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Fatigue susceptibility of an endodontic fibre post material
Author(s) -
Barbizam J. V. B.,
White S. N.
Publication year - 2014
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12135
Subject(s) - materials science , dentistry , composite material , orthodontics , medicine
Aim To evaluate effects of ageing and fatigue on the elastic modulus and short‐beam shear strength of a quartz fibre/epoxy resin post material. Methodology Cylindrical specimens (25 × 2.2 mm) were made. Elastic moduli were dynamically measured before immersion in water; after immersion in water; periodically during storage in water for up to 7 years; periodically during thermal cycling in water for up to 10 000 cycles to produce thermo‐mechanical fatigue; and periodically during boiling in water for up to 100 h. After ageing, the specimens underwent short‐beam shear strength testing. Results Elastic modulus was significantly decreased by thermal cycling and by immersion in boiling water, but not by water storage. Short‐beam shear strength was profoundly decreased by all three ageing processes. Short‐beam shear strength was much more sensitive than elastic modulus to the ageing or fatigue processes applied in this study. Conclusions A representative endodontic fibre post material was susceptible to a variety of ageing and fatigue processes. The effects of ageing and fatigue had a more pronounced impact on short‐beam shear strength than on elastic modulus. The effects of boiling in water and thermal cycling in water were considerably larger than those of simple storage in water.