TY - GEN
T1 - FRACTURE PROPERTIES OF CORTICAL BONE AND DENTIN
AU - Kruzic, J. J.
AU - Nalla, R. K.
AU - Ritchie, R. O.
AU - Kinney, J. H.
PY - 2004/4
Y1 - 2004/4
N2 - In order to assess the fracture properties of cortical bone and dentin, in vitro R-curve experiments were performed on human cortical bone (34 - 99 year-old humeri) and elephant dentin specimens hydrated in Hanks' Balanced Salt Solution. Experiments yielded toughness values very similar to ceramics, with R-curves rising over the range of 1 - 3.5 MPa√m for dentin and 2 - 5 MPa√m for human cortical bone; such R-curve behavior was attributed in both cases to the formation of bridging ligaments in the crack wake. Crack bridges were observed both by microscopy and X-ray tomographic techniques, and the extent and nature of the bridging zones were quantitatively characterized using compliance based experiments. In contrast to ceramics, both of these materials exhibit viscoplastic (creep) deformation behavior at room temperature, which leads to considerable time-dependent crack tip blunting. Additionally, time-dependent cracking behavior (static fatigue) was observed in both cortical bone and dentin; however, for dentin, crack arrest occurred quite quickly due to the rapid rate of crack blunting. Finally, the effects of dehydration and age on the fracture properties were also considered with the goal of gaining a micro-mechanistic understanding of the resistance to fracture in these structural biomaterials.
AB - In order to assess the fracture properties of cortical bone and dentin, in vitro R-curve experiments were performed on human cortical bone (34 - 99 year-old humeri) and elephant dentin specimens hydrated in Hanks' Balanced Salt Solution. Experiments yielded toughness values very similar to ceramics, with R-curves rising over the range of 1 - 3.5 MPa√m for dentin and 2 - 5 MPa√m for human cortical bone; such R-curve behavior was attributed in both cases to the formation of bridging ligaments in the crack wake. Crack bridges were observed both by microscopy and X-ray tomographic techniques, and the extent and nature of the bridging zones were quantitatively characterized using compliance based experiments. In contrast to ceramics, both of these materials exhibit viscoplastic (creep) deformation behavior at room temperature, which leads to considerable time-dependent crack tip blunting. Additionally, time-dependent cracking behavior (static fatigue) was observed in both cortical bone and dentin; however, for dentin, crack arrest occurred quite quickly due to the rapid rate of crack blunting. Finally, the effects of dehydration and age on the fracture properties were also considered with the goal of gaining a micro-mechanistic understanding of the resistance to fracture in these structural biomaterials.
UR - https://www.scopus.com/pages/publications/23744516020
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-23744516020&origin=recordpage
U2 - 10.1002/9781118408414.ch7
DO - 10.1002/9781118408414.ch7
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 1574981854
SN - 9781574981858
T3 - Ceramic Transactions
SP - 53
EP - 62
BT - Bioceramics: Materials and Applications V
A2 - Sundar, Veeraraghavan (V)
A2 - Rusin, Richard P.
A2 - Rutiser, Claire A.
PB - American Ceramic Society
CY - Westerville, Ohio
T2 - 106th Annual Meeting of the American Ceramic Society
Y2 - 18 April 2004 through 21 April 2004
ER -