Abstract:
|
The ai
m of the present work was to analyze the influence of the setting reaction on the
injectability of tricalcium phosphate (TCP) pastes. Even if the injection was performed early after
mixing powder and liquid, powder reactivity was shown to play a significan
t role in the injectability of
TCP pastes. Significant differences were observed between the injection behavior of non
-
hardening β
-
TCP pastes and that of self
-
hardening α
-
TCP pastes. The differences were more marked at low liquid
-
to
-
powder ratios, using fi
ne powders and injecting through thin needles. α
-
TCP was in general less
injectable than β
-
TCP and required higher injection loads. Moreover, clogging was identified as a
mechanism hindering or even preventing injectability, different and clearly distingui
shable from the
filter
-
pressing phenomenon. α
-
TCP pastes presented transient clogging episodes, which were not
observed in β
-
TCP pastes with equivalent particle size distribution. Different parameters affecting
powder reactivity were shown to affect also p
aste injectability. Thus, whereas powder calcination
resulted in an increased injectability due to lower particle reactivity, the addition of setting accelerants,
such as hydroxyapatite nanoparticles, tended to reduce the injectability of the TCP pastes, e
specially if
adjoined simultaneously with a Na2HPO4 solution. Although as a general trend faster setting pastes
were less injectable, some exceptions were found to this rule. For example, whereas in absence of
setting accelerants fine TCP powders were more
injectable than the coarse ones in spite of their
shorter setting times, when setting accelerants were added this trend was inverted, and coarse
powders were more injectable than the fine ones |