Nano-scale structure and mechanical properties of the human dentine–enamel junction

Chan, Y.L.; Ngan, A.H.W.; King, Nigel M.

doi:10.1016/j.jmbbm.2010.09.003

Cited by 62 publications

(45 citation statements)

References 34 publications

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“…Both the nanohardness ( ), Figure 4(a), and Young's moduli ( ), Figure 4(b), of enamel nanocomposite were much higher than those of dentin region. Thus, the experimental observations made in the present work were similar to the data reported in the literature [4,25,26]. The elastic recovery was much more in the enamel nanocomposite ( Figure 5(a)) than in dentin region while the plastic deformation was much more in dentin ( Figure 5(b)) than in the enamel nanocomposite region.…”

Section: Resultssupporting

confidence: 90%

“…It is well known that DEJ is a thin layer with properties changing from dentin region to the enamel nanocomposite region. The dentinal fibers terminate into the junction where the HAP crystallites start showing the enamel nanocomposite characteristics [4]. Therefore, considering the huge importance of the DEJ, it is not surprising that many researchers reported nanohardness ( ) and Young's modulus ( ) of enamel nanocomposite [5][6][7][8][9][10][11][12][13][14][15][16][17][18] wherein occasionally attempts were also made to apply the "Rule of Mixtures" [19][20][21] to predict Young's modulus data.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Enamel Nanocomposite

Biswas

Dey

Kundu³

et al. 2013

ISRN Biomaterials

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For adult Indian premolar teeth, we report for the first time ever the simultaneous evaluations of nanohardness, Young's modulus, and fracture toughness of the enamel nanocomposite. The nanohardness and Young's moduli were evaluated from near the beginning of the middle enamel region to within ∼10 m of the dentino-enamel junction (DEJ) and in the dentin region using the nanoindentation technique. The fracture toughness from near the middle of the enamel region to near the DEJ zone was measured using the microindentation technique. The deformation was studied using scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM). The relative differences in the extents of biomineralization in the enamel and dentin regions were studied by the energy dispersive X-ray (EDS) technique. The variations of the toughness of the enamel as a function of the toughness of the protein matrix phase have been analyzed which showed that the predicted value of the toughness of the protein present in the nanocomposite was comparable to that of other bioproteins reported in the literature. Further, the work of fracture estimated from the measured value of toughness of the enamel nanocomposite agreed well with the experimental data reported in the literature.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Enamel Nanocomposite

Biswas

Dey

Kundu³

et al. 2013

ISRN Biomaterials

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“…For example, a dentine-enamel junction (DEJ) is a thin [2.0 ± 1.1 lm (Habelitz et al 2001)] but gradual interface with characteristics transiting from those of dentine to those of enamel. Namely, the collagen fibers in dentine were found to enter into the enamel side of DEJ and terminate in a region in which crystals of biological apatite begin to show enamel characteristics (Chan et al 2011). In addition, the average contents of organic matrix and carbonate ions were found to increase in the order: enamel \ DEJ \ dentin.…”

Section: Teethmentioning

confidence: 99%

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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“…It may be even lower (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) GPa) in regions as close as 500 μm from the pulp [28,29]. Chan et al found that enamel had an elastic modulus of ∼95 GPa, whereas dentin had an elastic modulus of ∼19 GPa from nano-indentation tests [30]. Angker et al found that the elastic modulus of the area near the pulp region was statistically lower than those of dentin in the middle and near the DEJ [29].…”

Section: Discussionmentioning

confidence: 99%

Measurement of biomechanical behavior of dentin hard tissue in response to unbound water loss using stereo-digital image correlation

Chen

Shao

2020

Mater. Res. Express

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Understanding the biomechanical behavior of dentin hard tissue with fluid-filled dentin tubules and hydrated matrices is essential for studying this functionally graded biological composite. The stereodigital image correlation technique with an adaptive high-magnification field of view (FOV) for fully hydrated biological tissue measurement was investigated. The adaptive magnification is controlled by the length of extension tubes. To determine both the unbound water loss induced and load-induced three-dimensional (3D) deformation of dentin hard tissue from a fully hydrated state to a nonhydrated condition, samples of dentin blocks and half teeth in sagittal sections were studied for a period of 2 h in situ over varied speckle patterns. The effects of speckles on water evaporation, camera pre-heating, and measurement accuracy in the wet, curved and long-term measurement were analyzed. The elastic modulus and Poisson's ratio of both dentin and pulp in response to unbound water evaporation were measured. With the unbound water loss, the mean values of the elastic modulus generally increased from ∼8 GPa to ∼10 GPa in pulp region and from ∼10 GPa to ∼12 GPa in dentin region. The mean values of the Poisson's ratio increased both in pulp and in dentin. Poisson's ratio in the dentin regions (∼0.3) were generally smaller than those in the pulp regions (even can reach 0.6), irrespective of the partial dehydration time. Further analysis of the full-field deformation results provided insight into the unbound water-induced regional deformations and mechanical changes in human dentin. It's found that the unbound water loss induced deformations were more prominent when compared to load induced deformations.

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Nano-scale structure and mechanical properties of the human dentine–enamel junction

Cited by 62 publications

References 34 publications

Mechanical Properties of Enamel Nanocomposite

Mechanical Properties of Enamel Nanocomposite

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Measurement of biomechanical behavior of dentin hard tissue in response to unbound water loss using stereo-digital image correlation

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