 10.1002/ajpa.22437
- PMID
- 24264260
- NLM abbreviation
- Am J Phys Anthropol
- ISSN
- 0002-9483
- eISSN
- 1096-8644
- Publisher
- Wiley
- Number of pages
- 10
- Grant note
- BCS-0550036 / National Science Foundation; National Science Foundation (NSF)
- Language
- English
- Date published
- 03/01/2014
- Academic Unit
- Orthodontics; Anthropology; Anatomy and Cell Biology; Craniofacial Anomalies Research Center
- Record Identifier
- 9984271554302771
Metrics
20 Record Views