Influence of oval and circular post placement using different resin cements on push‐out bond strength and void volume analysed by micro‐CT. (18th December 2015)

• Record Type: Journal Article
• Authors: Uzun, I.; Keleş, A.; Arslan, H.; Güler, B.; Keskin, C.; Gündüz, K.
• Is Part Of: International endontic journal. Volume 49:Number 12(2016:Dec.)
• Page Start: 1175
• Page End: 1182
• Publication Date: 2015-12-18
• Subjects: fibre post -- micro‐computed tomography -- oval–circular -- oval‐shaped canals -- push‐out -- self‐adhesive; Endodontics -- Periodicals; 617.6342
• DOI: 10.1111/iej.12568
• Languages: English
• ISSNs: 0143-2885

Abstract

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‐wayanova, 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.