International Endodontic Journal 2012-01-01

Nanostructured hydroxyapatite as filler for methacrylate-based root canal sealers.

F M Collares, V C B Leitune, F V Rostirolla, R M Trommer, C P Bergmann, S M W Samuel

Index: Int. Endod. J. 45(1) , 63-7, (2012)

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Abstract

  To evaluate the effect of different concentrations of nanostructured hydroxyapatite on the radiopacity, flow and film thickness of an experimental root canal sealer.  An experimental dual-cured root canal sealer was produced with a methacrylate-based co-monomer blend. Nanostructured hydroxyapatite/calcium tungstate solutions (ratios 10:90, 20:80, 30:70 and 40:60) were added to produce the sealer. Radiopacity was evaluated using a digital system and an aluminium step wedge (n=5). Flow and thickness tests were conducted in accordance with ISO 6876 (n=3). The data were analysed using one-way anova and Tukey's test (α=0.05).  All groups had levels of radiopacity in accordance with ISO 6876. The flow of the experimental sealers was not significantly different (P=0.204). All groups had a film thickness in accordance with ISO 6876 and with no statistical difference (P = 0.654).The addition of up to 40% HA(nano) to root canal sealers did not alter their radiopacity and film thickness.© 2011 International Endodontic Journal.