Aging and fracture of human cortical bone and tooth dentin

Koester, Kurt J.; Ager, Joel W.; Ritchie, Robert O.

doi:10.1007/s11837-008-0068-1

Cited by 8 publications

(6 citation statements)

References 29 publications

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“…There are also some changes in the mineralized collagen matrix with aging, but this is less well understood [98, 99]. Independent studies of the R-curve behavior for crack extension parallel (in plane) [100, 101] and perpendicular [102] to the dentin tubules report significant reductions in the crack growth resistance of dentin with age. Yet, studies of the fatigue behavior have reported slightly conflicting responses.…”

Section: Fatigue Behaviormentioning

confidence: 99%

Fatigue of biomaterials: Hard tissues

Arola

Bajaj

Ivancik

et al. 2010

International Journal of Fatigue

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The fatigue and fracture behavior of hard tissues are topics of considerable interest today. This special group of organic materials comprises the highly mineralized and load-bearing tissues of the human body, and includes bone, cementum, dentin and enamel. An understanding of their fatigue behavior and the influence of loading conditions and physiological factors (e.g. aging and disease) on the mechanisms of degradation are essential for achieving lifelong health. But there is much more to this topic than the immediate medical issues. There are many challenges to characterizing the fatigue behavior of hard tissues, much of which is attributed to size constraints and the complexity of their microstructure. The relative importance of the constituents on the type and distribution of defects, rate of coalescence, and their contributions to the initiation and growth of cracks, are formidable topics that have not reached maturity. Hard tissues also provide a medium for learning and a source of inspiration in the design of new microstructures for engineering materials. This article briefly reviews fatigue of hard tissues with shared emphasis on current understanding, the challenges and the unanswered questions.

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Section: Fatigue Behaviormentioning

confidence: 99%

Fatigue of biomaterials: Hard tissues

Arola

Bajaj

Ivancik

et al. 2010

International Journal of Fatigue

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“…As expected, detrimental changes in the fracture toughness of dentin occur with increasing patient age. Independent studies of crack extension parallel and perpendicular to the dentin tubules show that “old” dentin undergoes a reduction in the crack growth resistance in both orientations. However, there are some unique qualities of the responses.…”

Section: Aging Of Dentinmentioning

confidence: 99%

Microstructure and mechanical behavior of radicular and coronal dentin

Arola¹,

Ivancik²,

Majd³

et al. 2009

Endodontic Topics

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Fracture of root‐filled teeth is not uncommon and appears to be a complex function of both the treatment and the patient's oral regimen. However, there have been few studies aimed at understanding the intrinsic mechanical behavior of dentin and its relevance to the incidence of these fractures. In addition, there has been some controversy over whether the fracture of root‐filled teeth is attributed primarily to loss of tooth structure or if there are other contributing factors. A comprehensive understanding of the structure and mechanical behavior of dentin is of substantial importance to the success of endodontic therapy. Specifically, the importance of fatigue on tooth fractures and the resistance of tissues to both the initiation and propagation of cracks have received scant attention. As well, regional variations in these properties and the contribution of changes in microstructure to the fatigue and fracture behavior are not well understood. This article reviews the importance of microstructure on the mechanical behavior of dentin and compares the mechanical properties of tissue from the root and crown. Also, the changes in microstructure with aging are discussed as well as their importance to the incidence of tooth fracture.

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“…Recent effort has been devoted to the experimental characterization and modeling of the dependence of the fracture resistance of biological composites on the crack length, the so-call "crack extension resistance curve" (R-curve) behavior (Nalla et al, 2003(Nalla et al, , 2004(Nalla et al, , 2005Kinney and Ritchie, 2005;Koester et al, 2008;Launey and Ritchie, 2009;Launey et al, 2010). To the best of our knowledge, much less attention has been given to the increase in fracture resistance due to the finite velocity of cracks, in spite of the fact that even small velocities may generate a non-negligible contribution to the fracture resistance (Sasaki et al, 1993;Okumura, 2002aOkumura, , 2003Ji and Gao, 2004;Iyo et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic fracture of biological composites

Bouchbinder¹,

Brener²

2011

Journal of the Mechanics and Physics of Solids

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Soft constituent materials endow biological composites, such as bone, dentin and nacre, with viscoelastic properties that may play an important role in their remarkable fracture resistance. In this paper we calculate the scaling properties of the quasi-static energy release rate and the viscoelastic contribution to the fracture energy of various biological composites, using both perturbative and non-perturbative approaches. We consider coarse-grained descriptions of three types of anisotropic structures: (i) Liquid-crystal-like composites (ii) Stratified composites (iii) Staggered composites, for different crack orientations. In addition, we briefly discuss the implications of anisotropy for fracture criteria. Our analysis highlights the dominant lengthscales and scaling properties of viscoelastic fracture of biological composites. It may be useful for evaluating crack velocity toughening effects and structure-dissipation relations in these materials.

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Aging and fracture of human cortical bone and tooth dentin

Cited by 8 publications

References 29 publications

Fatigue of biomaterials: Hard tissues

Fatigue of biomaterials: Hard tissues

Microstructure and mechanical behavior of radicular and coronal dentin

Viscoelastic fracture of biological composites

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