A comparison of the jaw mechanics in hadrosaurid and ceratopsid dinosaurs using finite element analysis

Phil R. Bell, Eric Snively, Lara Shychoski

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Hadrosaurid and ceratopsid dentaries display traits that suggest divergent functions toward broadly similar diets of fibrous plants. Computed tomographic scans of dentaries of a lambeosaurine and a centrosaurine (Centrosaurus aptertus) were used to compare feeding function of these animals using finite element analysis (FEA). In the hadrosaur, mediolateral expansion of the dentary and elongation of the coronoid process of the surangular were optimally developed to withstand torsion associated with transverse-isognathous jaw occlusion. FEA results strongly suggest longitudinal rotation of the hadrosaurid mandible. Mediolaterally compressed mandibles and FEA stress for the ceratopsid are in compliance with purely isognathous jaw adduction, although palinal retraction during the powerstroke cannot be ruled out. The ceratopsid dentary is further reinforced by a longitudinal ridge on the lateral surface of that element. Surface texture indicating Sharpey's fibers within the ceratopsid coronoid process suggests greater bite force than in lambeosaurines. These findings corroborate previous interpretations and suggest complementary or alternative kinematics to maxillary pleurokinesis in hadrosaurs.

Original languageEnglish
Pages (from-to)1338-1351
Number of pages14
JournalAnatomical Record
Volume292
Issue number9
DOIs
StatePublished - 1 Sep 2009
Externally publishedYes

Fingerprint

Dinosaurs
Finite Element Analysis
finite element analysis
dinosaur
Jaw
Mechanics
jaws
mechanics
mandible (bone)
Mandible
stress analysis
torsion
Bite Force
compliance
kinematics
texture
diet
Biomechanical Phenomena
animal
dietary fiber

Keywords

  • Dentary
  • Dinosaurs
  • Functional morphology
  • Hadrosaurid

Cite this

@article{7cedf51f17be4f52a769bc7b2698c6da,
title = "A comparison of the jaw mechanics in hadrosaurid and ceratopsid dinosaurs using finite element analysis",
abstract = "Hadrosaurid and ceratopsid dentaries display traits that suggest divergent functions toward broadly similar diets of fibrous plants. Computed tomographic scans of dentaries of a lambeosaurine and a centrosaurine (Centrosaurus aptertus) were used to compare feeding function of these animals using finite element analysis (FEA). In the hadrosaur, mediolateral expansion of the dentary and elongation of the coronoid process of the surangular were optimally developed to withstand torsion associated with transverse-isognathous jaw occlusion. FEA results strongly suggest longitudinal rotation of the hadrosaurid mandible. Mediolaterally compressed mandibles and FEA stress for the ceratopsid are in compliance with purely isognathous jaw adduction, although palinal retraction during the powerstroke cannot be ruled out. The ceratopsid dentary is further reinforced by a longitudinal ridge on the lateral surface of that element. Surface texture indicating Sharpey's fibers within the ceratopsid coronoid process suggests greater bite force than in lambeosaurines. These findings corroborate previous interpretations and suggest complementary or alternative kinematics to maxillary pleurokinesis in hadrosaurs.",
keywords = "Dentary, Dinosaurs, Functional morphology, Hadrosaurid",
author = "Bell, {Phil R.} and Eric Snively and Lara Shychoski",
year = "2009",
month = "9",
day = "1",
doi = "10.1002/ar.20978",
language = "English",
volume = "292",
pages = "1338--1351",
journal = "Anatomical Record",
issn = "1932-8486",
publisher = "John Wiley and Sons Inc.",
number = "9",

}

A comparison of the jaw mechanics in hadrosaurid and ceratopsid dinosaurs using finite element analysis. / Bell, Phil R.; Snively, Eric; Shychoski, Lara.

In: Anatomical Record, Vol. 292, No. 9, 01.09.2009, p. 1338-1351.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A comparison of the jaw mechanics in hadrosaurid and ceratopsid dinosaurs using finite element analysis

AU - Bell, Phil R.

AU - Snively, Eric

AU - Shychoski, Lara

PY - 2009/9/1

Y1 - 2009/9/1

N2 - Hadrosaurid and ceratopsid dentaries display traits that suggest divergent functions toward broadly similar diets of fibrous plants. Computed tomographic scans of dentaries of a lambeosaurine and a centrosaurine (Centrosaurus aptertus) were used to compare feeding function of these animals using finite element analysis (FEA). In the hadrosaur, mediolateral expansion of the dentary and elongation of the coronoid process of the surangular were optimally developed to withstand torsion associated with transverse-isognathous jaw occlusion. FEA results strongly suggest longitudinal rotation of the hadrosaurid mandible. Mediolaterally compressed mandibles and FEA stress for the ceratopsid are in compliance with purely isognathous jaw adduction, although palinal retraction during the powerstroke cannot be ruled out. The ceratopsid dentary is further reinforced by a longitudinal ridge on the lateral surface of that element. Surface texture indicating Sharpey's fibers within the ceratopsid coronoid process suggests greater bite force than in lambeosaurines. These findings corroborate previous interpretations and suggest complementary or alternative kinematics to maxillary pleurokinesis in hadrosaurs.

AB - Hadrosaurid and ceratopsid dentaries display traits that suggest divergent functions toward broadly similar diets of fibrous plants. Computed tomographic scans of dentaries of a lambeosaurine and a centrosaurine (Centrosaurus aptertus) were used to compare feeding function of these animals using finite element analysis (FEA). In the hadrosaur, mediolateral expansion of the dentary and elongation of the coronoid process of the surangular were optimally developed to withstand torsion associated with transverse-isognathous jaw occlusion. FEA results strongly suggest longitudinal rotation of the hadrosaurid mandible. Mediolaterally compressed mandibles and FEA stress for the ceratopsid are in compliance with purely isognathous jaw adduction, although palinal retraction during the powerstroke cannot be ruled out. The ceratopsid dentary is further reinforced by a longitudinal ridge on the lateral surface of that element. Surface texture indicating Sharpey's fibers within the ceratopsid coronoid process suggests greater bite force than in lambeosaurines. These findings corroborate previous interpretations and suggest complementary or alternative kinematics to maxillary pleurokinesis in hadrosaurs.

KW - Dentary

KW - Dinosaurs

KW - Functional morphology

KW - Hadrosaurid

UR - http://www.scopus.com/inward/record.url?scp=73249140358&partnerID=8YFLogxK

U2 - 10.1002/ar.20978

DO - 10.1002/ar.20978

M3 - Article

C2 - 19711463

AN - SCOPUS:73249140358

VL - 292

SP - 1338

EP - 1351

JO - Anatomical Record

JF - Anatomical Record

SN - 1932-8486

IS - 9

ER -