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Nanostructured hydroxyapatite as filler for methacrylate-based root canal sealers
F M Collares1, V C B Leitune, F V Rostirolla
1Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, 2492 Rio Branco, Porto Alegre, RS, Brazil. fabricio.collares@ufrgs.br
Aim:
To evaluate the effect of different concentrations of nanostructured hydroxyapatite on the radiopacity, flow and film thickness of an experimental root canal sealer.
Methodology:
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).
Results:
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).
Conclusion:
The addition of up to 40% HA(nano) to root canal sealers did not alter their radiopacity and film thickness.
