Finite element modelling of squirrel, guinea pig and rat skulls: using geometric morphometrics to assess sensitivity

摘要: Rodents are defined by a uniquely specialized dentition and highly complex arrangement of jaw-closing muscles. Finite element analysis (FEA) is an ideal technique to investigate the biomechanical implications these specializations, but it essential understand fully degree influence different input parameters FE model have confidence in model's predictions. This study evaluates sensitivity models rodent crania elastic properties materials, loading direction, location orientation models' constraints. Three were constructed squirrel, guinea pig rat skulls. Each was loaded simulate biting on incisors, first third molars, with angle incisal bite varied over range 45°. The Young's moduli bone teeth components between limits findings from our own previously published tests material properties. Geometric morphometrics (GMM) used analyse resulting skull deformations. Bone stiffness found strongest results all three rodents, followed position, then muscle orientation. Tooth shown little effect deformation skull. position species, mesiodistal tooth being most important squirrels pigs, whereas bilateral vs. unilateral had greatest rats. A GMM isolated incisor deformations showed that, for parameter, tooth. here elucidate which when defining models, also provide interesting glimpses differences skulls, will be explored future publications.