Biomedical Engineering Reference
In-Depth Information
(a)
(b)
Figure 8-7. Indentation depth against time,
h
t
'-
t
, curves of (a) creep and (b) backcreep of
different materials. (
h
t
' values of amalgam in (a) were divided by 10 to fit onto the
diagram.)
very limited (less than 0.025
m during the 900 seconds holding period).
Such limited creep response, ~0.03 nm/sec, is within the limit system
thermal drift stability and implied that the viscous properties of these
materials are negligible compared with their elastic-plastic properties.
At the minimum-load holding period (named “
backcreep
” period),
the recovery was prominent only for enamel and amalgam samples but
remained within the instrument's stability range (<0.03 nm/sec) for other
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