Comparing the bonding strengths among three types of intra radical posts using push-out test: Laboratory study

Abstract

Background: One of the major challenges that face any pediatric dentist is restoration the highly dilapidated primary anterior teeth. Conventionally, endodontic treatment must be performed before the restoration procedure. The root canal filling materials tend to prevent the adhesion between the synthetic resin, the restorative material, and dental surfaces. Several studies have confirmed that there are no negative effects of Eugenol on the bonding strength of fibrous posts which have been fixed with resinous compounds. The aim of this study: Evaluating the effect of different materials used in filling the root canal on the bonding strength using three types of posts in the primary anterior teeth.Materials and methods: The sample consisted of 135 extracted anterior canines. Vertical sections were made on the longitudinal axis of the tooth until reaching 1 mm higher than the cementoenamel junction. A complete pulpectomy was performed for all of the sample teeth. the sample was divided into three main groups, each of them contains 45 teeth according to the filling material type, group 1: Metapex, group 2: Zinc oxide and Eugenol paste immediately, Group3: Zinc oxide and Eugenol paste after 1 week, also, three types of posts were used to construct the teeth (short composite posts SCP, glass fiber posts GFP with flow composite, glass fiber posts with risen cement). All teeth were kept in Saline solution before the push-out test was performed by the Mechanical Test Machine. The results were statistically studied with both ANOVA and Bonferroni test. Results: The values of the bonding strength were greater when using METAPEX than when using Zinc oxide and Eugenol paste before and after solidification in all groups of posts, but with significant differences only in the short composite posts group (SCP). Conclusion: The use of zinc oxide and Eugenol paste as a root canal filling material resulted in a clear decrease in the attachment strength values of the various intra radical posts in the primary anterior teeth.