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Experimental polyethylene–hydroxyapatite carrier‐based endodontic system: an in vitro study on dynamic thermomechanical properties, sealing ability, and measurements of micro‐computed tomography voids
Author(s) -
Alhashimi Raghad A.,
Mannocci Francesco,
Sauro Salvatore
Publication year - 2016
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12265
Subject(s) - materials science , root canal , composite material , viscoelasticity , dynamic mechanical analysis , polyethylene , dynamic modulus , composite number , extrusion , modulus , dentistry , polymer , medicine
The dynamic thermomechanical properties, sealing ability, and voids formation of an experimental obturation hydroxyapatite‐reinforced polyethylene ( HA / PE ) composite/carrier system were investigated and compared with those of a commercial system [GuttaCore ( GC )]. The HA / PE system was specifically designed using a melt‐extrusion process. The viscoelastic properties of HA / PE were determined using a dynamic thermomechanical analyser. Human single‐rooted teeth were endodontically instrumented and obturated using HA / PE or GC systems, and then sealing ability was assessed using a fluid filtration system. In addition, micro‐computed tomography ( μ CT ) was used to quantify apparent voids within the root‐canal space. The data were statistically analysed using one‐way anova and post hoc tests. The HA / PE composite exhibited important modulus and damping changes with an increase of temperature. The HA / PE system was more flexible than GC as the modulus of GC appeared to be significantly higher than that of HA / PE as a result of the high positive glass transition temperature ( T g ). However, HA / PE and GC presented similar sealing abilities. In conclusion, because sealing ability and voids formation were comparable between the tested materials, the experimental HA / PE system may be considered a suitable alternative material for root‐canal obturation. Moreover, HA / PE possesses specific viscoelastic behaviour and lower melting points, which may facilitate root‐canal retreatments.