fulltext.study @t Gmail

Transition behavior in fatigue of human dentin: Structure and anisotropy

Paper ID Volume ID Publish Year Pages File Format Full-Text
10461 685 2007 9 PDF Available
Title
Transition behavior in fatigue of human dentin: Structure and anisotropy
Abstract

The influence of tubule orientation on the transition from fatigue to fatigue crack growth in human dentin was examined. Compact tension (CT) and rectangular beam specimens were prepared from the coronal dentin of molars with three unique tubule orientations (i.e., 0°, 45° and 90°). The CT specimens (N=25) were used to characterize fatigue crack initiation and steady-state cyclic extension, whereas the rectangular beams (N=132) were subjected to 4-pt flexure and used in quantifying the stress-life fatigue response. The transition behavior was analyzed using both the Kitagawa–Takahashi and El Haddad approaches. Results showed that both the fatigue crack growth and stress-life responses were dependent on the tubule orientation. The average Paris Law exponent for crack growth perpendicular (90°) to the tubules (m=13.3±1.1) was significantly greater (p<0.05) than that for crack growth oblique (45°) to the tubules (m=11.5±1.87). Similarly, the fatigue strength of dentin with 90° tubule orientation was significantly lower (p<0.05) than that for the other two orientations, regardless of the range of cyclic stress. The apparent endurance strengths of specimens with 0° (44 MPa) and 45° (53 MPa) orientations were nearly twice that of the 90° (24 MPa) orientation. Based on these results, human dentin exhibits the largest degree of anisotropy within the stress-life regime and the transition from fatigue to fatigue crack growth occurs under the lowest cyclic stress range when the tubules are aligned with the cyclic normal stress (90° orientation).

Keywords
Anisotropy; Dentin; Fatigue; Fracture; Tubules
First Page Preview
Transition behavior in fatigue of human dentin: Structure and anisotropy
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 28, Issue 26, September 2007, Pages 3867–3875
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us