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Effects of aging on the mechanical behavior of human dentin ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
12506 794 2005 11 PDF Available
Title
Effects of aging on the mechanical behavior of human dentin ☆
Abstract

An experimental study on the mechanical behavior of human dentin and the influence of age was conducted. Beams with rectangular cross-section were sectioned from the coronal dentin of virgin extracted molars (N=76) that were obtained from (N=70) patients between 17 and 80 years of age. The beams were loaded in either quasi-static 4-point flexure or 4-point flexural fatigue to failure and the stiffness, strength and fatigue properties were evaluated. In characterizing the fatigue response the beams were divided into two age groups that were regarded as young (17⩽age⩽30, mean±std. dev.=25±5 years) and old (50⩽age⩽80, mean±std. dev.=64±9 years) dentin. Results from monotonic loading showed that both the flexural strength and strain to fracture of dentin decreased significantly with age. The fatigue life of dentin increased with a reduction in cyclic stress amplitude and the fatigue strength of young dentin was greater than that of old dentin at all cyclic stress amplitudes. The endurance strength of young dentin (at 107 cycles) was approximately 44 MPa, whereas the old dentin exhibited an endurance strength of approximately 23 MPa.Based on differences in the mechanical behavior and microscopic features of the fracture surfaces from the young and old specimens, aging appears to result in an increase in both the rate of damage initiation and propagation in dentin.

Keywords
Age; Dentin; Fatigue; Fracture
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Effects of aging on the mechanical behavior of human dentin ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 18, June 2005, Pages 4051–4061
Authors
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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
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us