title: An in vitro assessment of gutta-percha coating of new carrier-based root canal fillings.
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 ( μ CT). 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 μ CT. 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 (P < 0.001) 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 (P < 0.001). μ CT 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.
authors.affiliation: Department of Conservative Dentistry, King's College London Dental Institute, Floor 25, Tower Wing, Guy's Hospital, London Bridge, London SE1 9RT, UK ; Biomaterials, Biomimetics, Biophotonics Research Division, King's College London Dental Institute, Floor 17, Tower Wing, Guy's Hospital, London Bridge, London SE1 9RT, UK.
authors.forename: Raghad Abdulrazzaq
authors.initials: RA
authors.lastname: Alhashimi
authors.affiliation: Department of Restorative Dentistry, King's College London Dental Institute, Floor 25, Tower Wing, Guy's Hospital, London Bridge, London SE1 9RT, UK.
authors.forename: Richard
authors.initials: R
authors.lastname: Foxton
authors.affiliation: Biomaterials, Biomimetics, Biophotonics Research Division, King's College London Dental Institute, Floor 17, Tower Wing, Guy's Hospital, London Bridge, London SE1 9RT, UK.
authors.forename: Shihab
authors.initials: S
authors.lastname: Romeed
authors.affiliation: Biomaterials, Biomimetics, Biophotonics Research Division, King's College London Dental Institute, Floor 17, Tower Wing, Guy's Hospital, London Bridge, London SE1 9RT, UK.
authors.forename: Sanjukta
authors.initials: S
authors.lastname: Deb
mesh_terms: D006171:Gutta-Percha / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation; D055114:X-Ray Microtomography
chemical_list: D012387:Root Canal Filling Materials; D006171:Gutta-Percha