Property variations in the prism and the organic sheath within enamel by nanoindentation

Ge, Jun; Cui, Fuzhai; Wang, X.M.; Feng, Hailan

doi:10.1016/j.biomaterials.2004.07.059

Cited by 171 publications

(122 citation statements)

References 15 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…Regarding the effect of structural domains such as enamel prisms and sheath on surface properties, the authors strongly agree with Ge et al 22) . The differences in the orientation of structural units and apatite crystals affect the material properties such as hardness and roughness.…”

Section: Discussionsupporting

confidence: 81%

The effects of acid etching time on surface mechanical properties of dental hard tissues

Zafar

Ahmed

2015

Dental Materials Journal

View full text Add to dashboard Cite

The objective of this study was to evaluate the effect of etching time on the surface properties of dental hard tissues including enamel and dentin. For this purpose, samples were prepared using extracted human teeth and treated with 37% phosphoric acid for various length of time using the set protocol. The effects of etching time on surface roughness were assessed using non-contact surface roughness profilometer and surface hardness was measured using nanoindentation technique. All results were analyzed statistically using SPSS computer software. Within the limitation of this study, it was concluded that etching time influences on the surface properties of dental hard tissues particularly the enamel. Enamel surface properties such as roughness and hardness can be altered remarkable as a matter of few seconds. Prolonged etching time than recommended is likely to increase the surface roughness and decrease surface hardness; compromising the bond strength of adhesive materials in clinical applications.

show abstract

Section: Discussionsupporting

confidence: 81%

The effects of acid etching time on surface mechanical properties of dental hard tissues

Zafar

Ahmed

2015

Dental Materials Journal

View full text Add to dashboard Cite

show abstract

“…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. Typically, the tooth enamel nanocomposite showed nanohardness ( ) and Young's modulus ( ) in the range of 3 to 5 GPa and 80 to 120 GPa, respectively [5-8, 14, 15].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Enamel Nanocomposite

Biswas

Dey

Kundu³

et al. 2013

ISRN Biomaterials

View full text Add to dashboard Cite

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.

show abstract

“…In dental enamel, local mechanical heterogeneity arises from the different density and strength of mineral crystallites within the prisms and sheaths of the structure (8). Therefore, our results suggest that such periodic variation of the local mechanical reinforcement in enamel may be one of the underlying mechanisms that provides the tooth with a remarkable resistance against wear during mastication loads.…”

Section: Resultsmentioning

confidence: 70%

“…Structures with periodically modulated and graded local mechanical properties occur frequently in biological materials, as in the spicules of sea sponges (5,6), mussel threads (7), and dental enamel (8). Despite their repeated occurrence in many strong and tough biological materials, such locally varying mechanical properties have been until recently overseen as an important crack-arresting mechanism in biological materials (6).…”

mentioning

confidence: 99%

Periodically microstructured composite films made by electric- and magnetic-directed colloidal assembly

Demirörs

Courty

Libanori

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Living organisms often combine soft and hard anisotropic building blocks to fabricate composite materials with complex microstructures and outstanding mechanical properties. An optimum design and assembly of the anisotropic components reinforces the material in specific directions and sites to best accommodate multidirectional external loads. Here, we fabricate composite films with periodic modulation of the soft-hard microstructure by simultaneously using electric and magnetic fields. We exploit forefront directed-assembly approaches to realize highly demanded material microstructural designs and showcase a unique example of how one can bridge colloidal sciences and composite technology to fabricate next-generation advanced structural materials. In the proof-of-concept experiments, electric fields are used to dictate the position of the anisotropic particles through dielectrophoresis, whereas a rotating magnetic field is used to control the orientation of the particles. By using such unprecedented control over the colloidal assembly process, we managed to fabricate ordered composite microstructures with up to 2.3-fold enhancement in wear resistance and unusual site-specific hardness that can be locally modulated by a factor of up to 2.5.L ightweight composites offer an attractive alternative toward minimization of the energy demand of mobility systems from automobiles and airplanes to trains and ships. Continuous stiff fibers or discontinuous anisotropic particles have often been used as reinforcing phase to enhance the specific mechanical properties of such lightweight polymer-based composites. Although the fabrication costs of long-fiber reinforced composites remain prohibitive for the large-scale production of high-performance materials, the processing of polymer-based composites reinforced with discontinuous stiff elements can often be adapted to the automated manufacturing processes commonly used in the polymer industry, such as injection molding. However, these fabrication processes usually offer a limited control over the alignment and spatial distribution of the reinforcing particles, preventing a full optimization of the microstructural design in composite materials. Thus, the development of new strategies to assemble microstructured composites with tailored reinforcing architectures is crucial for the design and fabrication of even lighter and cheaper structural materials.Control over the spatial distribution and orientation of particles in composites can be achieved using colloidal assembly tools that guide/template the organization of the reinforcing particles while the material is still in a fluid state. Recently, we have shown that control of particle orientation using an external magnetic field can lead to a significant increase in the materials' resistance against deformation, wear, and crack initiation, widening their range of applications (1, 2). Independent of orientation control, tuning the spatial distribution of particles through magnetic fields, centrifugal forces, or film welding techniq...

show abstract

Property variations in the prism and the organic sheath within enamel by nanoindentation

Cited by 171 publications

References 15 publications

The effects of acid etching time on surface mechanical properties of dental hard tissues

The effects of acid etching time on surface mechanical properties of dental hard tissues

Mechanical Properties of Enamel Nanocomposite

Periodically microstructured composite films made by electric- and magnetic-directed colloidal assembly

Contact Info

Product

Resources

About