Fracture resistance of endodontically treated maxillary incisors restored with zirconia posts: effect of the internal plateau preparation

Abstract

We report on a new approach to increase the fracture resistance of endodontically treated teeth. We propose a preparation of horizontal internal plateau (IP) in dentine and the use of retentive zirconia posts to achieve a more favourable load transmission. The aim of our work was to investigate the effect of the IP depth and the post diameter on the fracture resistance and the failure mode of maxillary central incisors. Seventy-two teeth were, divided into six groups of 12. IP 4 mm in diameter and 0, 1 or 2 mm in depth was prepared and zirconia posts of two diameters luted. Specimens were loaded until failure and fractures were classified as reparable or not. Two-way ANOVA, Tukey's HSD test and Poisson regression were used for statistical analysis (α = 0.05). Significantly improved fracture resistance and predominantly favourable failure modes were found when 2-mm deep IP is prepared.

Comparison of the fracture strength of endodontically treated teeth restored with polyether ether ketone, zirconia and glass‐fibre post‐core systems

“…This study, followed the post diameters given in the literature. Within these limits, although not statistically significant, post diameter was more effective than post length in Group Z unlike Group F and Group P. In a study published in 2019, two different diameters of prefabricated zirconia posts were used, and although the fracture strength of the wide diameter post was high, this difference was not found to be significant 35 …”

“…Within these limits, although not statistically significant, post diameter was more effective than post length in Group Z unlike Group F and Group P. In a study published in 2019, two different diameters of prefabricated zirconia posts were used, and although the fracture strength of the wide diameter post was high, this difference was not found to be significant. 35 Studies investigating the effect of the length of the fibre post on fracture resistance have shown that it does not make a significant difference. [36][37][38][39] However, some studies have reported that the fracture resistance of short glass-fibre posts was significantly higher.…”