Spherical indentation of tooth enamel

  title={Spherical indentation of tooth enamel},
  author={Mike Staines and William Henry Robinson and James A.A. Hood},
  journal={Journal of Materials Science},
Spherical indentation measurements were made on enamel surfaces of intact human teeth. From the load versus depth of indentation curve Young's modulus was found to be typically 8.3×1010 Pa and the yield stress to be 3.3×108 Pa. Young's modulus was observed to vary with moisture content and with the orientation of the enamel surface. Viscoelastic behaviour was evident, also depending on the moisture content of the enamel. 
Elastic modulus and stress-strain response of human enamel by nano-indentation.
In conclusion, prism-sheath structure played an important role in determining the mechanical properties as well as the localized fracture of enamel.
Nano-Indentation Measurement of Fracture Toughness of Dental Enamel
Effect of orthodontic bracket bonding-debonding on fracture toughness of human dental enamel was investigated by using nano-indentation test. For this purpose, some ceramic brackets were bonded by a
Size dependent elastic modulus and mechanical resilience of dental enamel.
In this work, tooth specimens are prepared under hydrated conditions and their stiffnesses are measured by depth control across the thickness of enamel, and effective crystal orientation angle is calculated and found to facilitate shear sliding in enamel under mechanical contact.
Structural Integrity of Enamel: Experimental and Modeling
It is reported that enamel can absorb indentation energy through shear deformation within its protein layers between apatite crystallites, which will help guide the design of the nanostructural architecture of dental restorative materials.
On the mechanical properties of tooth enamel under spherical indentation.
  • H. Chai
  • Materials Science, Medicine
    Acta biomaterialia
  • 2014
Contact induced deformation of enamel
Teeth survive millions of contact cycles with relatively limited damage and wear, despite high local contact stresses. In this letter, the authors investigated the influence of enamel microstructure
Nanoindentation mapping of the mechanical properties of human molar tooth enamel.
N nanoindentation is used to map out the properties of dental enamel over the axial cross-section of a maxillary second molar, finding that local variations in mechanical characteristics were correlated with changes in chemical content and microstructure across the entire depth and span of a sample.
Determination of the elastic/plastic transition of human enamel by nanoindentation.
Exceptional contact elasticity of human enamel in nanoindentation test.
The results suggested that the increase of the elastic limit during high-loading strain was associated with exceptional contact elasticity at the nanoscale of the enamel structure and the consequent extension of the contact area, thus reinforcing the bulk structure.


The toughness of tooth enamel, a natural fibrous composite
It is suggested on the basis of experiments carried out in vitro on whole caries-free human premolars that the energy absorbing capacity (mechanical toughness) of the enamel depends upon the
Young's modulus of lignin from a continuous indentation test
The deformation of lignin in a continuous ball indentation test was almost entirely elastic up to a stress of 2.2 × 108 Pa (22 kg mm−2). The load versus depth of indentation curve of the lignin
Physical properties of human tooth enamel and enamel sheath material under load.
  • D. J. Haines
  • Materials Science, Medicine
    Journal of biomechanics
  • 1968
The ability of enamel to change its volume under load is considered and its ‘effective’ Poisson's ratio is discussed and particular reference is made to the spread of caries lesions in enamel.
Electron Probe Microanalysis of Noncarious Enamel and Dentin and Calcified Tissues in Mottled Teeth
A quantitative chemical distribution of five elements in several undecalcified sections of teeth was determined by the electron microprobe method. The calcium (Ca)/ phosphorus (P) weight percent
Hard tissue as a composite material. I. Bounds on the elastic behavior.
  • J. Katz
  • Materials Science, Medicine
    Journal of biomechanics
  • 1971
It is shown that such a model alone cannot be used to describe the behavior of bone, and the existence of a non-linear dependence of elastic moduli on composition of hard tissue is indicated.
Compressive Properties of Enamel, Dental Cements, and Gold
The compressive properties of human enamel and dentin have been reported by Stanford, Paffenbarger, Kumpula, and Sweeney.' The elastic modulus of occlusal, side, and cusp enamel was reported to be
The elastic properties of hard tissues and apatites.
The pressure dependence of the elastic constants of various halides, hard tissues and synthetic apatites have been examined using a solid media, pressure apparatus coupled with an ultrasonic interferometer to assess the effects of porosity in aggregate samples and to make measurements on specimens of ideal density.
Elastic properties of bovine dentine and enamel.
Stress-strain curve for aluminium from a continuous indentation test
Continuous indentation tests using a 6.35 mm diameter steel ball were carried out on polycrystalline aluminium (99.995%) at forces up to 942 N (96 kg) and a total displacement of 65μm. On loading the
Theoretical determination of composite material elastic compliances
Abstract A method has been developed which enables the elastic symmetry and all the elastic compliances of any composite material to be theoretically determined on the basis of geometry and component