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The Scientific World Journal
Volume 2014, Article ID 239754, 6 pages
http://dx.doi.org/10.1155/2014/239754
Research Article

An In Vitro Assessment of Gutta-Percha Coating of New Carrier-Based Root Canal Fillings

1Department of Conservative Dentistry, King’s College London Dental Institute, Floor 25, Tower Wing, Guy’s Hospital, London Bridge, London SE1 9RT, UK
2Biomaterials, Biomimetics, Biophotonics Research Division, King’s College London Dental Institute, Floor 17, Tower Wing, Guy’s Hospital, London Bridge, London SE1 9RT, UK
3Department of Restorative Dentistry, King’s College London Dental Institute, Floor 25, Tower Wing, Guy’s Hospital, London Bridge, London SE1 9RT, UK

Received 12 December 2013; Accepted 6 January 2014; Published 6 March 2014

Academic Editors: C. H. Pameijer, G. Plotino, and E. Velasco-Ortega

Copyright © 2014 Raghad Abdulrazzaq Alhashimi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The first aim of this paper was to evaluate the push-out bond strength of the gutta-percha coating of Thermafil and GuttaCore and compare it with that of gutta-percha used to coat an experimental hydroxyapatite/polyethylene (HA/PE) obturator. The second aim was to assess the thickness of gutta-percha around the carriers of GuttaCore and HA/PE obturators using microcomputed tomography (μCT). Ten (size 30) 1 mm thick samples of each group (Thermafil, GuttaCore, and HA/PE) were prepared. An orthodontic wire with a diameter of 0.5 mm was attached to the plunger of an Instron machine in order to allow the push-out testing of the gutta-percha coating. Five samples of (GuttaCore and HA/PE) were scanned using μCT. The data obtained were analysed with one-way analysis of variance and Tukey post hoc test. HA/PE obturators exhibited significantly higher push-out bond strength () determined at 6.84 ± 0.96 than those of Guttacore around 3.75 ± 0.75 and Thermafil at 1.5 ± 0.63. GuttaCore demonstrated significantly higher bond strength than Thermafil (). μCT imaging revealed that the thickness of gutta-percha around the experimental HA/PE carrier was homogeneously distributed. The bondability and thickness of gutta-percha coating around HA/PE carriers were superior to those of GuttaCore and Thermafil obturators.