Enamel dictates whole tooth deformation: A finite element model study validated by a metrology method

Barak, Meir Max; Geiger, Selly; Chattah, Netta Lev-Tov; Shahar, Ron; Weiner, Steve

doi:10.1016/j.jsb.2009.07.019

Cited by 26 publications

(27 citation statements)

References 38 publications

(71 reference statements)

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“…Interestingly, for any given molar these two dimensions do not necessarily scale proportionally between species [5,11,13]. Whereas some work has been reported on the role of elastic modulus (resistance to elastic deformation) on the load-bearing capacity of enamel [14,15], little is known as to how other characteristic material properties of tooth enamel and dentin -hardness (resistance to plastic deformation) and toughness (resistance to crack growth) -might influence the load-bearing capacity of the dentition in different primates. The relative importance of morphological versus material properties also remains somewhat obscure, especially in the context of evolutionary pathways.…”

Section: Introductionmentioning

confidence: 99%

Properties of tooth enamel in great apes

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Properties of tooth enamel in great apes

et al. 2010

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“…1). This mechanical behaviour differs markedly from the one found in crowns with a full enamel cap such as premolars and molars [2], [24].…”

Section: Introductionmentioning

confidence: 63%

The Adaptive Significance of Enamel Loss in the Mandibular Incisors of Cercopithecine Primates (Mammalia: Cercopithecidae): A Finite Element Modelling Study

Kupczik

Chattah

2014

PLoS ONE

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In several primate groups enamel is reduced or absent from the lingual (tongue) side of the mandibular incisor crowns akin to other placental and marsupial mammalian groups such as rodents, lagomorphs and wombats. Here we investigate the presumed adaptation of crowns with unilateral enamel to the incision of tough foods in cercopithecines, an Old World monkey subfamily, using a simulation approach. We developed and validated a finite element model of the lower central incisor of the rhesus macaque (Macaca mulatta) with labial enamel only to compute three-dimensional displacements and maximum principal stresses on the crown subjected to compressive loads varying in orientation. Moreover, we developed a model of a macaque incisor with enamel present on both labial and lingual aspects, thus resembling the ancestral condition found in the sister taxon, the leaf-eating colobines. The results showed that, concomitant with experimental results, the cercopithecine crown with unilateral enamel bends predominantly towards the inside of the mouth, while displacements decreased when both labial and lingual enamel are present. Importantly, the cercopithecine incisor crown experienced lower maximum principal stress on the lingual side compared to the incisor with enamel on the lingual and labial aspects under non-axial loads directed either towards the inside or outside of the mouth. These findings suggest that cercopithecine mandibular incisors are adapted to a wide range of ingestive behaviours compared to colobines. We conclude that the evolutionary loss of lingual enamel in cercopithecines has conferred a safeguard against crown failure under a loading regime assumed for the ingestion (peeling, scraping) of tough-skinned fruits.

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“…Human teeth have a compliant dentin core. Barak et al (2009) mentioned that this core supports an abrasion resistant tough outer enamel layer connected with a soft zone that hinders the delamination from the enamel. A mechanically suitable restorative material withstands stress and strain deformation without overloading its adhesive bonding and the surrounding natural tooth structure.…”

Section: Introductionmentioning

confidence: 87%

“…But in fact the tooth behavior is highly orthotropic, individually and spatially distributed, as well as size-dependent as was mentioned by Ang et al (2010). The simplifications were done on literature data for validated finite-element models by Barak et al (2009). The outer geometry was set containing a cavity with nearly cylindrical geometry (A: r=2.1mm, h=1.5mm or B: r=1.3mm, h=1.75mm) which then was filled by curing the composite (figure 2).…”

Section: Cavity Simulationsmentioning

confidence: 99%

Multiaxial Strength and Stress Forming Behavior of Four Light-Curable Dental Composites

Koplin¹,

Rodriguez²,

Jaeger³

2014

DENT

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The resulting internal stress situation in curing dental composites is still oversimplified due to analytical inaccessibility of local information of state and loading. Similar applies to the strength behavior of cured dental composites. Using recent progress of a finite-element-based curing model, we developed and attempted to benchmark dental composites based on their mechanical behavior and tendency to form internal stress. Additionally, in order to understand the influence of restoration techniques on the mechanical loading, curing simulations were necessary. Three-point flexural strength, compressive strength and diametral tensile strength and the necessary curing parameters were studied for four state-of-the-art dental composites (Tetric EvoCeram, Venus Diamond, EsthetX, Filtek Supreme XT). The investigated composites fracture can be analyzed by the Drucker Prager failure criteria for each composite. The lowest resulting curing stresses were found for Tetric EvoCeram because of its low volumetric shrinkage and a high ratio of initiation phase to dark phase conversion. Venus Diamond showed the best overall mechanical properties because it can withstand tensile as well as compressive stress. In order to draw conclusions on comparisons between several composites, flexural strength tests, volume shrinkage measurements, cavity classifications and general preparation recommendations may still be a suitable way for the simplification of the immense complexity in curing and restoration. Nevertheless, finite-element-based simulations are necessary to include fundamental effects such as stress relaxation by flow and multiaxial strength of the composite.

show abstract

Enamel dictates whole tooth deformation: A finite element model study validated by a metrology method

Cited by 26 publications

References 38 publications

Properties of tooth enamel in great apes

Properties of tooth enamel in great apes

The Adaptive Significance of Enamel Loss in the Mandibular Incisors of Cercopithecine Primates (Mammalia: Cercopithecidae): A Finite Element Modelling Study

Multiaxial Strength and Stress Forming Behavior of Four Light-Curable Dental Composites

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