Influence of oval and circular post placement using different resin cements on push-out bond strength and void volume analysed by micro-CT.

Abstract:

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.

journal_name

Int Endod J

authors

Uzun I,Keleş A,Arslan H,Güler B,Keskin C,Gündüz K

doi

10.1111/iej.12568

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

1175-1182

issue

12

eissn

0143-2885

issn

1365-2591

journal_volume

49

pub_type

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