|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Biological Materials Science Symposium
||On the Reduction in Crack Growth Resistance of Human Enamel with Age
||Dongsheng Zhang, Mobin Yahyazadehfar, Dwayne Arola
|On-Site Speaker (Planned)
With the increase in dentate seniors, understanding the effects of aging on the mechanical properties of teeth is of substantial importance. In this investigation the fracture toughness of human enamel was evaluated from incremental crack growth experiments performed on tissue of donor teeth representing “young” (17≤ age ≤ 25) and “old” (age ≥ 55) age groups. Results showed that the old enamel exhibited significantly lower resistance to fracture than that of the young tissue. The most striking difference was found for cracks extending transverse to the enamel rods, where the fracture toughness of the old enamel (0.37±0.15 MPa•m^0.5) was nearly 70% lower than that of young teeth (1.23±0.20 MPa•m^0.5). According to results from a hybrid evaluation, the reduction in fracture resistance with age is attributed to a decrease in the degree of extrinsic toughening. These changes are critical to the treatment of senior patients.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)