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

• Published in: International endodontic journal 2016-12, Vol.49 (12), p.1175-1182
• Main Authors: Uzun, I., Keleş, A., Arslan, H., Güler, B., Keskin, C., Gündüz, K.
• Format: Article
• Language: English
• Subjects: Dental Bonding - methods; Dental Stress Analysis; Dentistry; fibre post; Humans; micro-computed tomography; Molar - surgery; oval-circular; oval-shaped canals; Post and Core Technique - instrumentation; push-out; Radiography, Dental; Resin Cements - therapeutic use; Root Canal Therapy - instrumentation; Root Canal Therapy - methods; self-adhesive; X-Ray Microtomography
• ISSN: 0143-2885; 1365-2591
• DOI: 10.1111/iej.12568

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