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Influence of oval and circular post placement using different resin cements on push‐out bond strength and void volume analysed by micro‐ CT
Author(s) -
Uzun I.,
Keleş A.,
Arslan H.,
Güler B.,
Keskin C.,
Gündüz K.
Publication year - 2016
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.12568
Subject(s) - bond strength , materials science , universal testing machine , cement , composite material , void (composites) , post hoc , adhesive , statistical analysis , volume (thermodynamics) , dentistry , mathematics , ultimate tensile strength , medicine , physics , layer (electronics) , statistics , quantum mechanics
Aim To evaluate the percentage volume of voids within cement layers, to determine the push‐out bond strength of circular and oval fibre posts luted with different commercial resin cements in oval cross‐sectional root canals, and to correlate push‐out bond strength values and volume of voids of circular and oval fibre posts. Methodology Seventy‐two mandibular premolars with oval‐shaped root canals were selected. The specimens were divided into two main groups according to the post type (oval and circular). Groups were further divided into three subgroups ( n = 24) according to resin cement type: Maxcem Elite, Rely‐X Unicem and Duo‐Link. The volumes of voids within the cements were analysed by micro‐computed tomography (micro‐ CT ). The bond strength was then measured using a push‐out test with an Instron universal testing machine. The failure modes were evaluated. Statistical analyses were performed using a three‐way anova , Tukey's post hoc , Pearson's correlation and chi‐square test ( P = 0.05). Results The push‐out bond strength values were significantly affected by root canal region, post type and cement type ( P < 0.001). Root canal region, post type and cement type also significantly affected void volume ( P < 0.001). There was a significant interaction between post type and cement type ( P < 0.001). The most frequent failure type was adhesive failure in all the groups. There was no significant correlation between the push‐out bond strength and void volume ( P > 0.05). Conclusions Void volume did not affect push‐out bond strength of oval and circular posts luted in oval canals.