Stress relaxation properties of human dentin

Trengrove, Hugh G.; Carter, Gordon M.; Hood, J. A. A.

doi:10.1016/0109-5641(95)80025-5

Cited by 29 publications

(15 citation statements)

References 14 publications

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“…10–21 However, as enamel and dentin are not homogeneous and isotropic materials, they do not obey Hook’s law. Therefore, a comparison of mechanical properties based on the elastic modulus alone is not feasible; it is essential to also consider the stress and strain values.…”

Section: Introductionmentioning

confidence: 99%

Comparison of mechanical property and role between enamel and dentin in the human teeth

Chun

Choi

2014

Journal of Dental Biomechanics

169

114

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The mechanical properties of enamel and dentin were studied using test specimens having the same shape and dimensions because these properties might vary with the experimental conditions and specimen shapes and dimensions. Healthy human teeth were used as specimens for mechanical tests. The stress (MPa), strain (%), and elastic modulus (E, MPa) of the specimens were obtained from compression tests. The maximum stresses of the enamel, dentin, and enamel–dentin specimens were 62.2 ± 23.8, 193.7 ± 30.6, and 126.1 ± 54.6 MPa, respectively. The maximum strains of the enamel, dentin, and enamel–dentin specimens were 4.5 ± 0.8%, 11.9 ± 0.1%, and 8.7 ± 2.7%, respectively. The elastic moduli of the enamel, dentin, and enamel–dentin specimens were 1338.2 ± 307.9, 1653.7 ± 277.9, and 1628.6 ± 482.7 MPa, respectively. The measured hardness value of enamel specimens (HV = 274.8 ± 18.1) was around 4.2 times higher than that of dentin specimens (HV = 65.6 ± 3.9). Judging from the measured values of the stress and strain of enamel specimens, enamel tended to fracture earlier than dentin; therefore, it was considered more brittle than dentin. However, judging from the measured hardness values, enamel was considered harder than dentin. Therefore, enamel has higher wear resistance, making it suitable for grinding and crushing foods, and dentin has higher force resistance, making it suitable for absorbing bite forces. The different mechanical roles of enamel and dentin may arise from their different compositions and internal structures, as revealed through scanning electron micrographs of enamel and dentin.

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Section: Introductionmentioning

confidence: 99%

Comparison of mechanical property and role between enamel and dentin in the human teeth

Chun

Choi

2014

Journal of Dental Biomechanics

169

114

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“…But hydration is also highly relevant to the mechanical behavior of dentin. Trengrove et al12 noted that stress relaxation in human dentin decreased after air‐drying in comparison to fully hydrated dentin. Dehydration has been found to cause an increase in the elastic modulus and ultimate strength of dentin 13.…”

Section: Introductionmentioning

confidence: 99%

Hydration and dynamic fatigue of dentin

Arola

Zheng

2006

J Biomedical Materials Res

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An experimental investigation on the dynamic fatigue response of dentin was conducted to examine the influence of stress rate on the strength and energy to fracture. Rectangular beams were prepared from the coronal dentin of bovine maxiallary molars and subjected to fourpoint flexure to failure. The dentin beams were examined in the fully hydrated and dehydrated condition at stress rates ( ) ranging from 0.01 to 100 MPa/s. Results for the hydrated dentin showed that the flexure strength, energy to fracture, and flexure modulus all increased with increasing stress rate; the flexure strength increased from 100 MPa (( ) ϭ 0.01 MPa/s) to 250 MPa (( ) ϭ 100 MPa/s). In contrast, the elastic modulus and strength of the dehydrated dentin decreased with increasing stress rate; the flexural strength of the dehydrated dentin deceased from 170 MPa (( ) ϭ 0.01 MPa/s) to 100 MPa (( ) ϭ 100 MPa/s). While the hydrated dentin behaved more like a brittle material at low stress rates, the strain to fracture was found to be nearly independent of ( ). According to the experimental results, restorative conditions that cause development of static stresses within the tooth could promote a decrease in the damage tolerance of dentin.

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“…It would be of interest to compare the viscoelastic moduli of these materials to those of natural tooth tissue. It has been shown that the relaxation modulus of human dentin has a linear dependence on the logarithm of time [36], indicating that dentin is also a viscoelastic material. The linear dependence of relaxation or creep on log time has been shown by Gent [37] to be applicable for elastomers and Braden and Wilson [38] for glass ionomer cements.…”

Section: Discussionmentioning

confidence: 99%

Effect of Beverages on Viscoelastic Properties of Resin-Based Dental Composites

et al. 2015

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The viscoelastic properties of three commercially available resin-based composites (Filtek™ P60, Filtek™ Supreme, and Filtek™ Z250; 3M ESPE, Bracknell, UK) were measured to determine the effect of beverages on their storage moduli and damping ratios. Rectangular samples of the three hybrid composites were immersed in three beverages at 37 °C for 1, 7, 30, and 60 days. At each time interval, these samples were subjected to three-point bend tests in temperature mode using a Perkin Elmer DMA7 Dynamic Mechanical Analyzer (Perkin Elmer Corp., Waltham, MA, USA) to measure the storage modulus and damping ratio. The immersion time had significant influence on the viscoelastic property of composites and it was found that generally for all samples the storage modulus was reduced, whereas damping values increased with immersion time. The viscoelastic behavior of tested materials seems to be related to the pH environment, hydrophilicity and the chemical composition of composites.

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Stress relaxation properties of human dentin

Cited by 29 publications

References 14 publications

Comparison of mechanical property and role between enamel and dentin in the human teeth

Comparison of mechanical property and role between enamel and dentin in the human teeth

Hydration and dynamic fatigue of dentin

Effect of Beverages on Viscoelastic Properties of Resin-Based Dental Composites

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